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Journal of Zhejiang University SCIENCE A 2004 Vol.5 No.8 P.979-984


Petrology, geochemistry and geodynamics of basic granulite from the Altay area, North Xinjiang, China

Author(s):  LI Zi-long, CHEN Han-lin, YANG Shu-feng, DONG Chuan-wan, XIAO Wen-jiao

Affiliation(s):  Department of Earth Sciences, College of Science, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   hlchen@zju.edu.cn

Key Words:  Basic granulite, Petrology and geochemistry, Geodynamics, Altay orogenic belt, North Xinjiang

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LI Zi-long, CHEN Han-lin, YANG Shu-feng, DONG Chuan-wan, XIAO Wen-jiao. Petrology, geochemistry and geodynamics of basic granulite from the Altay area, North Xinjiang, China[J]. Journal of Zhejiang University Science A, 2004, 5(8): 979-984.

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author="LI Zi-long, CHEN Han-lin, YANG Shu-feng, DONG Chuan-wan, XIAO Wen-jiao",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Petrology, geochemistry and geodynamics of basic granulite from the Altay area, North Xinjiang, China
%A LI Zi-long
%A CHEN Han-lin
%A YANG Shu-feng
%A DONG Chuan-wan
%A XIAO Wen-jiao
%J Journal of Zhejiang University SCIENCE A
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%P 979-984
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%D 2004
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2004.0979

T1 - Petrology, geochemistry and geodynamics of basic granulite from the Altay area, North Xinjiang, China
A1 - LI Zi-long
A1 - CHEN Han-lin
A1 - YANG Shu-feng
A1 - DONG Chuan-wan
A1 - XIAO Wen-jiao
J0 - Journal of Zhejiang University Science A
VL - 5
IS - 8
SP - 979
EP - 984
%@ 1869-1951
Y1 - 2004
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2004.0979

The basic granulite of the altay orogenic belt occurs as tectonic lens in the Devonian medium- to lower-grade metamorphic beds through fault contact. The Altay granulite (AG) is an amphibole plagioclase two-pyroxene granulite and is mainly composed of two pyroxenes, plagioclase, amphibole and biotite. Its melano-minerals are rich in Mg/(Mg+Fe2+), and its amphibole and biotite are rich in TiO2. The AG is rich in Mg/(Mg+Fe2+), Al2O3 and depletion of U, Th and Rb contents. The AG has moderate ∑REE and LREE-enriched with weak positive Eu anomaly. The AG shows island-arc pattern with negative Nb, P and Ti anomalies, reflecting that formation of the AG may be associated with subduction. Geochemical and mineral composition data reflect that the protolith of the AG is calc-alkaline basalt and formed by granulite facies metamorphism having peak P-T conditions of 750 °C-780 °C and 0.6-0.7 Gpa. The AG formation underwent two stages was suggested. In the early stage of oceanic crustal subduction, calc-alkaline basalt with island-arc environment underwent granulite facies metamorphism to form the AG in deep crust, and in the late stage, the AG was thrust into the upper crust.

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