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Titolo:
Polybaric partial melting in the continental mantle: Evidence from mantle xenoliths from Qilin, Guangdong Province
Autore:
Xu, YG; Yan, W; Sun, M; Liu, Y; He, ZC; Shi, LB;
Indirizzi:
Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China Chinese Acad Sci Guangzhou Peoples R China 510640 10640, Peoples R China Chinese Acad Sci, Inst S China Oceanog, Guangzhou 510240, Peoples R China Chinese Acad Sci Guangzhou Peoples R China 510240 10240, Peoples R China Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China UnivHong Kong Hong Kong Hong Kong Peoples R China Kong, Peoples R China State Seismol Bur, Inst Geol, Beijing 100029, Peoples R China State Seismol Bur Beijing Peoples R China 100029 100029, Peoples R China
Titolo Testata:
CHINESE SCIENCE BULLETIN
fascicolo: 20, volume: 46, anno: 2001,
pagine: 1732 - 1736
SICI:
1001-6538(200110)46:20<1732:PPMITC>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRACE-ELEMENT; PERIDOTITE XENOLITHS; SOUTHEASTERN CHINA; CONSTRAINTS; GARNET; LITHOSPHERE; GEOTHERM; ORIGIN; PLUMES; SPINEL;
Keywords:
mantle xenoliths; trace element; polybaric melting; Qilin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Xu, YG Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, PeoplesR China Chinese Acad Sci Guangzhou Peoples R China 510640 Peoples R China
Citazione:
Y.G. Xu et al., "Polybaric partial melting in the continental mantle: Evidence from mantle xenoliths from Qilin, Guangdong Province", CHIN SCI B, 46(20), 2001, pp. 1732-1736

Abstract

The extremely low Ti content (160-245 mug/g) in clinopyroxene in some spinet peridotites from Qilin, South China is indicative of high degree of partial melting, inconsistent with their relatively high clinopyroxene modes (7.4%-12.4%). These clinopyroxenes show fractionated HREE patterns ((Gd/Yb)(n)<0.2), suggesting the involvement of garnet in the melting regime. These REE patterns can be modeled as residues of 22%-23% fractional melting from aprimitive mantle, first in garnet stability field (12%) then continuing inspinet stability field (10%-11%) after breakdown of garnet to pyroxenes and spinet. Such a polybaric melting suggests the lithospheric thinning and rapid mantle upwelling in south China during the Cenozoic. This is consistent with the dominant MORB-OIB isotopic signature and high thermal gradient of the lithospheric mantle in this region, and supports the contention that the formation of South China Sea basin is related to southward migration ofcontinental lithosphere extension, rather than passive back-arc basin.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 11:59:27