Geochemical characteristics and geologic implications of Halaqiaola mafic intrusion, southeast Altai, Xinjiang

被引：2

作者：

Xia, Zhao-De ^{[1
,2
]}

Jiang, Chang-Yi ^{[1
,2
]}

Lu, Rong-Hui ^{[1
,3
]}

机构：

[1] College of Earth Science and Resources, Chang'an University

[2] Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education

[3] Sichuan Huayuan Mining Exploitation Limited Liability Company

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2012年 / 37卷 / 05期

关键词：

Geochemistry; Halaqiaola; Lithosphere mantle; Mafic; Magma evolution; Petrology; Primary magma;

D O I：

10.3799/dqkx.2012.102

中图分类号：

学科分类号：

摘要：

Halaqiaola mafic intrusion lies in the southeast margin of the Altai orogenic belt in Xinjiang, northwestern China. The main rock types are gabbros, gabbro norite, plagioclase-bearing pyroxenite, olivine gabbro and troctolite. Halaqiaola intrusion has low contents of TiO 2 (0.09%-1.28%) and alkali (Na 2O+K 2O=0.37%-0.78%), and belongs to tholeiitic series; the intrusion is rich in large ion lithophile elements and light rare earth elements and depleted in high field elements (such as Nb, Ta). The ε Nd(t) and the ε Sr(t) values range from -2.62 to -0.78 and 37.49 to 45.28 respectively. Element geochemistry and Nd-Sr isotopic composition shows that the magma was derived from the dehydration of subducted plate and metasomatismed enriched lithosphere mantle. The primary magma of the intrusion is basaltic magma. During the process of magma evolution, the primary magma has experienced fractional crystallization of olivine, clinopyroxene and plagioclase, with ilmenite-precipitation in the late period.

引用

页码：937 / 946

页数：9

共 23 条

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