| 东昆仑巴隆河西金矿地质特征与找矿标志 |
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| 引用本文： | 王治安.东昆仑巴隆河西金矿地质特征与找矿标志[J].地质与勘探,2023,59(3):533-544. |
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| 作者姓名： | 王治安 |
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| 作者单位： | 青海省第五地质勘查院，青海西宁； 青海黄河矿业有限责任公司，青海西宁；中国科学院地质与地球物理研究所，北京 |
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| 基金项目： | 青海省国土资源厅“青海省都兰县巴隆河西金多金属矿预查”项目（编号：青地调社[2017]45号）资助 |
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| 摘 要： | 巴隆河西金矿床是东昆仑金成矿带近年来新发现的金矿床,其形成时代、地质特征与矿床类型尚不明确。本次在详细野外地质调查的基础上,通过构造-蚀变填图、锆石U-Pb定年和综合对比等方法,研究巴隆河西矿床的成矿特征和岩体侵位时代,以确定该矿床的成因类型与成矿时代。构造-蚀变填图发现巴隆河西矿床的金矿化赋存于花岗质岩体的9条构造蚀变带,明确了5个金矿体呈带状分布于北西西向断裂中,揭示金矿化与高岭土化、褐铁矿化、硅化和黄铁矿化等蚀变密切相关。赋含金矿化的花岗闪长岩和花岗斑岩的锆石U-Pb定年结果表明,其侵位时代分别为202.5±1.8 Ma和222.1±1.1Ma,属于印支晚期,约束了巴隆河西金矿的形成时代。结合区域岩浆活动时限、巴隆金矿地质特征、矿体产状与中低温矿物组合特征,提出巴隆河西矿床为造山带型金矿,推断逆断层及其伴随的热液活动是巴隆河西矿床金元素活化、迁移和富集的关键因素,指出北西西向构造蚀变带是该区带金矿成矿的有利部位。
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| 关 键 词： | 东昆仑 巴隆河西 金矿 地质特征 找矿标志 U-Pb年代学 |
| 收稿时间： | 2021/8/17 0:00:00 |
| 修稿时间： | 2022/11/11 0:00:00 |
Geological characteristics and prospecting indicators of the Balonghexi gold deposit in East Kunlun |
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| Institution: | The Fifth Geological Exploration Institute of Qinghai Province, Xining, Qinghai; Qinghai Huanghe Mining Corporation,Xining, Qinghai; Institute of Geology and Geophysics Chinese Academy of Sciences, Beijing |
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| Abstract: | The Balonghexi gold deposit has been discovered in the East Kunlun gold metallogenic belt in recent years, and its metallognic age, geological characteristics and genetic type have yet to be determined. On the basis of detailed field investigations, this work conducted structure-alteration mapping, zircon U-Pb dating and comprehensive comparison to constrain the genetic type and metallogenic age of this gold deposit through the metallogenic characteristics and age of host rocks. The structure-alteration mapping suggests that the gold mineralization was hosted in nine structural alteration zones of the granitic intrusions, and reveals that five gold orebodies were distributed in the NWW-trending faults. The gold mineralization was in close relation to the alteration including kaolinization, limonitization, silicification, and pyritization. Zircon U-Pb dating indicates that the gold-bearing granodiorite and granite porphyry rock were emplaced at 202±1.8 Ma and 222±1.1 Ma, respectively. The ages suggest the intrusions were formed by multiple Indosinian magmatic activities, which constrain the age of gold mineralization. In combination with the regional magmatic activities and the geological characteristics, orebody occurrence, and the medium- to low-temperature mineral assemblages, the Balonghexi deposit is inferred to be an orogenic-type gold deposit. The reverse fault and its accompanying hydrothermal activities are the key factors for the dissolution, migration and enrichment of Au element in the Balonghexi deposit. The NWW-trending structural alteration zone is a favorable location for gold mineralization in this area. |
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| Keywords: | East Kunlun Balonghexi gold deposit geological characteristics prospecting indicators U-Pb chronology |
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