大别—苏鲁超高压地体折返过程中岩石组合演化的地球化学约束

杨启军; 钟增球; 周汉文

Volume 28 Issue 3

May 2003

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YANG Qi-jun, ZHONG Zeng-qiu, ZHOU Han-wen, 2003. Geochemistry Constrains on Rock Association of UHP Terrane during Exhumation. Earth Science, 28(3): 241-249.

Citation:

YANG Qi-jun, ZHONG Zeng-qiu, ZHOU Han-wen, 2003. Geochemistry Constrains on Rock Association of UHP Terrane during Exhumation. Earth Science, 28(3): 241-249.

YANG Qi-jun, ZHONG Zeng-qiu, ZHOU Han-wen, 2003. Geochemistry Constrains on Rock Association of UHP Terrane during Exhumation. Earth Science, 28(3): 241-249.

Citation:

YANG Qi-jun, ZHONG Zeng-qiu, ZHOU Han-wen, 2003. Geochemistry Constrains on Rock Association of UHP Terrane during Exhumation. Earth Science, 28(3): 241-249.

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Geochemistry Constrains on Rock Association of UHP Terrane during Exhumation

Faculty ofEarth Sciences, China University ofGeosciences, Wuhan 430074, China

Received Date: 2002-11-25
Publish Date: 2003-05-25

Abstract

Abstract

The present rock association of the UHP terrane in Dabie-Sulu region, China results from the result of source UHP rocks rebuilt by retrogressive metamorphism, tectonics, anatexis during the exhumation. The dynamics of reformation is the conversion of tectonics, basal erosion and delimitation by means of metamorphism, structure-replacement and anatexis. The UHP terrane is composed of ecologite, marble, jadeite-quartzite, amphibolites, gneisses and foliated granites. In terms of geology and geochemistry, the amphibolite is found to have evolved from ecologite by retrogressive metamorphism and gneisses, foliated granite to have evolved from the amphibolite by anatexis. The anatexis started at 230 Ma when the UHP terrane exhumed to the low crust and turned intense in the middle-low crust. The melting composition from the anatexis of amphibolite is equal to tantalite or granodiorite (in agreement with gneisses). Moreover, the melt from the partial-melting of gneisses with A-type granite composition (which is the same with the foliated granite). The gneisses and foliated granites have both evolved from ecologite by retrogressive metamorphism and delivery anatexis.
- exhumation,
- delivery anatexis,
- rock association,
- evolution,
- Dabie-Sulu

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References(16)

References

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