NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES NMBGMR Open File Geologic Map Series OF–GM–24 Map last modified 28 November 2001 MEXICO INSTITUTE OF MINING & TECHNOLOGY NEW MEXICO 68 QHa ? 60000m N. Xiv 35 Qpo 65 89 Qay Xiv85 AM Sanc ? Qpa T. 8 N. 74 af faul af af ˛s Xmv 3 7 t Xqd af 17 54 10 10 79 Xmv QHa 7 Qca 5 QHa Mo n 47 35 Qpm 53 84 Qpm Qpm 62 49 Qpm Xmv Xog 78 AM ECW 002 Xmv 72 62 Qpa Yp Xqv Yd 87 75 32 Qpa Qpa 62 Yd Ya 6 Xla QHa Qpo 65 51 Xqv 84 af ˛m l 78 QHa Yd 76 Yd 65 Qpa 38 Yd 53 Tsp 56 ˛m l 62 Xog 38 56 Qpo1 Xog 46 65 Ya Xog RWP 25 QHa ˛m u Xla Ya Xqv 50' Yd 65 Qpa ˛m l Yd Qpo2 50' Qpo ˛m l 46 af Qpa 38 Xla Yd af ˛m l 74 Xog 83 ˛m l 15 35 6 Qpo Yd Xog Yd ˛m u 20 64 75 Qpm Qpa 38 54 ? QTsp 54 QHa Yd Qpo 25 Xla AM af Xog (LOS LUNAS SE) QTsp Qpa ˛s Yd af Qpa Yd 38 Xog 2 af Qpa Yd 86 Ya Xog 50 6 ll Yd Qpo ll QHa 42 85 82 Xqd Xqg QHa Yp QHa Xqg Xog 58 Xog 57 ll ll Qpa l l QHa ll Xq ˛m l Yd Yp ll ll Xog 64 Yd Xg Qpa ˛m u 90 80 T. 7 N. ˛m l Xq A' Xqg A Xog Qpm ll ll Qpo QTsp QHa ll QHa Xqd ll Qpa Xla ll Yp ll Xgo af ˛m l AM ll Xla Xs ll 80 Xg Xla 65 Xsla 72 72 Yp 82 ˛m l 27' 30" ˛s 3 3 67 68 3 70 B' (CAPILLA PEAK) 0.5 0 213 MILS 0 1000 1 13 MILS 2000 3000 4000 5000 6000 7000 FEET 0.5 0 1 KILOMETER 1 2 1,659 ± 5 Ma 1,659 ± 5 Ma Xqg Xog U-Pb zircon Dan Unruh, unpublished U-Pb zircon Dan Unruh, unpublished 68 Strike and dip of S1 foliation, arrow showing trend and plunge of minor F1 fold axis and fold assymmetry in map view BLL 1 The Bosque Peak quadrangle lies within the southeastern part of the Isleta Indian Reservation and travel within the reservation (northern half of the quadrangle) is restricted. The area is not accessible by public roads; however, several graded dirt and paved roads allow access to portions of the study area. The eastern half lies within the Manzanita and Manzano Mountains and has very limited road access. . Strike and dip of minor dikes and veins Location of radiometrically dated sample Water-supply well INDEX TO GEOLOGIC MAPPING 106° 30' 34°52' 30" BERNALILLO CO. Cañ on d San ISLETA PUEBLO INDIAN RESERVATION Guadelupe Peak Mosca Peak Bosque Peak . Ea r NE W ME X I C O TE C H ry th tu Scie en nce for the 21st C Dr. Peter A. Scholle Director and State Geologist T AT I EMA Dr. Paul W . Bauer Geologic Mapping Program Director Entire Quadrangle Reiche (1949) Myers and McKay (1971) Kelley (1977) Karlstrom, Edwards, Armour, & Lewis Connell & Jackson-Paul Montosa fault B MANZANITA MOUNTAINS e los Sei s 6,000' 5,000' Xg Xog ? Xog Xs 4,000' Xs Xq Xla 3,000' Xog Xog Tld?-˛u Cross sections are constructed based upon the interpretations of the authors made from geologic mapping, and available geophysical (regional gravity and aeromagnetic surveys), and subsurface (drillhole) data. Cross sections should be used as an aid to understanding the general geologic framework of the map area, and not be the sole source of information for use in locating or designing wells, buildings, roads, or other man-made structures. 2,000' Xg Xq Xs 1,000' Xla Yd 0 SL Cañon de los Seis ˛mu 10,000 feet ASL ˛mu ˛ml Xog Xog Xog nyon Ca Bosque + Peak ˛ml Yd Yd 9,000' ˛s Xla Xog Yd 10,000 feet ASL ˛mu ˛ml ˛s ˛s Xog Xla Xdt Xla Xla Xog 8,000' Xp Xp Xmv ˛s 6,000' S ˛mu ˛ml ˛s 8,000' + Mosca Peak B' ˛mu ˛s ˛ml Ojit o Bosque Peak ˛ml 7,000' Guadelupe + Peak Bend in Cross Section B-B' Guadelupe Peak 9,000' d Cany Cross section A–A' Ojito Canyon N ˛mu ISLETA PUEBLO INDIAN RESERVATION Bend in Cross Section B-B' Sand Canyon Xmv . Strike and dip of S2 foliation, arrow showing trend and plunge of lineation Younging determined by unambiguous cross bedding; the longer line represents the truncation surface and stratigraphic top 1 The map has not been reviewed according to New Mexico Bureau of Geology and Mineral Resources standards. Revision of the map is likely because of the on-going nature of work in the region. The contents of the report and map should not be considered final and complete until reviewed and published by the New Mexico Bureau of Geology and Mineral Resources. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the State of New Mexico and the U.S. Government. . S 34 A geologic map displays information on the distribution, nature, orientation and age relationships of rock and deposits and the occurrence of structural features. Geologic and fault contacts are irregular surfaces that form boundaries between different types or ages of units. Data depicted on this geologic quadrangle map are based on reconnaissance field geologic mapping, compilation of published and unpublished work, and photogeologic interpretation. Locations of contacts are not surveyed, but are plotted by interpretation of the position of a given contact onto a topographic base map; therefore, the accuracy of contact locations depends on the scale of mapping and the interpretation of the geologist(s). Any enlargement of this map could cause misunderstanding in the detail of mapping and may result in erroneous interpretations. Site-specific conditions should be verified by detailed surface mapping or subsurface exploration. Topographic and cultural changes associated with recent development may not be shown. rces s ou 75 COMMENTS TO MAP USERS Re 40 Reference W Xq Xla Xog 0 SL NS Method ME X 7,000' Xg TAI Formation l ra 55 Xog Qu Xg Xla Xog Qu Xp Qu Qu 7,000' Xla Xla 6,000' Xog Xog UN Date f Geology and uo Mi ne ea r u ˛ml ˛s 1,000' May 1999 5,000' 5,000' Xmv Xog Xog Xog 4,000' 4,000' 3,000' Xmv 3,000' Yd Yd 2,000' 34°45' 106°22'30" Physiography of the Bosque Peak area based upon 10-m USGS DEM data. Xog Xog Xog Torreon Locality B Overturned bedding Xs Xg 1 Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131 CO Strike and dip of bedding Xla Xg Xs O Approximate location of selected high-resolution aeromagnetic anomaly (from USGS and Sander Geophysics, Ltd., 1998) ˛mu Xla AN AM 34 Xog Tld?-˛u NZ Andalusite isograd 8,000' Xog 2,000' MA usite Andal ˛mu ite . Xs lus Overturned syncline— trace of axial plane showing direction of plunge; dashed where approximately located ˛mu Xq da . ˛s Xla Yd An Overturned anticline —trace of axial plane showing direction of plunge; dashed where approximately located ˛s Xog Xq ? on Syncline— trace of axial plane showing direction of plunge; dashed where approximately located, dotted where concealed, queried where inferred 9,000' ˛s Xg Cañon de Fault trace—inferred from degraded topographic scarp ˛ml 3,000' MO Reverse fault—showing dip, arrow shows trend and plunge of slickensides; teeth on upthrown side of hanging wall block (combination of reverse fault teeth and bar-and-ball indicates interpretation of normal reactivation of a reverse fault); solid where exposed; dashed where approximately located; dotted where concealed 30 E. 10,000 feet ASL 2 New Mexico Bureau of Geology and Mineral Resources, Socorro, NM 87801, Albuquerque Office, 87106 Normal fault—showing dip, arrow shows trend and plunge of slickenlines; solid where exposed; dashed where approximately located; dotted where concealed; ball-and-bar on downthrown side Anticline — trace of axial plane showing direction of plunge; dashed where approximately located, dotted where concealed, queried where inferred •• 73 000m Table of Geochronologic Samples Fault trace—inferred from a vegetation lineament •• 3 E ˛s ? Tsp 34° 45' 106° 22' 30" A' Cañon de Tajique ˛ml Tld? 4,000' 42 by Karl E. Karlstrom 1 , Sean D. Connell 2 , Duncan L. Edwards 1 , Jake Armour 1 , John Lewis 1 , and Patricia Jackson-Paul 2 P ll ll ll ll ˛s Xs 72 QUADRANGLE LOCATION NE ll NEW MEXICO Mapping of this quadrangle was funded by a matching-funds grant from the 1997 STATEMAP program of the National Geologic Mapping Act coordinated by the U.S. Geological Survey and the New Mexico Bureau of Geology and Mineral Resources (Dr. Peter A. Scholle, Director and State Geologist; Dr. Paul W. Bauer, Geologic Mapping Program Manager). New Me xic o •• Cerro Blanco Xs 5,000' Geology of Bosque Peak quadrangle, Valencia, Torrance, and Bernalillo Counties, New Mexico 1 MILE ˛s Xog Xog Tsp 3 71 Xg NATIONAL GEODETIC VERTICAL DATUM OF 1929 Geologic contact—solid where exposed, dashed where approximately located, dotted where concealed, queried where inferred 60 70 Manzano Crest N) 1000 E XPLANATION OF M AP S YMBOLS 50 25' 12° Location of geologic cross section Xsla Xdt ˛ml EO RR 1 UTM GRID AND 1976 MAGNETIC NORTH DECLINATION AT CENTER OF SHEET 45 3 GN 0° 45' Xla Tsp Qu QHa ˛m l 60 74 SCALE 1:24,000 MN Paleoproterozoic ˛mu Xog Qu ˛s Xsla 76 45 42 ˛m u Xs Xla 63 D. J. McCraw and G. E. Jones: digital cartographic production •• ˛m l Xsla R. 5 E. Xq Xc 12 ˛s te lusi Anda 72 6,000' Xsla Xsla 52 47000m N. O (T Base from U.S. Geological Survey 1951, photorevised 1991 Universal Transverse Mercator projection, 1983 North American datum, 2,500-m grid based on New Mexico coordinate system, cental zone 1000-meter Universal Transverse Mercator grid ticks, zone 13, shown in blue Xsla Xsla Qpm R. 4 E. Xs VALENCIA CO. TORRANCE CO. 430 000 FEET ˛m l 38 VALENCIA CO. TORRANCE CO. 64 3 Xog Xsla 89 3 Xs Xp ˛s 9,000' ˛s CONTOUR INTERVAL 40 FEET A' Xgo Xg ˛ml 7,000' 60 Xla 40 ? 63 48 70 Xsla 75 10 72 K. E. Karlstrom: Proterozoic mapping, Phanerozoic stratigraphy, unit descriptions, and correlations, regional structural interpretation, structural cross sections; J. Armour and J. Lewis: Paleozoic mapping; S. D. Connell and P. Jackson-Paul: Quaternary mapping and unit descriptions A Xqg ˛mu 8,000' Xog 62 3 Xog Xqd Montosa fault 68 20 Xla AM O (T 38 21 38 M ˛s ˛s Qpm ) A 55 Yd 30 ? Ya Xmv Cross section B–B' 8,366' Monzano fault 10,000 feet ASL Xog ? Qpo Yp ~1600 G EOLOGIC C ROSS S ECTIONS 24 72 Qpo Yd U.S. Geological Survey, and Sander Geophysics, Ltd., 1998, Digital data from the Isleta-Kirtland aeromagnetic survey, collected south of Albuquerque, New Mexico: U.S. Geological Survey Open-File Report 98-341, CD-ROM. 60 ll af ? NE 40 Qpo ll ? ˛s Thomas, E., Van Hart, D., McKitrick, S., Gillentine, J., Hitchcock, C., Kelson, K., Noller, J., and Sawyer, T., 1995, Conceptual geologic model of the Sandia National Laboratories and Kirtland Airforce Base: Technical Report, Site-Wide Hydrogeologic Characterization Project Organization 7584, Environmental Restoration Program. Prepared by GRAM, Incorporated, Albuquerque, New Mexico; and William Lettis and Associates, Oakland, California, Section 2 and Appendix D. 45 12 Xla ? ˛m l Pennsylvanian Mesoproterozoic (?) Reiche, P., 1949, Geology of the Manzanita and north Manzano Mountains, New Mexico: Geological Society of America Bulletin, v. 60, no.7, p. 1183–1212. 5 ˛mu ll ? ˛m ~900 Parchman, M. A., 1981, Precambrian geology of the Hell Canyon area, Manzano Mountains, New Mexico: unpublished MS thesis,University of New Mexico, 108 p. 49 Xog ? ˛m u 323 Osburn, G. R., and Chapin, C. E., 1983, Nomenclature for Cenozoic rocks of northeast Mogollon-Datil volcanic field, New Mexico: New Mexico Bureau of Mines and Mineral Resources Stratigraphic Chart 1. 18 45 QTsp Qpa ? Permian 31 Xla Xla ? E 38 5 ? 47 290 W ? 34° 45' 106° 30' 10 QTsp 1 370 000 FEET BLL1 248 Myers, D. A., and McKay, E. J., 1971, Geologic map of the Bosque Peak quadrangle, Torrance, Valencia, and Bernalillo counties, New Mexico: U.S. Geological Survey Miscellaneous Investigations Series Map I-948. 9 9 Qpo 48 Tld?-˛u Xiv 5 ˛s Xog Xgo 38 Tld? 10 Ya af ? Xla Xg QTsp ? Myers, D. A., 1973, The upper Paleozoic Madera Group in the Manzano Mountains, New Mexico: U.S. Geological Survey Bulletin 1372-F, 13 p. 85 nto ˛s Xg Miocene ˛m l ˛m l Mo ˛m l Qpa 5.3 ˛m u 33 15 sa ll Xg Tsp ˛s 59 ll 49 Qpa 4 Xq 38 QTp 14 Xog Xg 30 31 15 67 70 78 87 ll QHa 10 80 Xs Yd Yd Xgo ll Qpa Xq Ya ? 1.8 Love, D. L. (compiler), et al., 1996, Geology of the Hubbell Springs 7.5-minute quadrangle, Bernalillo and Valencia Counties, New Mexico: New Mexico Bureau of Mines and Mineral Resources Open-File Report 426. Aplite and granite dikes — Light gray to pink muscovite-bearing granite, aplite, or pegmatite, post-dates foliation in country rock and may be ca. 1.4 Ga. Ya 80 Xog Xg Yp 76 ˛s Xla Xqg 73 Xs 60 Xgo ll ll Xla T. 6 N. f au l t 55 ? Lozinsky, R. P., 1994, Cenozoic stratigraphy, sandstone petrology, and depositional history of the Albuquerque Basin, central New Mexico: in: Keller, G. R.,and Cather, S. M., eds., Basins of the Rio Grande Rift: Structure, Stratigraphy, and Tectonic Setting: Geological Society of America Special Paper 291, p. 73-82. Diabase dikes — Dark green to black basaltic and diabasic dike composed of labradorite, augite, epidote, chlorite, magnetite, and sphene. Chilled margins are very fine grained basalt; dike cores are typical diabase texture consisting of randomly oriented plagioclase laths in matrix dominated by pyroxene. Dikes are pre-Pennsylvanian and are inferred to be 1.1 Ga based on chilled margins and regional correlations. Pegmatite dikes — Dikes, pods, and lenses ranging from <1 in. up to >50 ft (<3 cm to >15 m) in thickness. Dikes are undated but cross cut foliation and may be ca. 1.4 Ga. . Yd 68 QHa T. 7 N. Qpa 0.78 Lozinsky, R. P., 1988, Stratigraphy, Sedimentology, and Sand Petrography of the Santa Fe Group and Pre-Santa Fe Tertiary Deposits in the Albuquerque Basin, Central New Mexico: unpublished Ph. D. dissertation, New Mexico Institute of Mining and Technology, 298 p. Mesoproterozoic 75 ˛s Xla ˛s Xla Qpo Karlstrom, K. E., Connell, S. D., Ferguson, C. A., Read, A. S., Osburn, G. R., Kirby, E., Abbott, J., Hitchcock, C., Kelson, K., Noller, J., Sawyer, T., Ralser, S., Love, D. W., Nyman, M., and Bauer, P. W., 1994, Geology of the Tijeras quadrangle, Bernalillo County, New Mexico: New Mexico Bureau of Mines and Mineral Resources, Open-file Geologic Map OF-GM 4, scale 1:24,000. . PROTEROZOIC ROCKS Xs Xla ll Qpo T. 6 N. Karlstrom, K. E., Chamberlin, R. C., Connell, S. D., Brown, C., Nyman, M., Cavin, W., Parchman, M., Cook, C., and Sterling, J., 1997, Geology of the Mt. Washington 7.5-minute quadrangle, Bernalillo and Valencia Counties, New Mexico: New Mexico Bureau of Mines and Mineral Resources Open-File Geologic Map 8, scale 1:24,000. QHa 52 Yd Qpa Connolly, J. R., 1981, Geology of the Precambrian rocks of Tijeras Canyon, Bernalillo County, New Mexico: unpublished MS thesis, University of New Mexico, 147 p. Upper to middle Pennsylvanian 14 Ya ll Qpa 51 47' 30" 75 60 ll ll ll Qpo 78 Yp Xg QTsp ll 38 Xs Xog Ya 75 70 Xla 45 Yd ll ll QHa Yd Ya ˛s 33 77 Yd ˛m l 41 Xog Xog ll 76 45 77 65 84 Yp ll 4 55 77 44 Qpa Qpm 48 70 Yd Yd Xog Qpa 60? 51 QHa 55 QHa 81 Yd 52 ˛m u 84 45 Xs Qpm Qpa 9 Ya Yd Qpa 47' 30" ˛s Xog Qpo 38 35 65 ll QHa af Xla Xog Yd ll 52 QHa 43 35 Qpm Qu Connell, S. D., Cather, S. M., Ilg, B., Karlstrom, K. E., Menne, B., Picha, M., Andronicos, C., Read, A. S., Bauer, P. W., and Johnson, P. S., 1995, Geology of the Placitas 7.5-minute quadrangle, Sandoval County, New Mexico: New Mexico Bureau of Mines and Mineral Resources Open-File Geologic Map 2, scale 1:24,000. . Madera Formation, lower cherty fossiliferous limestone unit — Mostly cliff-forming, gray fossiliferous limestone with minor interbedded shales and quartzose to feldspathic sandstones and conglomeratic sandstones. Individual massive to nodular limestone beds are commonly 20–30 ft (3–9 m) thick and may be as much as 60 ft (18 m) thick. Irregular masses of black to reddish orange chert are common in massive limestone beds. Nodular limestones often weather to mottled gray and brown surfaces. Limestones are interbedded with light to dark gray and yellowish brown shales, nodular shales and yellowish brown to greenish gray siltstones that are often micaceous. Siltstones locally grade upward into lenticular to tabular quartz arenites and quartz pebble conglomerates of light gray to yellowish brown color. Clastic units locally contain silicified wood. Includes Los Moyos Limestone and overlying Sol se Mete Member of Wild Cow Formation of Myers (1973), ˛orml and ˛mub of Myers and McKay (1970). These mostly cliff forming units are often separated by a gentle slope break (or breaks), but otherwise appear to be lithologically similar. Additional study of the Wild Cow/Los Moyos contact and its lithologic mapability seems warranted. Approximate thickness 500 to 800 ft (150–240 m). Sandia Formation — Mostly slope-forming shales and siltstones grading down into basal quartz pebble conglomerates and up into thin bedded limestones. Limestones and shales occur in uppermost 20 ft (7 m) near gradational contact into overlying cliffforming limestones of Madera Formation. Well indurated (siliceous) basal quartz pebble conglomerates are thickest (20–40 ft; 6–12 m) in northwestern third of quadrangle and generally thin to low ledge-forming conglomerates (1–2 m thick) and sandstones in southeast quadrant. Sparse metamorphic and limestone pebbles or shell fragments are locally present in thinner (lower energy?) basal zones. Light gray to yellowish brown conglomerates of basal zone grade upward into yellowish brown, gray and greenish gray sandstones and micaceous siltstones interbedded with yellowish brown, gray and black shales or carbonaceous shales. Medial shaley zone is 100–150 ft (30–45 m) thick and commonly mantled with blocky limestone colluvium (generally not mapped) derived from overlying Madera Formation. ˛m l 55 Xqg Qpm Qpa Yd Ya Xog 0.13 Cavin, W. J., 1985, Precambrian geology of the Manzanita Mountains, Bernalillo County, New Mexico [M.S. thesis]: Albuquerque, University of New Mexico, 144 p. Edwards, D. L., 1978, Petrology and structure of Precambrian rocks in the Bosque Peak quadrangle, north Manzano Mountains, central New Mexico: unpublished MS thesis, University of New Mexico, 105 p. . Yd Qca 65 Madera Formation, upper arkosic unit — Interbedded arkosic conglomeratic sandstone, sandstone, siltstone, mudstone and limestone; mostly slope to ledge forming. Yellowish to reddish brown and light gray arkosic to feldspathic sandstones and conglomeratic sandstones are lenticular and grade into pale yellow brown, gray and purplish gray mudstones and micaceous siltstones. Clastic units locally contain silicified wood. Tabular, ledge-forming, light to dark gray, fossiliferous, limestones are commonly interbedded with mudstones and may locally contain feldspathic detritus. Red muddy soils are common on the upper arkosic member. Generally equivalent to Pine Shadow and La Casa Members of Wild Cow Formation of Myers (1973) or ˛muc and ˛mud of Myers and McKay (1970). As much as 400 ft (120 m) thick, with erosional top. Xog QHa 38 53 Xog 65 1 Qay Bachman, G. O., and Mehnert, H. H., 1978, New K-Ar dates and the late Pliocene to Holocene geomorphic history of the central Rio Grande region, New Mexico: Geological Society of America Bulletin, v. 89, p. 283-292. Upper Pennsylvanian to lower Permian (?) ˛mu af 0.01 R EFERENCES PALEOZOIC ROCKS ˛m u Basin Fill & Other QHa Holocene 40 ˛m l 53 Qpa ˛m l 65 38 af 45 51 Xog (TAJIQUE) Qpo Qpa 30 Piedmont Slope Paleogene ˛s ˛m l Valley Floor 0 Ma 23.7 La Jara Peak basaltic andesite (?) / Datil Group (?), Triassic, Permian and Pennsylvanian rocks, undivided — (Cross section A-A' only) Undivided Tld(?), ˛mu, ˛ml, ˛s, Permian (probably Glorieta Sandstone, San Andres, Yeso, and Abo Fms.) and Triassic (probably Moenkopi Fm. and Chinle Group) rocks buried beneath the piedmont of the Manzano Mountains. The lower 991 ft (302 m) of the Cenozoic section of the Grober-Fuqua No. 1 well, described above, contains light reddish-brown clay, silty sandstone, and sandstone that is slightly different than the overlying deposits (Lozinsky, 1988) may be correlative to Tld(?). Thickness of the pre-Cenozoic portion of this unit, as extrapolated from the northern Sandia Mountains at Placitas (Connell, et al., 1995) is about 4,900 ft (1,494 m). The Cenozoic part of this unit is 991 ft (302 m) to at least 1,150 ft (350 m). . Tld?-˛u 38 Yd QTsp Xmv C ORRELATION OF U NITS Quartz veins — Veins and veinlets of massive, milky-white quartz generally parallel to the regional fabric although smaller veinlets (2-5 cm) locally cross cut the fabric. In some locations, thin quartz veinlets are folded with the main fabric as axial plane. Mappable quartz veins consist of white quartz with minor hematite and brown calcite. . Ojito granite — Medium grained massive quartz monzonite composed of quartz, sodic andesine, microcline, biotite, and accessory hornblende, sphene, epidote, apatite, and tourmailine; U-Pb zircon date of 1,659 ±5 Ma. Comingled with mafic units Xqd, Xqg, and Xgo, and Xg. Porphyritic quartz diorite — Porphyritic rock composed of hornblende and plagioclase phenocrysts in a medium grained groundmass of quartz, andesine, hornblende, biotite, and accessory chlorite, opaques, and apatite; gradational with other mafic units and the Ojito pluton because of magma mingling and mixing. Quartz gabbro — Medium grained rock composed of quartz, labradorite, hornblende, and accessory chlorite, epidote, biotite, opaques, and apatite. Occurs as large intrusive masses and as mafic enclaves in the Ojito granite; gradational with other mafic units. Olivine gabbro — Medium grained gabbro containing labradorite (locally sericitized), biotite, hornblende (after pyroxene), hypersthene, augite, and olivine, with accessory opaques, apatite, muscovite, antigorite, quartz, calcite, and chlorite. . Gabbro and diorite undivided — Mafic plutonic rocks undivided: quartz diorite, quartz gabbro, olivine gabbro, often as enclaves and variably mingled with Ojito granite. Schist and phyllite — Mottled quartz-rich schist and phyllite with red, hematitic and green fuchsite-rich (?) zones that occurs as discontinuous layers of variable thickness. Schistosity is variably injected with lense-shaped quartz pods. Parent rocks for the schist probably consisted of impure quartzrich siltstones. This unit may correlate with the Coyote Schist and Coyote Phyllite of Cavin (1985), and with Blue Springs schist of Reiche (1949); occurs both above and below Xq. Massive to thickly-bedded, gray- to milky white quartzite — Original bedding in the quartzite consists of 1-5 mm-thick black and red hematiterich layers. Cross bedding is locally preserved. Interlayered with the quartzite are greenish-gray micaceous quartzite that contain up to 35% muscovite and chlorite. Protolith for the thickly bedded quartzite was pure quartzose sands intermixed with impure sandstones and siltstones. Correlates with the Cerro Pelon and Coyote quartzites of Cavin (1985) and Sais Quartzite. Lithic arenite — This rock unit consists of a variety of metasedimentary rocks including metawacke, meta-arkose and impure metaquartzite. Up to 50% of this unit is a brown weathered impure arkosic metaquartzite with light green to gray fresh surfaces. Schistosity is variably developed throughout most of the unit. Compositional layering (S0) is commonly preserved and is generally at low angles to the dominant schistosity (S1). Metamorphic grade and field appearance of this unit varies towards the Ojito granite, indicating development of a contact aureole associated with granite emplacement. Away from the Ojito granite metasedimentary rocks have a granular appearance with a weak foliation. Samples of metasediments near the Ojito granite are granoblastic schists with porphyroblasts of sillimanite, andalusite, and chloritoid. Includes the Bosque and Moyas metasedimentary units of Edwards (1978; interpreted here to be correlative) and the Lower Metaclastic series of Reiche (1949). Includes siliceous lithic arenite lenses that form resistent outcrops (Xsla). Phyllite and schist — This rock unit is interlayered and gradational with the lithic arenite but has been mapped as a separate unit in several zones where it constitutes greater than 90% of the exposure. This unit also occurs in the mafic metavolcanic rock unit (Xmv) and the lithic arenitie unit (Xla) as <5 m thick beds that were too small to map as individual units. This unit consists of blue to light grayish green phyllite that become more schistose and massive (high grade) in exposures closer to the Manzanita granite. Parent rocks for this lithology were siltstones. Metachert and jasperoid — Metachert occurs as prominent, low-lying outcrops infolded and interlayered with the metasedimentary and blue phyllite unit. These layers range from several cm to m thickness and are discontinuous along strike frequently pinching off within phyllitic layers or adjacent to chlorite-rich amphibolites. This unit varies from white to hematite-stained quartz-rich sediment with narrow micaceous zones parallel to local foliation. Jasperoids consist of red-stained, discontinuous pods of jasper. This unit marks the transition from volcanic to clastic deposition. Dacite tuff — The metatuff unit is gray to light grayish green dacite with a well-developed schistosity. Major parts of this unit contains flattened ovoid shaped fragments of light gray to buff phyllite, chlorite phyllite, metaquartzite and greenstone. These fragments range in size from 1.5 to 12 in (4 to 30 cm) and are aligned parallel with the schistosity. Towards the gradational contact with the metasedimentary unit the metatuff contains abundant (up to 80%) blue to blue-gray phyllite fragments. The matrix of the metatuff is fine grained, gray to greenish gray. The metatuff is interpreted to be the metamorphic equivalent of a crystal and vitric-crystal tuff that is dominantly dacite with minor andesite. Includes the Lacorocah metatuff of Parchman (1980). . Intermediate metavolcanics rocks — Buff, schistose bands intimately interfingered with the greenstone (Xmv) and metatuff (Xdt) units. This unit also defines broad, regional folds. Lithologies within this unit consists of a mixture of volcaniclastic rocks including quartz-mica phyllites and volcanic rocks with an andesitic composition (Parchman, 1980). In outcrop this unit has a brown to graygreen color with a moderately well-developed schistosity. Mafic metavolcanic rocks — Heterogeneous metavolcanic unit composed of basaltic greenstones, intermediate volcanics, volcaniclastic greenschists (quartz-actinolite-chlorite schists) and metapelites. Rare epidote-rich bands are present in some areas and may denote margins of metamorphosed pillows. Other primary features include compositional layering defined by white, plagioclase(?)-rich layers that are parallel to foliation and plagioclase-phenocrystic volcanic rocks. Unit grades upwards to volcaniclastic rocks (Xdt) and may be interlayered with mappable units of felsic to intermediate volcanic rocks (Xiv), volcanic breccias, dacite breccia (Xdt), chert (Xc) and fine grained phyllite (Xp). Unit correlates with Coyote greenstone and Isleta greenstone of Cavin (1985) the lower part of Tijeras greenstone of Connolly (1981), greenstone complex of Reiche (1949), and unnamed greenstone of Edwards (1978). 86 57 Qpo Xiv La Jara Peak basaltic andesite (?) and Datil Group (?), undivided — (Cross section A-A' only) Light-gray to reddish-brown and orange welded tuff, sandstone, and siltstone encountered in the Aguayo-Comanche No. 1 well described above. Base of Tld? was not encountered in this well. Exposures of moderately tilted volcaniclastic deposits near the mouth of Trigo Canyon, Capilla Peak quadrangle, containa basaltic lava flow (Lozinsky, 1988) that has an 40Ar/39Ar date of 26.20 ± 0.18 Ma (W. C. Macintosh, 2000, personal communication; NMBGRL No. 51633). This date is considerably older than a K/Ar date of about 21 Ma for this flow (Bachman and Mehnert, 1978). The revised date is similar to the top of the La Jara Peak basaltic andesite of Osburn and Chapin (1983). Although the stratigraphic position of this flow relative to the Aguayo-Comanche No. 1 is not known, the considerable thickness of volcaniclastic sediment encountered in the well and the 26 Ma date for similar exposures in Trigo Canyon suggest that these are pre-Santa Fe Group deposits. Unit is more than 1,150 ft (350 m) thick. . Tld? Xla af Xdt NEOGENE - MESOZOIC - UPPER PALEOZOIC ROCKS 55 54 Yd RWP 002 Xp QTsp Qpo2 55 ˛m u 79 Qpa 38 Xsla Piedmont alluvium (upper Pliocene(?) to lower Pleistocene) — Poorly sorted, calcium-carbonate cemented, clast supported cobble to boulder conglomerate commonly found on the footwall of the range-bounding faults. Clasts are dominantly granite, phyllite, greenstone. Minor limestone is present in alluvial fans derived from major drainages (i.e., Ojito, Garcia, Sand, Cañon de los Seis, Cañon de los Moyos, and White Rock Canyons). Clasts are commonly highly split, deeply pitted and weathered and grussified. Sand is composed mostly of grussified Ojito granite. Deposit surface is moderately dissected and locally exposes partially stripped soils with stage III to IV carbonate morphology. Base not exposed; estimated thickness is >14 ft (>4 m). Piedmont alluvium (lower Pleistocene(?) to Miocene) — Poorly to moderately sorted, well consolidated, calcium-carbonate cemented conglomerate and sandstone exposed on the footwall of the Hubbell Springs fault. Unit is not exposed in the study area and is shown only in cross section A-A'. Deposits are described to about 620 ft (180 m) in well BLL1. Conglomerate is clast supported and contains abundant granite, metamorphic and minor limestone. North or the study area, the Santa Fe Group rests unconformably on upper Paleozoic, Triassic, and lower Tertiary deposits (Love et al., 1996; Karlstrom et al., 1997; Thomas et al., 1995). About 6 mi (9.5 km) south of cross section A-A' on the adjacent the Capilla Peak quadrangle, an oil test well (Leroy Bennett AguayoComanche No. 1, T6N, R5E, Sec. 31; NMBGRL No. 11,695) encountered “Quaternary pediment gravels and sands” (upper Santa Fe Group) to a depth of 505 ft (150 m), overlying tentatively assigned La Jara Peak basaltic andesite and tuff-bearing Datil Group deposits (Tld?) to 1,655 ft (505 m). No pre-Tertiary rocks were reported in the log. Unpublished gravity modeling (V.J.S. Grauch, 1999) suggests that Mesozoic and older rocks may be approximately 2-2.4 mi (1.25-1.5 km) below the ground surface and the Grober-Fuqua No.1 oil test well, drilled about 14 mi (22.5 km) south-southwest of cross section A-A', encounters Triassic sediments at a depth of 4,550 ft (1,384 m)(Lozinsky, 1994). . QTsp af 56 Xla Xc ˛m u Ya Xog QHa Xq Santa Fe Group 7 Yd Qpm Qpa Ya 70 Yd af af Xs 84 Xog QHa Xg Xdt 66 Xqv 66 66 1 400 000 FEET ˛s Xc 65 Ya Qpo Xp Yd 38 48 70 40 Xp Xdt Xc 55 53 Xog Xgo Arroyo Comanche #1 (projected) 57 AM QHa 38 62 48 38 QHa QHa Xqd Xqv ˛m l ˛m l 85 22 Qpm Xp Xmv 80 48 73 20 45 66 83 Xog Xla ˛s 75 57 Qpa 37 64 36 Xqd 58 Xmv Yp Xla Yd 38 66 78 Xp 43 Qpa 81 52 46 Xqv 30 ˛s 65 40 Xqg Piedmont alluvium, undivided (upper Pliocene to Quaternary) — Undivided piedmont units (Qpa, Qpm, Qpo, and QTp) shown in Cross Section A-A'. Piedmont alluvium, undivided (Holocene to lower Pleistocene) — Poorly to moderately sorted, moderately consolidated pebble and cobble conglomerate and pebbly sand. Soil development is variable typically possesses multiple (cumulic) buried soils with Bk horizons that exhibit stage II and IV calcium-carbonate morphology. The unit forms a complex of piedmont and valleyfloor deposits that marks local base level for mountain front drainages. Unit contains slightly to moderately dissected valley-floor deposits and terraces inset against unit Qpo. Unit is locally mantled by QHa and Qay in narrow to broad swales. Forms constructional surface of the Llano de Manzano piedmont slope. Estimated thickness is <14 ft (<4 m). Piedmont alluvium (middle Pleistocene) — Poorly sorted, moderately consolidated pebble to cobble conglomerate and pebbly sand. Soil development is variable and typically possesses multiple (cumulic) buried soils with Bk horizons that exhibit stage II and III calcium-carbonate morphology. The unit forms slightly to moderately dissected valley-floor deposits and terraces inset against unit Qpo. Unit is locally mantled by Qay in narrow to broad swales. Base not exposed; estimated thickness is >14 ft (>4 m). Piedmont alluvium, undivided (lower to middle Pleistocene) — Poorly sorted, poorly to moderately consolidated and calcium carbonate cemented sand and subrounded to subangular cobble to pebble conglomerate inset against unit QTp. Unit is locally differentiated into two subunits (Qpo1, older; Qpo2, younger) on the basis of inset relationships. Soils are partially stripped, but locally exhibit stage III to IV carbonate morphology. Base not exposed; estimated thickness is >14 ft (>4 m). Qu Xmv Xp 57 69 Qpo Xqd Piedmont-slope alluvial deposits ˛m u Xmv 12 t Xmv 60 QHa ul ˛s Xp Xmv Xp 68 71 56 60 Xla Ya fa 58 Ya Qay1 Xog 15 78 49 Xqd ˛m l QHa 26 64 75 Xla Qay2 57 5 11 Xp Xmv ˛m l 70 sa ˛m l 54 68 to Xmv 20 12 63 Xqd ˛s 4 Xmv Qpm 59 Qay 60 10 Qay1 Qpm QHa 38 6 ˛s Qpa 58 QHa Xp 30 5 38 5 Xmv 8 12 11 QHa Qpa 71 37 8 Xqd 59 73 ˛m l 11 Qay2 39 Qca T. 7 N. 27 ˛m l 10 5 Xdt Qay1 32 ˛s 63 Qay2 Qay1 af ˛s QHa 66 Xqd Xmv ? QHa Qpa T. 8 N. 5 80 Artificial fill (Historic) — Dumped fill and areas affected by human disturbances. Alluvium and colluvium, undivided (Holocene to late Pleistocene) — Poorly consolidated, poorly sorted and stratified, fineto coarse-grained, clast- and matrix-supported deposits derived from a variety of mass-movement hill-slope processes, including debris flow, shallow slump and creep. Clasts are typically angular and composition generally reflects local provenance. Colluvium is common on hillslopes, but is differentiated where areally extensive. From 3 to 20 ft (<1 to 6 m) thick. . Stream alluvium, undivided (Holocene to Historic) — Poorly to moderately sorted, poorly consolidated pebble- to cobble conglomerate and fine-to coarse-grained sand with local accumulations of cobbles and small boulders as much as 2.5 mi (4 km) west of the mountain front. Units commonly form narrow to broad streams with elongate cobble and boulder bars and floodplains that are inset against Qay and Qpa. Bar and swale topography is well developed. Soils are very weakly developed and possess disseminated to no pedogenic carbonate. Estimated thickness is 3 to 14 ft (<1 m to 4 m). Stream alluvium, undivided (upper Pleistocene to Holocene) — Poorly to moderately sorted, poorly consolidated light-brown and light reddish-brown to gray-brown pebble and cobble conglomerate and sand with minor accumulations of boulders and siltto clay-rich beds. Clasts are subangular to subrounded and typically not weathered nor pitted. Unit forms terraces inset against unit Qpa. Bar and swale topography is locally well developed. Terrace tread lies < 16 ft (<5 m) above modern streams. Estimated thickness is <14 ft (<4 m). af 9 Qca Xmv Paleoproterozoic Xqv ˛m l 6 15 5 60 ˛m l Xmv 4 CENOZOIC SEDIMENTS Anthropogenic, colluvial, and stream alluvial deposits 34° 52' 30" 38 72 80 74 106° 22' 30" 3 460 000 FEET 8 ˛m l Qay 86 QHa Qca ˛s 70 75 Qpa Qay 72 70 73000m E. 8 66 Xmv Xqd 3 72 74 Qpo Qpo hez 3 ˛s QHa 79 76 Xmv B Xmv Qca 60 68 86 Qpa 80 Xiv QHa Qay Qpm 70 Qay Qpa 25' 3 69 Xmv 38 T. 7 N. 3 (MOUNT WASHINGTON) late 3 middle 67 early 3 27' 30" R. 5 E. late R. 4 E. early Qpm 66 Pleistocene 3 65 Pliocene 3 Qay CENOZOIC 64000m E. MESOZOIC 3 SC (E PALEOZOIC 106° 30' 34° 52' 30" U NIT D ESCRIPTIONS ) SA O AB PROTEROZOIC LL BE G) UB IN (H SPR BOSQUE PEAK QUADRANGLE BLL1 (projected) A DIVISION OF NEW Yd 2,000' Yd Xla 1,000' 1,000' Xmv Yd 0 SL Xla 0 SL