内蒙古红彦镇地区山神府花岗岩熔融-流体包裹体特征及其成矿意义

毛晨; 吕新彪; 陈超; 曹明雨; 衮民汕; 廖鹏程; 贾启元

doi:10.3799/dqkx.2016.011

Volume 41 Issue 1

Jan. 2016

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Article Navigation > Earth Science > 2016 > 41(1): 139-152

Mao Chen, Lü Xinbiao, Chen Chao, Cao Mingyu, Gun Minshan, Liao Pengcheng, Jia Qiyuan, 2016. Characteristics and Metallogenic Significance of Melt-Fluid Inclusions of Shanshenfu Granite in the Hongyan Area, Inner Mongolia. Earth Science, 41(1): 139-152. doi: 10.3799/dqkx.2016.011

Citation:

Mao Chen, Lü Xinbiao, Chen Chao, Cao Mingyu, Gun Minshan, Liao Pengcheng, Jia Qiyuan, 2016. Characteristics and Metallogenic Significance of Melt-Fluid Inclusions of Shanshenfu Granite in the Hongyan Area, Inner Mongolia. Earth Science, 41(1): 139-152. doi: 10.3799/dqkx.2016.011

Citation:

Mao Chen, Lü Xinbiao, Chen Chao, Cao Mingyu, Gun Minshan, Liao Pengcheng, Jia Qiyuan, 2016. Characteristics and Metallogenic Significance of Melt-Fluid Inclusions of Shanshenfu Granite in the Hongyan Area, Inner Mongolia. Earth Science, 41(1): 139-152. doi: 10.3799/dqkx.2016.011

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Characteristics and Metallogenic Significance of Melt-Fluid Inclusions of Shanshenfu Granite in the Hongyan Area, Inner Mongolia

doi: 10.3799/dqkx.2016.011

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2015-06-25
Publish Date: 2016-01-15

Abstract

Abstract

This study investigates the characteristics of the fluid and its mineralization potential in magmatic-hydrothermal phase by the inclusions study of the Shanshenfu granite located in the Hongyan area, Inner Mongolia. The study shows that the inclusions of the Shanshenfu granite can be divideddevided into three types includingof melt inclusions, melt-fluid inclusions and fluid inclusions. The presence of melt-fluid inclusions indicates that granitic magma has experiencedgot through magmatic-hydrothermal transition stage, which is confirmed by the large changes in homogenization temperatures (from 281 ℃ to > 550 ℃) and the salinities(from 1.1% NaCl eqv to > 66.8% NaCl eqv) from rock center lithofaciesphase to edge lithofaciesphase. We use inclusion isochors of different homogenization temperatures and salinitiesy together with water-saturated solidus of granitic magma to estimate the temperatures and pressures of exsolved fluids. Considering that the three-phase inclusions containing CO₂ have a good limitation to the smallest emplacement pressure, we estimate that the smallest emplacement depth of Shanshenfu granite of range 7.6-9.5 km, exsolution temperature and depth of range 580-700 ℃ and 6.0-14.9 km, respectively. Laser-Raman characteristics of inclusions show that the solid phases of melt-fluid inclusions contain strong oxidation substances such as barite, azurite and hematite, which indicates the strong oxidation in magmatic-hydrothermal system that is very beneficial for Cu enriched in the exsolved fluids under the conditions of high-pressure, high-temperature and high-salinity. Combined with the wild in situ mineralized alteration characteristics, we conclude that the Shanshenfu area has good mineralization potential to form magmatic-hydrothermal deposit of Cu.
- Shanshenfu granite,
- melt-fluid inclusions,
- magmatic-hydrothermal transition,
- strong oxidation,
- mineralization potential,
- petrology

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References(67)

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Characteristics and Metallogenic Significance of Melt-Fluid Inclusions of Shanshenfu Granite in the Hongyan Area, Inner Mongolia

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