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Oxygen Isotope Characteristics of the Footwall Alteration Zones in the Hongtoushan Volcanogenic Massive Sulfide Deposit, Liaoning Province, China and Restoration of Their Formation Temperatures
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This study was supported financially by the National Basic Research Program of the People’s Republic of China (2006CB403501), and the National Natural Science Foundation of China (Nos 40872050, 40872064).


Oxygen Isotope Characteristics of the Footwall Alteration Zones in the Hongtoushan Volcanogenic Massive Sulfide Deposit, Liaoning Province, China and Restoration of Their Formation Temperatures
Author:
  • ZHENG Yuanchuan

    ZHENG Yuanchuan

    1 Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China； 2 State Key Laboratory for Endogenic Metal Deposits Research (Nanjing University); Department of Earth Sciences, Nanjing University, Nanjing 210093, China
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  • GU Lianxing

    GU Lianxing

    1 Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China； 2 State Key Laboratory for Endogenic Metal Deposits Research (Nanjing University); Department of Earth Sciences, Nanjing University, Nanjing 210093, China
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  • TANG Xiaoqian

    TANG Xiaoqian

    1 Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China； 2 State Key Laboratory for Endogenic Metal Deposits Research (Nanjing University); Department of Earth Sciences, Nanjing University, Nanjing 210093, China
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  • LIU Sihai

    LIU Sihai

    1 Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China； 2 State Key Laboratory for Endogenic Metal Deposits Research (Nanjing University); Department of Earth Sciences, Nanjing University, Nanjing 210093, China
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  • WU Changzhi

    WU Changzhi

    1 Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China； 2 State Key Laboratory for Endogenic Metal Deposits Research (Nanjing University); Department of Earth Sciences, Nanjing University, Nanjing 210093, China
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  • LI Chunhai

    LI Chunhai

    1 Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China； 2 State Key Laboratory for Endogenic Metal Deposits Research (Nanjing University); Department of Earth Sciences, Nanjing University, Nanjing 210093, China
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Fund Project:

This study was supported financially by the National Basic Research Program of the People’s Republic of China (2006CB403501), and the National Natural Science Foundation of China (Nos 40872050, 40872064).

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    摘要:

    The Hongtoushan Volcanogenic Massive Sulphide Deposit (VMSD) occurs in the Hunbei granite-greenstone terrane, Liaoning Province, NE China. Rocks in the mining area have been metamorphosed around 3.0–2.8 Ga to upper amphibolite facies at temperatures between 600°C and 650°C. Cordierite-anthophyllite gneiss (CAG) in the Hongtoushan mining area, which occurs hundreds of meters below the ore horizon, corresponds to the metamorphosed semi-conformable alteration zone of the VMSD hydrothermal system, whereas the one immediately below the main ore layer represents the metamorphosed pipe-like alteration zone. Whole-rock oxygen isotope signatures were well preserved in both types of CAGs, although the mineral components have been entirely changed during regional metamorphism. Therefore, whole-rock oxygen isotopes can be used to estimate the formation temperature of both types of alteration zone. Calculations show that the semi-conformable and pipe-like alteration zones for the Hongtoushan submarine hydrothermal system were formed at 290–360°C and 285–320°C, respectively, whereas estimates for the former were slightly higher than that of the latter, indicating that the semi-conformable alteration zone represents the deep part of the Hongtoushan seafloor hydrothermal system, while the pipe-like alteration zone represents the discharge conduits for metal-rich fluids, which is closer to the seafloor.

    Abstract:

    The Hongtoushan Volcanogenic Massive Sulphide Deposit (VMSD) occurs in the Hunbei granite-greenstone terrane, Liaoning Province, NE China. Rocks in the mining area have been metamorphosed around 3.0–2.8 Ga to upper amphibolite facies at temperatures between 600°C and 650°C. Cordierite-anthophyllite gneiss (CAG) in the Hongtoushan mining area, which occurs hundreds of meters below the ore horizon, corresponds to the metamorphosed semi-conformable alteration zone of the VMSD hydrothermal system, whereas the one immediately below the main ore layer represents the metamorphosed pipe-like alteration zone. Whole-rock oxygen isotope signatures were well preserved in both types of CAGs, although the mineral components have been entirely changed during regional metamorphism. Therefore, whole-rock oxygen isotopes can be used to estimate the formation temperature of both types of alteration zone. Calculations show that the semi-conformable and pipe-like alteration zones for the Hongtoushan submarine hydrothermal system were formed at 290–360°C and 285–320°C, respectively, whereas estimates for the former were slightly higher than that of the latter, indicating that the semi-conformable alteration zone represents the deep part of the Hongtoushan seafloor hydrothermal system, while the pipe-like alteration zone represents the discharge conduits for metal-rich fluids, which is closer to the seafloor.

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ZHENG Yuanchuan, GU Lianxing, TANG Xiaoqian, LIU Sihai, WU Changzhi, LI Chunhai.2011. Oxygen Isotope Characteristics of the Footwall Alteration Zones in the Hongtoushan Volcanogenic Massive Sulfide Deposit, Liaoning Province, China and Restoration of Their Formation Temperatures[J]. ACTA GEOLOGICA SINICA(English edition),85(3):683~693

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  • 收稿日期:2010-12-01
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