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| RESEARCH TOPICS AND OBJECTIVES |
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We study convergent margin petrotectonic processes related to continental subduction and collision, with emphasis on mantle and crustal rocks recrystallized at mantle depths along subduction zones. We determine the pressure-temperature-time paths of these ultrahigh-pressure and high-P rocks using fundamental observations coupled with state-of-the-art analytical tools in order to understand the mechanisms and origins of these rocks and what they tell us about subduction, exhumation, fluid-slab-mantle interactions, mantle dynamics, and continental evolution.
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| RESEARCH TECHNIQUES |
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Our research involves geological analysis at multiple length- and time-scales:
- global- and orogen-scale, using tectonic reconstructions and regional geologic mapping;
- outcrop- to thin section-scale, using detailed outcrop and drill-core observations, paragenesis and deformational history using optical and electron petrography; origin and ages of protoliths, metamorphism, metasomatisam and fluid-rock interactions using major- and trace-element geochemistry and geo/thermochronology by the 40Ar/39Ar and SHRIMP-RG U/Pb methods;
- micron- to atomic-scale, using major element composition and
zoning profiles determined by electron microprobe, mineral micro-inclusion identification by laser Raman spectroscopy, synchrotron micro-XRD/XRF, and transmission electron microscopy.
- Billion-year timescale: evolution and growth of the continental crust, geochemical exchange between the crust and mantle.
- Million- to 10s of million-year timescale: evolution of orogenic belts, rates of subduction, exhumation, cooling, and retrogression.
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| COLLABORATORS |
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Our main Stanford collaborators are the SHRIMP-RG Lab (Joe Wooden, Mike McWilliams, Frank Mazdab, and Bettina Wiegand), the Noble Gas Lab (Mike McWilliams), the Crustal Geophysics Group (Simon Klemperer, George Thompson, Norm Sleep), the Structural Geology and Tectonics Group (Elizabeth Miller), and the Sedimentary Research Group (Steve Graham and Don Lowe).
Our research also involves collaboration with many scientists from China (CAGS, e.t.c.), Taiwan (Institute of Earth Sciences, e.t.c.), Japan (Tokyo Institute of Technology, e.t.c.), Russia, and the U.S. as part of our many international cooperative projects in major orogens in California, western Pacific, Himalaya, China, northern Kazakhstan and central America.
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| CURRENT RESEARCH PROJECTS |
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