Crustal structure of Yunnan province, People's Republic of China, from seismic refraction profiles
Science
By: R.-J. Kan, H.-X. Hu, R.-S. Zeng, W. D. Mooney, and T.V. McEvilly
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Abstract
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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Crustal structure of Yunnan province, People's Republic of China, from seismic refraction profiles |
| Series title | Science |
| Volume | 234 |
| Issue | 4775 |
| Year Published | 1986 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Science |
| First page | 433 |
| Last page | 437 |
| Google Analytic Metrics | Metrics page |