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Geology; October 2004; v. 32; no. 10; p. 917-920; DOI: 10.1130/G20602.1
© 2004 Geological Society of America
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Geologic, geochemical, and geophysical consequences of plume involvement in the Emeishan flood-basalt province

Yi-Gang Xu*,1, Bin He*,1, Sun-Lin Chung*,2, Martin A. Menzies*,3 and Frederick A. Frey*,4

1 Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China
2 Department of Geosciences, National Taiwan University, Taipei 10699, Taiwan
3 Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 OEX, UK
4 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Prevolcanic kilometer-scale lithospheric doming in the Emeishan large igneous province, southwest China, allows us to evaluate the spatial and temporal consequences of uplift on the paleogeography, geology, geochemistry, and geophysics of the region. Systematic spatial variations are observed across the domal structure in the distribution and thickness of clastic and carbonate sediments, the extent of erosion, thickness, and chemistry of volcanic rocks, and the crust-mantle structure. These features, which are best explained by a mantle plume, may be used to track older plume sites in the geologic record.

Key Words: paleogeography • geochemistry • geophysics • plume-lithosphere interaction • Emeishan basalt




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