Crustal Structure of Yunnan Province, People's Republic of China, from Seismic Refraction Profiles.
Science
; 234(4775): 433-7, 1986 Oct 24.
Article
en En
| MEDLINE
| ID: mdl-17792016
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.
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01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Science
Año:
1986
Tipo del documento:
Article