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Science 24 October 1986:
Vol. 234. no. 4775, pp. 433 - 437
DOI: 10.1126/science.234.4775.433
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Articles

Crustal Structure of Yunnan Province, People's Republic of China, from Seismic Refraction Profiles

RONG-JU KAN 1, HONG-XIANG HU 2, RONG-SHENG ZENG 2, WALTER D. MOONEY 3, and THOMAS V. MCEVILLY 4

1 Yunnan Seismological Bureau in Kunming, People's Republic of China.
2 Institute of Geophysics, State Seismological Bureau, Beijing, People's Republic of China.
3 Branch of Seismology, U.S. Geological Survey, Menlo Park, CA 94025.
4 Department of Geology and Geophysics and the Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.

Seismic refraction, profiles in Yunnan Province, southwestern China, define the crustal structure in an area of active tectonics on the southern end of the Himalaya-Burma arc. The crustal thickness ranges from 38 to 46 kilometers, and the relatively low mean crustal velocity indicates a crustal composition compatible with normal continental crust and consisting mainly of meta-sedimentary and silicic intrusive rocks, with little mafic or ultramafic component. This composition suggests a crustal evolution involving sedimentary processes on the flank of the Yangtze platform rather than the accretion of oceanic island arcs, as has been proposed. An anomalously low upper-mantle velocity observed on one profile but not on another at right angles to it may indicate active tectonic processes in the mantle or seismic anisotropy.


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