|Table of Contents|

Mineralogical Characteristics of Pyroxenes from Tulargen Mafic-ultramafic Intrusion in East Tianshan, China and Their Geological Significance(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第04期
Page:
445-458
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Mineralogical Characteristics of Pyroxenes from Tulargen Mafic-ultramafic Intrusion in East Tianshan, China and Their Geological Significance
Author(s):
LIU Yan-rong1; 2;  LYU Xin-biao3;  LIU Min-wu1; 2;  LUAN Yan1; 2;  WANG Fu-gui4
(1. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China; 2. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education,Chang’an University, Xi’an 710054, Shaanxi, China; 3. School of Earth Resources, China University of Geosciences, Wuhan 430074, Hubei, China; 4. The Third Institute of Geological and Mineral Exploration, Gansu Provincial Bureau of Geology and Mineral Resources, Lanzhou 730050, Gansu, China)
Keywords:
mafic-ultramafic intrusion;  pyroxene;  geothermobarometer;  primary magma;  partial melting;  fractional crystallization;  crustal contamination;  East Tianshan
PACS:
P588.12; P57
DOI:
-
Abstract:
Tulargen mafic-ultramafic intrusion in East Tianshan is composed mainly of amphibole peridotite facies, pyroxene peridotite facies and gabbro facies. Pyroxene, the major rock-forming mineral of the intrusion, is present in almost every lithofacies. In order to have a better understanding of the nature, origin and evolution of the intrusion, the compositions of pyroxene by EPMA and LA-ICPMS were analyzed. The orthopyroxenes from Tulargen mafic-ultramafic intrusion in East Tianshan are bronzites, and the clinopyroxenes are composed of diopside and endiopside. The crystallization temperatures of the pyroxene are from 978 ℃ to 1 059 ℃, and the crystallization pressures range mainly from 0.71 kbar to 4.80 kbar. The primary magma of Tulargen intrusion is sub-alkaline tholeiitic magma, and is the production of 13%-20% partial melting of the depleted mantle metasomated by a subducted slab. The chemical compositions of pyroxenes in different lithofacies change slightly, indicating that Tulargen intrusion experiences a low degree of fractional crystallization, and the crystallization degree of the gabbro facies is slightly higher than that of the amphibole peridotite facies and pyroxene peridotite facies. The gabbro facies and peridotite facies are contaminated by Al-rich and Si-rich rocks, respectively. The fractional crystallization and contamination of Si-rich rocks could be responsible for the sulfur saturation and sulfide segregation.

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Last Update: 2019-07-11