新疆阿尔泰东南缘哈拉乔拉镁铁质岩体地球化学特征与地质意义

夏昭德; 姜常义; 卢荣辉

doi:10.3799/dqkx.2012.102

Volume 37 Issue 5

Sep. 2012

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XIA Zhao-de, JIANG Chang-yi, LU Rong-hui, 2012. Geochemical Characteristics and Geologic Implications of Halaqiaola Mafic Intrusion, Southeast Altai, Xinjiang. Earth Science, 37(5): 937-946. doi: 10.3799/dqkx.2012.102

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XIA Zhao-de, JIANG Chang-yi, LU Rong-hui, 2012. Geochemical Characteristics and Geologic Implications of Halaqiaola Mafic Intrusion, Southeast Altai, Xinjiang. Earth Science, 37(5): 937-946. doi: 10.3799/dqkx.2012.102

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Geochemical Characteristics and Geologic Implications of Halaqiaola Mafic Intrusion, Southeast Altai, Xinjiang

doi: 10.3799/dqkx.2012.102

XIA Zhao-de^{1, 2
,},
JIANG Chang-yi^{1, 2},
LU Rong-hui^{1, 3}

1.
College of Earth Science and Resources, Chang'an University, Xi'an 710054, China
2.
Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an 710054, China
3.
Sichuan Huayuan Mining Exploitation Limited Liability Company, Chengdu 610072, China

Received Date: 2011-11-09
Available Online: 2021-11-10
Publish Date: 2012-09-15

Abstract

Abstract

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 TiO₂ (0.09%-1.28%) and alkali (Na₂O+K₂O=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.
- Halaqiaola,
- mafic,
- primary magma,
- magma evolution,
- lithosphere mantle,
- petrology,
- geochemistry

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References(29)

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Geochemical Characteristics and Geologic Implications of Halaqiaola Mafic Intrusion, Southeast Altai, Xinjiang

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