西藏冈底斯带始新世曲水岩基的岩浆混合作用:来自斜长石阴极发光特征和成分变化的证据

阮冰; 骆必继; 张宏飞; 郭亮; 徐旺春; 赵新福; 张文; 郭京梁

doi:10.3799/dqkx.2018.397

Volume 44 Issue 6

Jun. 2019

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Ruan Bing, Luo Biji, Zhang Hongfei, Guo Liang, Xu WangChun, Zhao Xinfu, Zhang Wen, Guo Jingliang, 2019. Magma Mixing of the Eocene Quxu Batholith from the Gangdese Magmatic Belt, South Tibet: Evidence from Cathodoluminescence Characteristics and Composition Changes of Plagioclase. Earth Science, 44(6): 1834-1848. doi: 10.3799/dqkx.2018.397

Citation:

Ruan Bing, Luo Biji, Zhang Hongfei, Guo Liang, Xu WangChun, Zhao Xinfu, Zhang Wen, Guo Jingliang, 2019. Magma Mixing of the Eocene Quxu Batholith from the Gangdese Magmatic Belt, South Tibet: Evidence from Cathodoluminescence Characteristics and Composition Changes of Plagioclase. Earth Science, 44(6): 1834-1848. doi: 10.3799/dqkx.2018.397

Citation:

Ruan Bing, Luo Biji, Zhang Hongfei, Guo Liang, Xu WangChun, Zhao Xinfu, Zhang Wen, Guo Jingliang, 2019. Magma Mixing of the Eocene Quxu Batholith from the Gangdese Magmatic Belt, South Tibet: Evidence from Cathodoluminescence Characteristics and Composition Changes of Plagioclase. Earth Science, 44(6): 1834-1848. doi: 10.3799/dqkx.2018.397

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Magma Mixing of the Eocene Quxu Batholith from the Gangdese Magmatic Belt, South Tibet: Evidence from Cathodoluminescence Characteristics and Composition Changes of Plagioclase

doi: 10.3799/dqkx.2018.397

Ruan Bing^{1,3
,
,},
Luo Biji^{1,3
,
,
,},
Zhang Hongfei^1,3,
Guo Liang^1,3,
Xu WangChun^1,3,
Zhao Xinfu^2,3,
Zhang Wen³,
Guo Jingliang^1,3

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
State Key Laborayory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-09-30
Publish Date: 2019-06-15

Abstract

Abstract

As the main rock-forming mineral, plagioclase is an effective tool for studying petrogenesis, magma evolution and magma mixing. The cathodoluminescence image, electron probe micro-analysis and LA-ICP-MS composition analysis were carried out for the plagioclase from the granodiorite, monzogranite, diorite dykes and mafic microgranular enclaves (MMEs) in the Quxu batholith in the Gangdese magmatic belt, which can reveal the formation mechanisms and relative magma evolution process of plagioclase complex zoning. The cathodoluminescence images of the plagioclase from the Quxu batholith shows that their color displays a corresponding relationship with the An value. With the decreasing with the An values, the colors are green, blue and dark gray or dark red in turn. The plagioclases have obvious three types of zoning:patchy zonation, sieve texture and oscillatory zoned. The An values of plagioclase from the Quxu granodiorite and monzonite have similar ranges (20-55), while the An values in diorite dikes and MMEs vary widely (25-85), all indicating that the Quxu batholith has undergone a complex opening process. Insitu trace elements analyses show that the granodiorite has similar Sr content (600×10^-6-1 100×10^-6) with the diorite dykes and MMEs; the Sr content of monzogranite (1 000×10^-6-2 400×10^-6) is higher than the granodiorite, diorite dykes and MMEs. The above studies show that:the green luminescence of cores and mantle in granodiorite is the result of the mixing of the intermediate magma and felsic magma; the high Sr content of monzogranite is considered to be derived from a Sr-enriched melt. The above studies show that the complex zonings of the plagioclase are the result of the injection of mafic magma into felsic magma. The core of sieve texture plagioclase in diorite vein and MMEs could be xenocrystals, which are captured from the host rocks.
- Quxu batholith,
- plagioclase,
- cathodoluminescence image analysis,
- magma evolution,
- magma mixing,
- petrology

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References(52)

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Magma Mixing of the Eocene Quxu Batholith from the Gangdese Magmatic Belt, South Tibet: Evidence from Cathodoluminescence Characteristics and Composition Changes of Plagioclase

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