Curriculum Vitae
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Education
1988 - 1991
1984 - 1987
Dr Jo-Anne Wartho
GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, D21418 Kiel,
Germany.
+49-431-600-2135
+49-431-600-2805
jwartho@geomar.de
28th October 1964.
Dual British/Australian citizenship.
PhD, University of Leeds, UK. ‘Argon isotope systematics and mineralogy of metamorphic
hornblendes from the Karakoram’.
BSc (Honours) Geology, City of London Polytechnic, UK.
Appointments
2015-present Research Scientist, Department of Dynamics of the Ocean Floor – Magmatic and
Hydrothermal Systems, GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 13, D-21418 Kiel, Germany.
2006 - 2014
Associate Research Professional, 40Ar/39Ar Laboratory Manager, Noble Gas, Geochemistry
and Geochronology Laboratories (NG3L), School of Earth and Space Exploration, Arizona
State University (ASU), USA.
2005 - 2006
Curtin University Special Research Fellow (Senior Research Fellow), Curtin University, Perth,
Australia. Manager of the Western Australian Argon Isotope Facility.
2003 - 2005
Senior Research Fellow, Curtin University, Perth, Australia. Manager of the Western
Australian Argon Isotope Facility.
2000 - 2003
Research Fellow, Curtin University, Perth, Australia. Constructed and managed the Western
Australian Argon Isotope Facility for 40Ar/39Ar laser dating.
1997 - 2000
Leverhulme Trust grant fellowship, Open University, Milton Keynes, UK. ‘Crystal-melt noble
gas partitioning: Insights into early Earth degassing’, working with Dr Simon Kelley.
Responsible for running and maintaining the 266 nm ultra-violet (UV) laser, automated Ar
extraction line, and MAP-215 mass spectrometer.
1994 – 1997 National Environmental Research Council (NERC) grant fellowship, Open University, Milton
Keynes, UK. ‘High spatial resolution studies of argon and other noble gases in natural
minerals with special reference to quartz, plagioclase and K-feldspar, using a new ultraviolet laser ablation microprobe’, working with Dr Simon Kelley. Responsible for
constructing and running a new Ar-Ar extraction line and noble gas mass spectrometer for
use with a pioneering 266 nm ultra-violet laser.
1992 – 1994 North Atlantic Treaty Organisation Fellowship, University of California, Los Angeles, USA.
‘40Ar/39Ar age spectrum studies of amphiboles: Age gradients and hydrothermal studies’,
working with Prof. Mark Harrison. Responsible for running two Ar-Ar instruments, plus
radioactive sample handling for the laboratory.
Jan-July 1992 Research Fellowship, University of Leeds, UK. Setting up one-day undergraduate projects
based on North Sea petroleum exploration and Au-Ni exploration and mining in Western
Australia, working with Drs Andy Barnicoat and Graham Stuart.
1987 - 1988
Research Assistant, Birkbeck College, University College London, UK. Apatite fission track
dating and track measurement, working with Dr Ian Evans on a Badley, Ashton and
Associates Ltd. oil consultancy project: "Northern Viking Graben fission track study".
Membership of Committees and Professional Societies
Member of the Earth Composition and Evolution Working Group (2005-2006), which was part of a US$34.6
million 5-year AuScope ‘Structure and Evolution of the Australian Continent’ research proposal to the
Australian Government National Collaborative Research Infrastructure Strategy (funded in 2006).
Council Committee Member of the Western Australian Division of the Geological Society of Australia (20052006).
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Fellow of the Geological Society of London (since 1986).
Fellow of the Mineralogical Society of Great Britain (since 1989).
Member of the American Geophysical Union (1991-2012).
Member of the Geochemical Society (since 2002).
Member of the Meteoritical Society (since 2011).
Awards and grants
2011-2014
Principal-Investigator on a €225,000 NSF grant entitled “The next step in unravelling the
Earth’s impact history: (U-Th)/He dating of impact structures”, in collaboration with co-PI’s
Matthijs van Soest and Kip Hodges (ASU). I hired post-doctoral researcher (Dr Marc Biren)
to work with me on this project from 2013-2014.
2011
€440 Mineralogical Society of London Senior Bursary Award to travel to Darwin, Australia
to attend and present a talk at the Meteoritical Society 2011 conference.
2008
€510 Mineralogical Society of London Senior Bursary Award to travel to Vancouver, Canada
to attend and present an invited talk at the Goldschmidt 2008 conference.
2007-2010
Co-Investigator on a Norwegian Research Foundation grant, in collaboration with Joachim
Jacobs (University of Bergen), to study the crustal architecture and exhumation history of
the Neoproterozoic/early Palaeozoic East African-Antarctic Orogen, in northern
Mozambique.
2007-2011
Chief Investigator on a €25.39 million Australian Government National Collaborative
Research Infrastructure Strategy grant ‘Structure and Evolution of the Australian
Continent’.
2006-2007
Chief Investigator on an Australian Antarctic Division grant to study “Enigmatic Orogeny
during the dispersal of Rodinia: Deciphering the Record of Tectonic Reworking in the
Vestfold Hills, Antarctica”, in collaboration with Alan Collins, Martin Hand, (University of
Adelaide), Simon Harley (University of Edinburgh), and Talari Chetty (National Geophysical
Research Institute, India). This grant included transport, accommodation and logistical
funding for 2 field seasons in Antarctica (2006/7 and 2008).
2006-2010
Chief Investigator on a €1.12 million Western Australian State Government Centres of
Excellence in Science and Innovation Program grant, for 5 years funding for the John de
Laeter Centre of Mass Spectrometry, in collaboration with Peter Cawood (University of
Western Australia) and 14 others.
2005 - 2009
€104,000 Curtin University Special Research Fellowship awarded for 5 years to study
“Determining the ages and rates of deformation in the Earth’s crust”. I hired Dr Sandra
Occhipinti part-time (2006) to undertake research and laboratory duties.
2004 - 2007
Chief Investigator on a €92,000 Australian Research Council Large Discovery grant to study
“Understanding the Sibao Orogenic Belt in South China: A part of the Rodinian
Supercontinent assembly adjacent to Australia”, in collaboration with Zheng-Xiang Li
(University of Western Australia) and Xuan-Hua Li (Chinese Academy of Sciences).
2002
Chief Investigator on a €6,500 Curtin University Small Linkage Grant to study “Ar-Ar laser
dating of vacuum encapsulated clay samples – A new development in geochronology”, in
collaboration with Horst Zwingmann (CSIRO).
2002
Chief Investigator on a €10,900 Australian Commonwealth Scientific and Research
Organisation (CSIRO) Linkage Grant industry contribution, to study “Ar-Ar laser dating of
vacuum encapsulated clay samples – A new development in geochronology”, in
collaboration with Horst Zwingmann (CSIRO).
1997 - 2000
€148,000 Leverhulme Trust grant to study “Crystal/melt noble gas partitioning: Insights into
early Earth degassing”, in collaboration with Simon Kelley (Open University).
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1998 – 2000
Chief Investigator on a €16,000 NERC Small Grant to study “Determining the fundamental
parameters of argon in feldspars and feldspathoids”, in collaboration with Simon Kelley
(Open University) and Steve Elphick (Edinburgh University).
1998
€510 Mineralogical Society of London Senior Bursary Award to travel to Cape Town, South
Africa to attend the 7th International Kimberlite conference and to take part in a preconference mantle xenolith collecting fieldtrip.
1997 – 1998
Chief Investigator on a €39,000 Open University Research and Development funding to
install forescatter imaging and Electron Backscattered Diffraction (EBSD) detectors and
software onto the Open University scanning electron microscope, in collaboration with
Naomi Williams (Open University).
1992 - 1994
NATO Research Fellow award, covering salary, travel, and accommodation for two years, at
UCLA.
1992 - 1994
€11,000 National Science Foundation grant for experimental work attached to NATO
Fellowship, in collaboration with Mark Harrison (UCLA).
1991
€510 Mineralogical Society of London Student Bursary award to travel to Baltimore, USA to
attend and present an invited talk at the Spring American Geophysical Union meeting.
Responsibilities
I moved to Kiel, Germany in January 2015 to manage the GEOMAR Ar-Ar laboratory and build a new high
sensitivity instrument to be equipped with a Thermo Helix MC Plus multi-collector mass spectrometer,
argon extraction line, and new Coherent argon ion laser. This system will be fully automated to allow laser
total fusion and step-heating of K-bearing samples. The GEOMAR laboratory is currently equipped with a
fully automated MAP 216 mass spectrometer, argon ion laser and small volume extraction line.
Working with Dr Matthijs van Soest and Professor Kip Hodges at ASU from October 2006 to December
2014, I constructed and operated a state-of-the-art noble gas laboratory, equipped with 3 multi-collector
and 1 quadrupole noble gas mass spectrometers, 6 lasers (2 x 193 nm ArF Excimer lasers, 3 x 970-980 nm
diode lasers, and one CO2 laser (newly installed)), 2 x double-vacuum furnaces, crushers, and fully
automated extraction lines to undertake in situ laser spot, step-heating and single grains analyses for the
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Ar/39Ar, U-Th/He and cosmogenic Ne dating techniques, and noble gas geochemistry. I was also in charge
of chemical, laser and radiation safety in 6 of 7 of our ASU laboratories.
From 2000 – 2001, I constructed the Western Australian Argon Isotope Facility 40Ar/39Ar laser-dating
laboratory in the Department of Applied Geology, Curtin University. This 40Ar/39Ar laser-dating laboratory
consisted of a computer controlled high-resolution high-sensitivity MAP 215-50 noble gas mass
spectrometer, two computer controlled lasers to melt rock and mineral samples to extract Ar gas, and a
fully automated noble gas extraction line for cleaning up the gases prior to introduction into the mass
spectrometer. In the four years of operation, I was solely in charge of day-to-day maintenance,
coordinating irradiation packages, radioactive sample handling and loading, training of new users in the
laboratory, and undertaking 40Ar/39Ar analyses, number crunching, interpretation of 40Ar/39Ar age data and
report writing for service and commercial contracts. From November 2003 onwards, the 40Ar/39Ar
laboratory was self-funded with 100% of my salary and all laboratory costs to be met by income earned
from user costs and commercial contracts.
Previously, I was in charge of maintaining and running the UV laser system, noble gas extraction line, and
MAP 215-50 mass spectrometer at the Open University for six years. I constructed the UV laser 40Ar/39Ar
extraction line at the Open University in 1994-95 to analyse Ar isotopes, as well as other noble gases (He,
Ne, Kr and Xe).
During 1992-1994 I was responsible for radiation safety and handling for the 40Ar/39Ar laboratory at UCLA,
as well as being co-responsible for the daily running of two mass spectrometers (VG 3600 and VG 1200S), 2
argon extraction lines, an argon ion laser, and a double-vacuum furnace.
Teaching and Supervising Experience
I have supervised two post-doctoral researchers, Dr Sandra Occhipinti (part-time) in 2006 at Curtin
University, and Dr Marc Biren (2013-2014) at ASU. My teaching experience includes the training of all
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Ar/39Ar laboratory users in the laboratory (students, post-doctoral researchers, and outside contractor
scientist), providing experience on selecting suitable samples and the appropriate dating technique for
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Ar/39Ar analysis, undertaking 40Ar/39Ar analyses, number crunching and interpretation of 40Ar/39Ar age
data. I have undertaken this teaching at the University of California, Los Angeles, the Open University,
Curtin University, and ASU. I have given half- and one-day courses in Ar-Ar dating to Ph.D. students at
Curtin University.
Research Interests
My geological research interests are wide ranging and include:
 The development and application of the low-temperature (U-Th)/He geochronological technique to
the dating of 20 terrestrial impact structures, from as large as Manicouagan, Canada (90 km diameter)
to as small as Monturaqui, Chile (350 m diameter).
 40Ar/39Ar dating of mica grains from the intestine contents of the ‘Ötzi, the Alpine Iceman’, a Neolithic
mummy preserved within a glacier in the European Alps, to determine his provenance before death.
 Experimental studies of noble gas (He, Ne, Ar, Kr and Xe) partitioning, diffusion and solubility in a
variety of minerals (K-feldspar, plagioclase, phlogopite, leucite, nepheline, garnet, apatite,
clinopyroxene and olivine) pertaining to magma evolution and degassing, the Earth’s early atmosphere
development, and noble gas closure temperatures.
 40Ar/39Ar in situ UV laser white mica dating of metamorphic and deformation events in the
economically important Lachlan Fold Belt (New South Wales, Australia) and Hamersley Basin (Western
Australia).
 40Ar/39Ar determination of the thermal and deformation history of the Jack Hills region in Western
Australia, which contains the world’s oldest zircon grains.
 40Ar/39Ar dating of metamorphic and deformation events in Bhutan, Tibet, Chile, India, Ireland,
Mozambique, Madagascar, Mauritania, Nepal, South China, and New Zealand.
 40Ar/39Ar dating of the ca. 30 km diameter Yarrabubba impact crater, Western Australia.
 The construction of a 40Ar/39Ar vacuum encapsulation station, the first in the southern hemisphere, to
allow the 40Ar/39Ar dating of fine-grained clays and other potassium-bearing minerals, which is not
possible using the conventional 40Ar/39Ar dating technique due to Ar recoil problems during neutron
irradiation.
 Studies of 40Ar/39Ar age profiles in phlogopites in mantle xenoliths from diamond-bearing and nondiamond-bearing kimberlites, yielding ages of metasomatic events within the Earth’s mantle and
kimberlite eruption, and kimberlite pipe accent rates from depths of 100-200 km.
 40Ar/39Ar dating of blueschist metamorphic exhumation events in Chile and South China.
 40Ar/39Ar dating of detrital micas in provenance studies in Chile, Russia, South Australia, India, and
Nepal.
 40Ar/39Ar dating of worldwide jade samples to determine a method for identifying the provenance of
New Zealand jade artefacts and jade that is illegally imported into New Zealand.
 40Ar/39Ar dating of gold mineralization events in Kyrgyzstan and Western Australia.
 A study of the thermal effects and duration of turbulent flow in a magma feeder on the Isle of Mull,
Scotland, using 40Ar/39Ar analysis of micas in the adjacent Moine country rocks.
 40Ar/39Ar dating studies of metamorphism in the Pakistani Himalayas.
 40Ar/39Ar dating of Deccan basaltic dykes.
 In situ high spatial-resolution UV laser 40Ar/39Ar dating of K-feldspar cements in sandstones, relating to
hydrocarbon source rocks.
 Electron backscattered diffraction (EBSD) studies of geological and metallurgical materials.
 Advancement of the UV laser 40Ar/39Ar dating technique, pioneered in 1993, having installed and used,
266, 213 and 193 UV lasers in 3 laboratories.
 The development of new experimental techniques for 40Ar/39Ar geochronology and electron
microscopy.
Contract work
I have undertaken various commercial contracts for 40Ar/39Ar dating on oil, gas, ore and mineral deposits,
including: Saudi Aramco (Saudi Arabia), Waha Oil Company (Libya), Wintershall AG (Germany/Libya),
CODELCO (Chile), Brazilian Geological Survey, Geoservices (Indonesia), Santos (Australia), Northern Star
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Resources (Australia), Placer Dome Asia Pacific (Australia), CSIRO (Australia), and the Australian State
Geological Surveys of the Northern Territory, New South Wales, and Western Australia.
Other information
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I have been an examiner of two Ph.D. thesis defences (University of Melbourne, Australia in 2007 and
2013).
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I am reviewer of research grants for the National Science Foundation (USA), National Environmental
Research Council (UK), Australian Research Council, and the Science Foundation of Ireland.
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I regularly review research manuscripts for Geology, Earth and Planetary Science Letters, Geochimica
et Cosmochimica Acta, Journal of Petrology, Chemical Geology, American Mineralogist, American
Mineralogy Reviews, Contributions to Mineralogy and Petrology, Meteoritics and Planetary Science,
Journal of Structural Geology, Journal of the Geological Society of London, Geological Society of
London Special Publications, Geological Society of America Special Publications, Terra Nova, Australian
Journal of Earth Sciences, and New Zealand Journal of Geology and Geophysics.
Research articles and book chapters in chronological order
The number of citations quoted at the end of each article was obtained from Google Scholar (January 2015).
Total number of citations = 1027.
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Cooper F. J., van Soest M.C., Wartho J-A., Hodges K. V., Buchner E., Schmieder M., and Koeberl, C., in
preparation, (U-Th)/He dating of the Nördlinger Ries impact structure, Germany.
van Soest M. C., Zullo J., Cooper F. J. Wartho J.-A., Hodges K. V., Glass W. P., Buchner E., Schmieder M.,
and Koeberl, C., in preparation, A further investigation of the influence of impact related shock effects
on (U-Th)/He ages of Nördlinger Ries impact structure, Germany.
Ukstins Peate I., Wartho J-A., van Soest M. C., Cabrol N. A., Grin E. A., and Chong G., in preparation,
Geochronological dating of a small and young impact structure – Monturaqui crater, Chile.
Biren M. B., van Soest M. C., Wartho J-A., Hodges K.V., Dence M.R., and Spray J. G., in preparation,
Single crystal (U-Th)/He zircon dating of the Clearwater West and East impact structures, Quebec,
Canada.
Young, K.E., Mercer, C.M., Hodges, K.V., van Soest, M.C., Wartho, J-A., Osinski, G.R., and Marion, C.L.,
submitted, Geochronology and Thermochronology of the Mistastin Lake Impact Structure, Labrador,
Canada.
1. Mercer, C.M., Young, K.E., Weirich, J.R., Hodges, K.V., Jolliff, B.L., Wartho, J-A., and van Soest, M. in
press, Refining lunar impact chronology through high spatial resolution 40Ar/39Ar dating of impact melts,
Science Advances.
2. Fox, B., Wartho, J-A., Wilson, G.S., Lee, D.E., Nelson, F.E., and Kaulfuss, U., 2015, Long-term evolution of
an Oligocene/Miocene maar lake from Otago, New Zealand, Geochemistry, Geophysics, Geosystems,
DOI: 10.1002/2014GC005534. (0 citations)
3. Biren, M. B., van Soest, M. C., Wartho, J-A., and Spray, J. G., 2014, (U-Th)/He dating of uplift-induced
cooling in a complex terrestrial impact structure: The Manicouagan example, Chemical Geology, 377,
56-71. (0 citations)
4. Wartho, J.A., Kelley, S.P. and Elphick, S.C., 2013, Ar diffusion and solubility measurements in plagioclase
using the Ultra-Violet Laser Ablation Microprobe, Advances in 40Ar/39Ar Dating: From Archaeology to
Planetary Sciences, Geological Society, London, Special Publications, 378, doi.org/10.1144/SP378.13. (1
citation)
5. Long, S.P., McQuarrie, N., Tobgay, T., Coutand, I., Cooper, F.J., Reiners, P.W., Wartho, J., and Hodges,
K.V., 2012, Variable shortening rates in the eastern Himalayan thrust belt, Bhutan: Insights from
multiple thermochronologic and geochronologic datasets tied to kinematic reconstructions, Tectonics,
doi:10.1029/2012TC003155. (13 citations)
6. Wartho, J-A., van Soest, M.C., King, D.T. Jr., and Petruny, L.W., 2012, An (U-Th)/He geochronological
age for the shallow-marine Wetumpka impact structure, Alabama, USA, Meteoritics and Planetary
Science, 47, 1243-1255. (3 citations)
7. Ueda, K., Jacobs, J., Thomas, R.J., Kosler, J., Horstwood, M.S.A., Wartho, J-A., Jourdan, F., Emmel, B.,
and Matola, R., 2012, Post-collisional high-grade metamorphism, orogenic collapse and differential
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cooling of the East African Oregen of Northeast Mozambique, Journal of Geology, 120, 507-530. (5
citations)
van Soest, M.C., Hodges, K.V., Wartho, J-A., Monteleone, B.D. and Ramezani, J., 2011, (U-Th)/He dating
of terrestrial impact structures; The Manicouagan example, Geochemistry, Geophysics, Geosystems, 12,
QOAA16, doi:10.1029/2010GC003465. (11 citations)
Li, Z-X., Li, X-H., Wartho, J-A., Clark, C., Li, W-X., Zhang, C. and Bao, C., 2010, Magmatic and
metamorphic events during the Caledonian Wuyi-Yunkai Orogeny, southeastern South China: New age
constraints and P-T conditions, Geological Society of America Bulletin, 122, 772-793. (164 citations)
Daszinnies, M.C., Jacobs, J., Wartho, J-A. and Grantham, G.H., 2009, Post Pan-African thermo-tectonic
evolution of the north Mozambican basement and its implication in the Gondwana rifting. Inferences
from 40Ar/39Ar hornblende, biotite and titanite fission-track dating, Thermochronological Methods:
From Paleotemperature Constraints to Landscape Evolution Models, Geological Society, London, Special
Publications, 324, 261-286. (10 citations)
Spaggiari, C.V., Wartho, J-A., Wilde, S.A. and Bodorkos, S., 2008, Proterozoic development of the
northwestern margin of the Archean Yilgarn craton, Precambrian Research, 162, 354-384. (12 citations)
Emmel, B., Jöns, N., Kröner, A., Jacobs, J., Wartho, J-A., Schenk, V., Razakamanana, T., and Austegard,
A., 2008, From closure of the Mozambique ocean to Gondwana breakup - new evidences from
geochronological data of the Vohibory terrane, SW Madagascar, Journal of Geology, 116, 21-381. (26
citations)
Li, Z-X., Wartho, J-A., Occhipinti, S., Zhang, C-L., Li, X-H., and Bao, C., 2007, Early history of the eastern
Sibao Orogen (South China) during the assembly of Rodinia: New mica 40Ar/39Ar dating and SHRIMP UPb detrital zircon provenance constraints, Precambrian Research, 159, 79-94. (126 citations)
Downes, P. J., Wartho, J-A. and Griffin, B.J., 2006, Magmatic evolution and ascent history of the Aries
micaceous kimberlite, Central Kimberley Basin, Western Australia: Evidence from zoned phlogopite
phenocrysts, and UV laser 40Ar/39Ar analysis of phlogopite-biotite, Journal of Petrology, 47, 1751-1783.
(13 citations)
Pirajno, F. and Wartho, J-A., 2005, Ar-Ar geochronology of a pseudotachylite sample from the
Yarrabubba impact structure, Western Australia, Australian Journal of Earth Sciences, 52, 603-605. (23
citations)
16. Quinn, D., Meere, P.A. and Wartho, J-A., 2005, A Chronology Of Foreland Deformation: Ultra-violet
Laser 40Ar/39Ar Dating of Syn/Late-Orogenic Intrusions from the Variscides of Southwest Ireland, Journal
of Structural Geology, 27, 1413-1425. (6 citations)
17. Willner, A.P., Thomson, S.N., Kröner, A., Wartho, J-A., Wijbrans, J. and Hervé, F., 2005, Time markers for
the evolution and exhumation history of the Upper Paleozoic paired metamorphic belt in Central Chile
(34°-35°30’S), Journal of Petrology, 46, 1835-1858. (63 citations)
18. Wartho, J-A., Kelley, S.P. and Elphick, S.C., 2005, Estimates of Ar diffusion and solubility in leucite and
nepheline: Electron microprobe imaging of Ar distribution in a mineral, American Mineralogist, 90, 954962. (6 citations)
19. Haines, P.W., Turner, S.P., Kelley, S.P., Wartho, J-A. and Sherlock, S., 2004, 40Ar/39Ar dating of detrital
muscovite in provenance investigations: a case study from the Adelaide Rift Complex, South Australia,
Earth and Planetary Science Letters, 227, 297-311. (23 citations)
20. Willner, A.P., Wartho, J-A., Kramm, U. and Puchkov, V.N. 2004, Laser 40Ar-39Ar ages of single detrital
white mica grains related to the exhumation of Neoproterozoic and Late Devonian high pressure rocks
in the Southern Urals (Russia), Geological Magazine, 141, 161-172. (12 citations)
21. Mueller, W., Friche, H., Halliday, A.N., McCulloch, M.T. and Wartho, J-A., 2003, Origin and migration of
the Alpine Iceman, Science, 302, 862-866. (133 citations)
22. Wartho, J-A. and Kelley, S.P., 2003, 40Ar/39Ar ages in mantle xenolith phlogopites: Determining the ages
of multiple lithospheric mantle events and diatreme ascent rates in southern Africa and Malaita,
Solomon Islands, Geochronology: Linking the Isotopic Record with Petrology and Textures, Geological
Journal, London, Special Publications, 220, 231-248. (15 citations)
23. Brooker, R.A., Du, Z., Blundy, J.D., Kelley, S.P., Allan, N.L., Wood, B.J., Chamorro, E.M., Wartho, J-A. and
Purton, J.A., 2003, The ‘zero charge’ partitioning behaviour of noble gases during mantle melting,
Nature, 423, 738-741. (66 citations)
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24. Chamorro, E.M., Brooker, R.A., Wartho, J-A., Wood, B.J., Kelley, S.P. and Blundy, J.D., 2002, Ar
partitioning between clinopyroxene and silicate melt at high pressures, Geochimica et Cosmochimica
Acta, 66, 507-519. (40 citations)
25. Wartho, J-A., Kelley, S.P. and Blake, S., 2001, Magma flow regimes in sills deduced from Ar isotope
systematics of micas in host rocks, Journal of Geophysical Research, 106, B3, 4017-4036. (14 citations)
26. Kempton, P.D., Downes, H., Neymark, L., Wartho, J.A, Sharkov, E.V. and Zartman, R., 2001, Garnet
granulite xenoliths from the northern Baltic Shield – The lower crust of the Paleoproterozoic LIP?,
Journal of Petrology, 42, 731-763. (73 citations)
27. Kelley, S.P. and Wartho, J-A., 2000, Rapid kimberlite ascent and the significance of Ar-Ar ages in
xenolith phlogopites, Science, 289, 609-611. (147 citations)
28. Wartho, J-A., Kelley, S.P., Brooker, R.A., Carroll, M.A., Villa, I.M. and Lee, M.R., 1999, Direct
measurement of argon diffusion profiles in a gem-quality Madagascar K-feldspar using the Ultra-violet
Laser Ablation Micro-Probe, Earth and Planetary Science Letters, 170 (1), 141-153. (74 citations)
29. Brooker, R.A., Wartho, J-A., Carroll, M.R., Kelley, S.P., and Draper, D.S., 1998. Preliminary UVLAMP
determinations of Ar partitioning between silicate melts and olivine or clinopyroxene crystals:
Preliminary results and comparison with previous studies, Chemical Geology, 147, 185-200. (37
citations)
30. Wartho, J-A., Rex, D.C., and Guise, P.G., 1996, Excess argon in amphiboles linked to greenschist facies
alteration in the Kamila Amphibolite Belt, Kohistan island arc system, Northern Pakistan: Insights from
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Ar/39Ar step-heating and acid leaching experiments, Geological Magazine, 133, 595-609. (19
citations)
31. Wartho, J-A., 1995, Apparent diffusive loss 40Ar/39Ar age gradients in amphiboles, Earth and Planetary
Science Letters, 134, 395-407. (38 citations)
32. Wartho, J-A., 1995, Photo-emission electron microscopy (PEEM) heating investigations of a natural
amphibole sample, Mineralogical Magazine, 59, 121-127. (9 citations)
33. Rex, D.C., Guise, P.G., and Wartho, J-A., 1993, Disturbed 40Ar/39Ar spectra from hornblendes: Thermal
loss or contamination?, Chemical Geology, 103, 271-281. (47 citations)
34. Wartho, J-A., Dodson, M.H., Rex, D.C., and Guise, P.G., 1991, Mechanisms of Ar release from Himalayan
metamorphic hornblende, American Mineralogist, 76, 1446-1448. (40 citations)
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