阿尔泰造山带南缘中泥盆世苦橄岩及其大地构造和岩石学意义

张招崇; 闫升好; 陈柏林; 周刚; 何永康; 柴凤梅; 何立新

Volume 30 Issue 3

May 2005

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Article Navigation > Earth Science > 2005 > 30(3): 289-297

ZHANG Zhao-chong, YAN Sheng-hao, CHEN Bo-lin, ZHOU Gang, HE Yong-kang, CHAI Feng-mei, HE Li-xin, 2005. Middle Devonian Picrites of South Margin of Altay Orogenic Belt and Implications for Tectonic Setting and Petrogenesis. Earth Science, 30(3): 289-297.

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Middle Devonian Picrites of South Margin of Altay Orogenic Belt and Implications for Tectonic Setting and Petrogenesis

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
5.
No.4 Geological Team, Xinjiang Bureau of Geology and Mineral Resources, Altay 836500, China

Received Date: 2005-02-28
Publish Date: 2005-05-25

Abstract

Abstract

Middle Devonian picrites of the south margin of Altay orogenic belt occur in the lower part of the Beitashan Fm., overlain by basalts and andesite. They are characterized by a depletion of Ti and enrichment of Fe, negative anomalies of Nb and Ta with abundance of HFSE as MORB, exhibiting typical island arc magmas. They may result from the southwestward subduction of the Junggar ocean plate. The Zr/Nb ratios of the picrites and basalts resemble the MORB, suggesting MORB-like sources. However, Ti/V and Zr/Sm ratios are higher than those of picrites, and the basalts display flat-type REE-chondrite patterns whereas the picrites are characterized by lower total REE concentrations and a slight enrichment of light REE. All suggest that the basalts were generated by lower partial melting of amphibole-bearing spinel peridotite, which was metasomatized by fluids released from the subducted oceanic crust, and the picrites resulted from the higher degree of partial melting of metasomatized garnet peridotite under high temperatures. The andesite may have resulted from the partial melting of eclogites.
- picrite,
- geochemistry,
- island arc,
- Middle Devonian,
- Altay orogenic belt.

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References(43)

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Middle Devonian Picrites of South Margin of Altay Orogenic Belt and Implications for Tectonic Setting and Petrogenesis

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