| 胶东水旺庄金矿床成矿机制:来自S-H-O同位素和流体包裹体的制约 |
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| 引用本文： | 李杰,张丽鹏,宋明春,梁金龙,李世勇,宋英昕,鲍中义,丁正江.胶东水旺庄金矿床成矿机制:来自S-H-O同位素和流体包裹体的制约[J].地球科学,2021,46(5):1569-1584. |
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| 作者姓名： | 李杰 张丽鹏 宋明春 梁金龙 李世勇 宋英昕 鲍中义 丁正江 |
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| 作者单位： | 河北地质大学河北省战略性关键矿产资源重点实验室,河北石家庄 050031;河北地质大学地球科学学院,河北石家庄 050031;中国科学院海洋研究所深海研究中心,山东青岛 266071;中国科学院海洋研究所深海研究中心,山东青岛 266071;山东省第六地质矿产勘查院,山东威海 264209;成都理工大学地球科学学院,四川成都 610059;山东省物化探勘查院,山东济南 250013;山东省地质科学研究院,山东济南 250013;山东省地质矿产勘查开发局,山东济南 250013 |
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| 基金项目： | 河北省自然科学基金面上项目D2020403061河北省自然科学基金面上项目D2020403019国家自然科学基金山东省联合基金项目U2006201国家自然科学基金面上项目41973048山东省地勘基金项目202017泰山学者建设工程专项经费ts201511076 |
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| 摘 要： | 为探讨胶东水旺庄金矿床成因，对载金黄铁矿和石英进行了S-H-O同位素组成及流体包裹体的测试分析，研究表明:黄铁矿δ34S介于7.0‰~8.5‰，流体的δD介于-91.7‰~-82.6‰，δ18O介于2.6‰~5.6‰，发育气-液两相流体包裹体、含CO2流体包裹体和含子矿物流体包裹体等3类，流体盐度介于1.2%~13.8%（NaCleq），均一温度主要集中于290~350 ℃，成矿期流体为中高温、低盐度的H2O-CO2-NaCl±CH4体系，具有深部岩浆来源特征.流体的不混溶或沸腾作用导致了金的沉淀富集.受中生代太平洋板块俯冲及后撤影响，胶东地区发生了大规模岩浆活动和强烈的地壳隆升，所产生的热隆-伸展构造为该区大规模金矿集中爆发成矿提供了有利条件.在主拆离断层中主要形成破碎带蚀变岩型金矿床，在主拆离断层下盘主要形成石英脉型金矿床.
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| 关 键 词： | 水旺庄金矿床 S同位素 H-O同位素 流体包裹体 胶东半岛 矿床地质 |
| 收稿时间： | 2020-08-17 |
Formation Mechanism of Shuiwangzhuang Gold Deposit in Jiaodong Peninsula: Constraints from S-H-O Isotopes and Fluid Inclusions |
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| Li Jie,Zhang Lipeng,Song Mingchun,Liang Jinlong,Li Shiyong,Song Yingxin,Bao Zhongyi,Ding Zhengjiang.Formation Mechanism of Shuiwangzhuang Gold Deposit in Jiaodong Peninsula: Constraints from S-H-O Isotopes and Fluid Inclusions[J].Earth Science-Journal of China University of Geosciences,2021,46(5):1569-1584. |
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| Authors: | Li Jie Zhang Lipeng Song Mingchun Liang Jinlong Li Shiyong Song Yingxin Bao Zhongyi Ding Zhengjiang |
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| Abstract: | In order to discuss the genesis of the Shuiwangzhuang gold deposit in Jiaodong Peninsula, S-H-O isotopic compositions of gold-bearing pyrite and quartz were carried out, and the fluid inclusions in quartz during ore-forming period were analyzed in this study. The results show that the δ34S of pyrite ranges from 7.0‰ to 8.5‰, with an average value of 7.7‰. The sulfur may be mainly from mantle sulfur and mixed with a small amount of crust sulfur. The δD of fluid in quartz ranges from -91.7 ‰ to -82.6 ‰, and δ18OH2O ranges from 2.6 ‰ to 5.6 ‰, indicating that the ore-forming fluid is mainly magmatic water, and meteoric water was mixed in at the later stage of mineralization. Three types of fluid inclusions in quartz are recognized during the main metallogenic period, including gas-liquid two-phase fluid inclusions, CO2-bearing fluid inclusions, and liquid rich fluid inclusions with daughter mineral. The salinity of fluid is between 1.2% and 13.8% (NaCleq), and the homogenization temperature is mainly concentrated between 290 and 350 ℃, indicating the main ore-forming fluid is H2O-CO2-NaCl±CH4 system with medium-high temperature and low salinity. The immiscibility (phase separation) or boiling of fluid leads to the precipitation and enrichment of gold. In the Mesozoic, under the influence of the subduction and rollback of the paleo-Pacific plate, large-scale magmatic activities and strong crustal uplift occurred in Jiaodong Peninsula, and the resulting thermal uplift-extensional structure provided favorable conditions for the concentrated mineralization of large-scale gold deposits. In the main detachment fault, the high degree of rock fragmentation is conducive to atmospheric water infiltration, circulation and mixing with deep fluid to form altered rock type gold deposit in fracture zone. In the footwall of main detachment fault, the fracture scale is small and the connectivity with the surface is poor, which is not conducive to the infiltration of meteoric water. The ore-forming fluid is mainly deep-source fluid, forming quartz vein type gold deposit. |
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