新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义

周刚; 张招崇; 杨文平; 谷高中; 张小林; 罗世宾; 王祥

Volume 30 Issue 6

Jun. 2005

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Article Navigation > Earth Science > 2005 > 30(6): 738-746

ZHOU Gang, ZHANG Zhao-chong, YANG Wen-ping, GU Gao-zhong, ZHANG Xiao-lin, LUO Shi-bin, WANG Xiang, 2005. Metabasic Rock on the South Side of Mayin'ebo Fault in the South Margin of Altay Mountains, Xinjiang, and Its Geological Implications. Earth Science, 30(6): 738-746.

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Metabasic Rock on the South Side of Mayin'ebo Fault in the South Margin of Altay Mountains, Xinjiang, and Its Geological Implications

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

Received Date: 2005-07-02
Publish Date: 2005-11-25

Abstract

Abstract

The Areletuobie metabasic rocks occur in the Lower Carboniferous Jiangbasitao Formation, which consists of sedimentary fine clastic sequences on the south side of the Ertix-Mayin'ebo deep-large fault that marks the boundary between the Altay and Junggar orogenic belts. The metabasic rocks display relatively high TiO₂ (1.15%-2.20%) and MgO contents (7.03%-9.54%), and relatively low SiO₂ (45.72%-48.31%) and K₂O contents (0.13%-0.41%). They exhibit slight LREE enrichment on the chondrite-normalized REE patterns without Eu anomalies. Their MORB-normalized trace element patterns are characterized by large ion lithophile element (LILE) enrichment with significantly positive Th anomalies, slightly negative Nb anomalies and high Nb concentrations (2.6×10^-6-8.7×10^-6), whereas their high field strength element (HFSE) contents resemble those of MORB. The Zr/Nb ratios range from 18.9 to 32.7, similar to those of MORB. In contrast, their Ti/V ratios are higher than those of MORB. All of these features suggest that they were generated by relatively low degrees of melting of MORB-like depleted mantle source. Their ε_Nd(t) values range from 7.40 to 8.35, lower than those of MORB, but higher than those rocks derived from oceanic island and intracontinental basalts. Consequently, the metabasic rocks have the somewhat transitional features of the volcanic rocks between a volcanic arc and an oceanic island. It is therefore inferred that they were formed from a back-arc basin, and represent the products in the early stage of back-arc basin spreading.
- metabasic rock,
- geochemistry,
- back-arc basin,
- Ertix-Mayin'ebo suture zone

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Metabasic Rock on the South Side of Mayin'ebo Fault in the South Margin of Altay Mountains, Xinjiang, and Its Geological Implications

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