Field Geology Course – Part Two Evolution of Ancient Seas, Tropical Reefs, and Life in the Nanpanjiang Basin of Guizhou South China Dan Lehrmann University of Wisconsin, Oshkosh Wan Yang Wichita State University Yu YouYi Guizhou University Department of Geology, University of Wisconsin, Oshkosh, Wisconsin Department of Geology, Wichita State University, Wichita, Kansas May, 2009 Table of Contents Table of contents …………………………………………………………………. List of course participants ……………………………………………………… Itinerary …………………………………………………………………………… Syllabi .................................................................................................................... Preface ................................................................................................................…. I II III VII IX ……………………………………………………….. 1 General geology of China Triassic depositional history of the Yangtze platform and Great Bank of Guizhou and accompanying field guide for geological traverses in the Nanpanjiang Basin of south China………………………………………………………………………… ……..9 Geological descriptions of field stops Leg 1 – Great Bank of Guizhou (GBG) ………………………………………..….. 43 Stop 1. NPJ basin overview. Yangtze platform architecture in Guiyang area…... 43 Stop 2. Nanpanjiang basin turbidites, Overview southern margin GBG……….. 48 Stop 3. Overview of Bianyang syncline and northern margin escarpment………………………………………..…………………………… 50 Stop 4. P-T and Lower Triassic sections at Dawen and Dajiang ……………… 52 Stop 5. Basin margin slope traverse at Guandao ……………………………… 60 Stop 6. Northern reef margin traverse south of Guandao ………………............. 70 Stop 7. Platform interior traverse at Dajiang ………………………………… 73 Stop 8. Termination (drowning) sequence ……………………………………… 74 Stop 9. Ladinian patch reefs along the southern escarpment at Bangeng……… 76 Stop 10. Southern Reef margin and karst features at Dajing…………………… 76 Leg 2 –Yangtze Platform……………………………………………………………. 80 Stop 1. Karst features at Zhijin cave complex ………………………………… 98 Stop 2. Huanguoshu waterfall and overview of Yangtze Platform……………. 100 Stop 3. Platform margin (basin to interior) traverse at Hongyan………………. 102 Stop 4. Architecture of the Platform margin at Dabang….……………………. 113 Stop 5. Platform interior traverse at Yongingzhen…………………………….. 116 Stop 6. Crinoid and marine reptile lagerstätte at Xinpu………………………...118 Stop 7. Xingyi; Malinghe gorge plus Guizhousaurus lagerstätte……………… 124 Stop 8. Zhenfeng platform margin traverse: tectonic controls………………… 128 Stop 9. Cyclostratigraphy and sequence stratigraphy at Beila…………………. 135 Stop 10. Post termination fluvial formations at Longchan…………………….. 138 . I List of Course Participants From University of Wisconsin, Oshkosh, U.S.A.: Dr. Dan Lehrmann (co-instructor) Students to be listed. Wichita State University, Wichita, Kansas, U.S.A.: Dr. Wan Yang, co-instructor Students to be listed. From Guizhou University Professor Yu Youyi, co-instructor Students to be listed. II Itinerary June 11 (Tuesday), depart U.S. (flight to Beijing, domestic flight to Guiyang) June 12 (Wednesday) Arrive Guiyang. Overnight at: Jinri hotel, Beijing Road, Guiyang; phone: 86-851-6891600 June 13 (Thursday). Morning recovery from jet lag. Afternoon Tour of Guiyang Huaxi Park and other attractions and geologic stops surrounding Guiyang. Triassic Yangtze platform margin at Longtou Fm.-Qinyang Guiyang-Mongguan-(Jurassic)-.Huaxi park. Dinner at Miao restaurant in evening. Overnight at: Jinri hotel, Beijing Road, Guiyang; phone: 86-851-6891600 June 14 (Friday) Morning lectures on regional Geology of Guizhou., at Guizhou University. Afternoon field preparation Dinner at dumpling house. Overnight at: Jinri hotel, Beijing Road, Guiyang; phone: 86-851-6891600 Geological Field Traverse Leg 1 – Great Bank of Guizhou June 15 (Saturday) Morning Drive to Great Bank of Guizhou. Examination of Yangtze Margin architecture in Guiyang syncline (Gutang). Overview stops in Bianyang Syncline to view and discuss Nanpanjiang Basin and Great Bank of Guizhou. Overnight at: Shen Quan Hotel, Luodian; phone: 86-854-7620880 June 16 (Sunday) Morning Overview stop on southern Margin of Great Bank of Guizhou. Examination of Basin Filling Turbidite Deposits of Bianyang Fm. Permian Triassic boundary and Lower Triassic sections (Dawen, Heping, Dajiang, Langbai) Overnight at: Shen Quan Hotel, Luodian; phone: 86-854-7620880 June 17 (Monday) Morning Basin Margin Traverse and section measuring exercises. Guandao section. Escarpment and breccia apron. Afternoon: Platform margin Reef Traverse (Northern margin of Great Bank of Guizhou). Overnight at: Shen Quan Hotel, Luodian; phone: 86-854-7620880 June 18 (Tuesday) Platform interior traverse Dajiang section. Afternoon – drowning section termination of the platform in Bianyang syncline, visit village town of Bangun and examine Ladinian patch reefs (escarpment). Overnight at: Shen Quan Hotel, Luodian; phone: 86-854-7620880 III June 19 (Wednesday) Dajing/ Xiaojing –Southern margin Reef and basin margin facies of the Great bank of Guizhou, Karst features. Afternoon – Qiandao Lake south of Luodian. Overnight at: Shen Quan Hotel, Luodian; phone: 86-854-7620880 June 20 (Thursday) drive back to Guiyang Evening visit to Guiyang Xiaohe Paleontology Museum, visit Quangjiafu Miao restaurant and village. Overnight at: Jinri hotel, Beijing Road, Guiyang; phone: 86-851-6891600 June 21 (Friday) day off in Guiyang, tour to Hongfenghu lake. Overnight at: Jinri hotel, Beijing Road, Guiyang; phone: 86-851-6891600 Geological Field Traverse Leg 2 – Yangtze Platform June 22 (Saturday) depart for western Guizhou. Drive to Zhejin and visit Zhejin Caves. Evening arrive in Anshun, visit Anshun traditional market. Overnight: at Tianpu hotel; Guihuang road, Dianlichen, Anshun, phone: 86-853-3516888 June 23 (Sunday) Drive from Anshun and Huangguoshu. Tourism: Huanggoushu waterfall and Longgong cave and Stone forest. Overnight: Grand Valley Hotel Resort, Huangguoshu, phone:86-853-3595800 June 24 (Monday). Morning drive from Huangguoshu to Guanling. Yangtze platform margin geology at Hongyan section: Lower Triassic ramp through Middle Triassic Reef and platform interior traverse. Platform margin architecture at Dabang. Overnight: Overnight at: QianLing hotel, Guanling; phone:86-853-7228888 June 25 (Tuesday) Morning: Yongningzhen section Yangtze platform interior and + Xinpu lagerstätte. Overnight: Overnight at: QianLing hotel, Guanling; phone:86-853-7228888 June 26 (Wednesday) Drive to Xingyi. Visit Huajiang gorge in route, platform margin traverse, Keichousaurus lagerstätte, Malinghe George Overnight: Qianshan Hotel, Xingyi. phone: 86-859-3116669 June 27 (Thursday) Drive to Zhenfeng. Zhenfeng Platform margin traverse; tectonic controls on margin architecture. Carbonate cyclostratgraphy and sequence stratigraphy exercises at Beila section. Platform termination in upper part of Longchang section. Evening tour of Zhenfeng, + visit of Miao village (Mrs. Yang’s house / village). Overnight at: Jinzhou Hotel, Zhenfeng; phone: 86-859-6618777 IV June 28 (Friday) Return from Zhenfeng to Guiyang. Visit Archosaur trackway site at Liuchang on the way. Tour stop at Tianlong old town and traditional market (2hour) in route to Guiyang 9time permitting). Overnight at: Jinri hotel, Beijing Road, Guiyang; phone: 86-851-6891600 June 29 (Saturday) Depart Guiyang; arrive Beijing Overnight in Beijing (Yuan Shan Hotel; address: 2 Yumin Road, Deshengmenwai, Beijing). June 30 (Sunday) Group tour to Great Wall and the Thirteen Ming Dynasty Tombs Overnight in Beijing (Yuan Shan Hotel; address: 2 Yumin Road, Deshengmenwai, Beijing). July 1 (Monday) Free time in Beijing to visit such places as Tiananmen Square, the Great Wall and the Forbidden City Overnight in Beijing (Yuan Shan Hotel; address: 2 Yumin Road, Deshengmenwai, Beijing). July 2 (Tuesday) Free time in Beijing Overnight in Beijing (Yuan Shan Hotel; address: 2 Yumin Road, Deshengmenwai, Beijing). July 3 (Wednesday) Depart Beijing; arrive U.S. V Syllabus for Wichita State University Instructors: Wan Yang, associate professor, Wichita State University, wan.yang@wichita.edu, 316978-7241 (office) Dan Lehrmann, professor, University of Wisconsin, Oshkosh Youyi Yu, professor, Guizhou University, China Other instructors, to be determined Course goal: This course is designed for undergraduate and graduate students at all levels, who are interested in geology but may or may not be geology majors. The main goal of this course is to learn and practice skills of field observations of a variety of sedimentary rocks, stratigraphy, paleontology, structural geology, and tectonics. Preliminary interpretations of sedimentary environments, tectonics, paleontology, and paleoclimate, and many other geologic features will be taught at different levels. Students should master the basic skills of geologic field work, some basic concepts of sedimentology, stratigraphy, petrology, structural geology, and tectonics. The secondary goal of this course is to learn and comprehend the ancient and modern Chinese history and culture, and relate and compare them to the western culture. Textbook: Lehrmann, D., Yang, W., Yu, Y. , 2009, Field Geology Course – Part Two: Evolution of Ancient Seas, Tropical Reefs, and Life in the Nanpanjiang Basin of Guizhou South China: University of Wisconsin, Oshkosh and Wichita State University. Supplementary readings to be assigned. Course Requirements and Grading: Active participation in individual and team observations and discussions of geological, archeological, and cultural features. Field sketch and photograph geological, archeological, and cultural features. Field measurement of stratigraphic sections and preliminary interpretations of geological features. Complete required drafting of measured sections and required writeups of observations and interpretations. Complete a short report on selected archeological and cultural subjects. The report should be typed with 12-point font, double spaces, and not exceed 5 pages excluding photos and figures. Geological part of the course will count for ¾ of the course grade and archeological and cultural part will count for ¼ of the course grade. The percentage of grade assignment is as follows: 1. Course notebooks (geological, archeological, and cultural) will be graded for its organization and content – 30%. 2. Geology field exercises – 40%. 3. Cultural report as specified above – 25%. 4. Class participation – 5%. VI Syllabus for the University of Wisconsin-Oshkosh FIELD GEOLOGY IN CHINA, SUMMER 2009; 51-360: 3 CREDITS Instructors: Dr. Dan Lehrmann, University of Wisconsin Oshkosh., Dr. Wan Yang, Wichita State University, Dr. Yu Youyi, Guizhou University. Emergency contact information: Dr. Lehrmann’s cell phone number within China_______________________. Professor Yu Youyi’s cell phone within China: 13885047210. Lehrmann’s e-mail address: lehrmann@uwosh.edu Telephone code to the U.S: 001_ Primary UW Oshkosh Emergency Contact: University Police available 24-7; 920-424-1216 or 1212 Office of International Education: 1-920-424-0775 graff@uwosh.edu; mylreab@uwosh.edu , stukenbk@uwosh.edu; Triatikr@uwosh.edu Office of the Provost & Vice Chancellor: 1-920-424-0300 U.S. Hotline for American Travelers: 1-202-647-5225 UW Oshkosh Counseling Center: 1-920-424-2061 Text: Evolution of Ancient Seas, Tropical Reefs, and Life in the Nanpanjiang Basin of Guizhou South China Other Supplies: Field book (hard-back, waterproof), Handlens, pencils, pens, colored pencils, calculator, protractor, camera. (Also attached packing list). Grading: Grades will be based on: a) evaluation of your field notebooks; b) evaluation of your field exercises; and c) your overall attitude and performance on the trip. You will be instructed on how to keep a good field notebook in a meeting prior to our departure for the trip. Course Objectives: Your objectives for this course should, at a minimum, include the following: To open your mind to Chinese culture, language, and way of life. To learn about history and archeological sites in China. To learn how to make and record geological observations in the field and to systematically record them in notes and on a map. To learn how to interpret field observations in terms of the origins of rocks, structures, landforms and the geological history that they represent. To accomplish the above objectives via written geological field book and completed exercises (including small geological maps, geological sketches, and geological problem sets) To gain an understanding of the tectonics, sedimentary environments, facies and stratigraphy of the Nanpanjiang Basin of south China. VII Preface Geologists are historians of the Earth. We decode, interpret, and reconstruct the history of the Earth and the evolution of its systems by reading the geologic history book, that is, the rock records. Thus, it is essential for students in geology to constantly practice and sharpen their skills in field observations. This field course provides such an opportunity by traversing the various environments of two shallow-marine carbonate platforms (the Great Bank of Guizhou, and Yangtze Platform) and adjacent deep marine facies of the Nanpanjiang Basin of south China. Geologic records revealing the history of the Nanpanjiang basin and Yangtze Platform spanning some 25 million years will be examined. Global, regional and local controls on the evolution and architecture of the carbonate platforms -- such as tectonics, sea level fluctuation, climate, volcanism, and detrital sediment flux will be evaluated using field observations. The history of marine life in the shallow-marine reef ecosystems as well as the causes and effects of the end-Permian mass extinction and subsequent biotic recovery will also be examined. The fields of sedimentary geology, paleontology, structural geology, tectonics, petroleum geology and geomorphology in diverse geological settings will be covered. Course participants, beginning or experienced alike, shall benefit from and be satisfied with the intriguing puzzles and histories presented by the spectacular rock exposures. Rocks do not have borders. A new generation of geoscientists shall be openminded to and take advantage of the globalization of world economy and culture in the 21st century. The skills to communicate with and learn from scientists and peers of different academic, cultural, and ideological backgrounds are critical to a person’s successful professional career. We hope that this international expedition will be a lifelong experience in geology, culture, and history for the participants. This collaborative field course has been the fruit of cooperation among many parties and individuals. We appreciate the support and hospitality from our host – Department of Geology, Guizhou University, China. Professor Yu Youyi has been instrumental in originating and logistical planning the field course. Student volunteers of Guizhou University will made the trip enjoyable and memorable. We thank Wei Jiayong who has facilitated the logistics and contributed to our many geologic field mapping expeditions to Guizhou. We acknowledge Paul Enos for initiating the KU research group’s work in south China and for his relentless drive for detailed studies of the carbonate platforms and basin facies of the Nanpanjiang basin. Marcello Minzoni is gratefully acknowleged for contributing key concepts, maps and unpublished results on the geology of the Yangtze Platform in the Dabang and Zhenfeng areas—without his support, leg 2 of this guidebook would not have been possible. We gratefully acknowledge the support from the university administration, geology departments, and fellow colleagues in University of Wisconsin, Oshkosh and Wichita State University. Finally, it is the effort, determination, and curiosity of the student participants that made this course possible, fruitful, and fun. Dan Lehrmann Wan Yang May, 2009 VIII General Geology of China One of the fundamental differences between the geology of China and that of North America is that China is made up of numerous smaller continental blocks (or plates) that many researchers refer to as a “tectonic collage” (cf. Sengor, 1987), whereas North America contains a very large continental nucleus or craton that has been tectonically stable throughout the Phanerozoic. Therefore in considering the geology of China, a large part of the discussion focuses on the continental blocks (plates), the various basins that reside within and between these blocks, the orogenic belts (mountain belts) that occur between the blocks and mark collisions (suture zones) and the provenance and timing of amalgamation of the blocks to form China. Before summarizing the lay out of the geology of China it is useful to begin with a global perspective. Global plate arrangements during the Late Paleozoic were dominated by the supercontinent Pangea bounded to the west by the Panthalassa Ocean and to the east by the tropical Tethys seaway (Fig. 1). During the Late Paleozoic and Triassic, China consisted of several isolated small continents that existed in the Tethys seaway and were part of a group of small continents (also referred to as Cimeria; Sengor, 1987) which rifted from Gondwanna along the southern margin of the Tethys and migrated northward across the Tethys to eventually collide with and accrete to Asia (Fig. 2). Continental blocks that make up China include the North China block (Sino-Korean Craton) the South China Block (Yangtze Craton), Tarim, and several smaller continental blocks such as Lhasa, Qiangtang etc. (Fig. 3). To the west is the Indian plate and to the southwest there are several additional plates (such as Siamo and Indochnina) that comprise southeast Asia (Fig. 3). Many of the continental blocks contain Archean and Proterozoic basement and contain Neoproterozoic sedimentary cover demonstrating that these blocks became stable cratonic elements during the Precambrian. For example the North China block contains Archean metamorphic complexes 2.5BY to as much as 3.1BY overlain by weakly deformed Proterozoic sedimentary cover (Ma et al., 2002), whereas the basement rocks of the south China block are primarily Mesoproterozoic and Neoproterozoic complexes (1150-780Ma and 860-720ma) overlain by Neoproterozoic and Paleozoic sedimentary strata (Liu and Xu, 1994; Xu et al., 1996; Chang, 1996). Plate reconstructions have been made using the timing of deformation and magmatism in orogenic belts, paleomagnetism, and stratigraphy / paleobiogeography (Klimetz, 1983; Sengor, 1987; Enkin, 1993 and Metcalf, 1999, among many others). The reconstructions generally depict progressive collision and amalgamation of tectonic blocks in a “conveyor belt” fashion with earlier docking of northerly blocks (such as the Tarim and North China blocks) followed by successively later docking of southerly blocks (e.g. South China, followed by several blocks in Tibet and south east Asia, and followed finally by the India collision). Enkin et al’s (1993) paleomagnetic reconstructions (Fig. 4) indicate Late Paleozoic docking of the North China block with Mongolia, followed by Triassic collision of the South China block with North China, Permian and Triassic collisions of south east Asian terranes along the southern border of the south China block and Jurassic and Cretaceous collision of the Lhasa and Qiangtang blocks in front of India, and ultimately the collision of India with Asia in the Cenozoic. 1 The geological map of China dramatically reveals that the continent is subdivided by several long orogenic belts many of which can be characterized as suture zones marking the collisional plate boundary between continental blocks. Suture zones are characterized by deformation, ophiolite complexes (ultramafics, basalts, deep sea sediments), metamorphism sometimes characterized by paired high- and low-pressure metamorphic belts, and granitic magmatism. These suture zones include the Erenhot-Hegen (Late Paleozoic; Variscan age) boundary between North China and Mongolia, the Kunlun-Altun-Qilian (bordering the southern Tarim), the Qinling (Triassic, Indosinian age) boundary between the North and South China blocks, the Ailaoshan and Songma sutures between south China and the Siamo and Indochina blocks of southeast Asia, and the Himalaya (Cenozoic, Himalayan age) marking the leading edge of India (Figs. 3, 4, 5). Within and between the tectonic blocks of China there are a great variety of types of marine and terrestrial sedimentary basins. These include the Nanpanjiang and Sichuan basins in the South China block, the Songliao and Bohai basins in Northeast China, the Ordos Basin in central north China, and the Junggar and Tarim Basins in northwest China (Fig. 6). Some of these basins, such as the Nanpanjiang basin of the Paleozoic were the site of marine sedimentation in vast epicontinental seas that transgressed tectonically stable cratons. In other cases such as the Nanpanjiang basin of south China or the Ordos Basin, tectonic convergence and associated tectonic loading resulted in rapid foreland basin subsidence. The Tarim and Junggar, basins can be considered famous examples of terrestrial intermontane basins formed as depressions enclosed on all sides by rising mountain systems. Finally, the Songpan-Ganzi basin in central China (Figs. 4, 6) is a world class example of a remnant basin formed between colliding continents by the incomplete “fit” between the colliding North China, South China and Tibetan tectonic blocks. Our field area of Nanpanjiang basin of Guizhou Province of southern China (Figs. 6, 7) forms a deep- marine embayment in the southern margin of the south China block and is bounded southward by suture zones bordering tectonic blocks of southeast Asia. Because the south China block was involved in tectonic convergence along its northern, southern, and western margins in the Triassic, our field area will allow us to examine basin evolution and other geologic features in the context of the tectonic accretionary setting of China. 2 3 4 5 6 7 8