对扬子克拉通西缘四川康定—冕宁变质基底的新认识——来自Nd同位素的证据

陈岳龙; 罗照华; 刘翠

Volume 26 Issue 3

May 2001

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Article Navigation > Earth Science > 2001 > 26(3): 279-285

CHEN Yuelong, LUO Zhaohua, LIU Cui, 2001. NEW RECOGNITION OF KANGDING-MIANNING METAMORPHIC COMPLEXES FROM SICHUAN, WESTERN YANGTZE CRATON: EVIDENCE FROM Nd ISOTOPIC COMPOSITION. Earth Science, 26(3): 279-285.

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NEW RECOGNITION OF KANGDING-MIANNING METAMORPHIC COMPLEXES FROM SICHUAN, WESTERN YANGTZE CRATON: EVIDENCE FROM Nd ISOTOPIC COMPOSITION

Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2000-09-18
Publish Date: 2001-05-25

Abstract

Abstract

The Kangding Group, outcropping around the northern segment of the western Yangtze craton, has been regarded as a typical Archean high-grade terrain for a long time. The Kangding-Luding and Mianning complexes are representatives of the group. An Sm-Nd isochron of 706 Ma was first obtained through the systematic determination of Sm Nd isotopic composition in the amphibolites-TTG gneisses from the Shaba, Mianning county, Sichuan Province. The isochron and Nd depleted mantle model ages of other samples show that the complexes were metamorphic and anatectic products of Neoproterozoic-mafic-ultra-mafic rocks after breakup of Rodinia by a mantle plume. All these evidences suggest that the present outcropping basements of the Yangtze craton are free of a united evolutionary history. Therefore, further study should be made of the basements of the Yangtze craton.
- basement,
- Sm-Nd geochronology and geochemistry,
- mantle plume,
- Neoproterozoic,
- western Yangtze craton

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References(19)

References

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