| 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. |
| Genre: | Article |
| ProdID: | 70014641 |
| Citation Author: | Kan, R. -J.; Hu, H. -X.; Zeng, R. -S.; Mooney, W. D.; Mcevilly, T. V. |
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| Citation End Page: | 437 |
| Citation Issue: | 4775 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 5 |
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| Citation Search Results Text: | Crustal structure of Yunnan province, People‘s Republic of China, from seismic refraction profiles; 1986; Article; Journal; Science; Kan, R. -J.; Hu, H. -X.; Zeng, R. -S.; Mooney, W. D.; Mcevilly, T. V. |
| Citation Start Page: | 433 |
| Citation Volume: | 234 |
| Citation Year: | 1986 |
| Type: | citation/reference |
| Text: | Crustal structure of Yunnan province, People‘s Republic of China, from seismic refraction profiles; 1986; Article; Journal; Science; Kan, R. -J.; Hu, H. -X.; Zeng, R. -S.; Mooney, W. D.; Mcevilly, T. V. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1986 00:00 -0600 |
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