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青海省都兰县沟里地区金矿床地质特征及成因
- 马冬|孙国胜|李雪|韩雷|张纪田|刘根驿
- 作者单位：
- 吉林大学地球科学学院|吉林大学地球科学学院|吉林大学地球科学学院|中国石油化工股份有限公司东北油气分公司|华东冶金地质勘查研究院|山东省物化探勘查院
基金项目：
- 中国地质调查局发展研究中心项目（DD20190159-06）
详细信息：
- 作者简介：
- 马冬（1997—），男，宁夏吴忠人，硕士研究生，研究方向为地球化学；长春市建设街2199号，吉林大学地球科学学院，130061；E-mail:951959598@qq.com
- 通讯作者：
- E-mail：691836152@qq.com，13654391463
- PDF下载
Geological characteristics and genesis of gold deposits in the Gouli area,Dulan County,Qinghai Province
- English Author：
- College of Earth Sciences,Jilin University|College of Earth Sciences,Jilin University|College of Earth Sciences,Jilin University|Northeast Oil & Gas Branch of SINOPEC|East-China Metallurgical Institute of Geology and Exploration|Shandong Institute of Geophysical and Geochemical Exploration
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
沟里地区是东昆仑构造带东段重要的金矿集区，目前其内已发现了果洛龙洼、阿斯哈、瓦勒尕等一系列以金为主的大、中型矿床及众多金矿点。通过对沟里地区阿斯哈、果洛龙洼和瓦勒尕3个典型金矿床地质特征进行综合研究，结果表明：沟里地区金矿床的形成时代主要为印支晚期，该时期剧烈的岩浆活动为金矿床形成提供了物源和热源；成矿作用受控于断裂，其中昆中断裂及其次级香日德—德龙断裂是主要导矿、控矿构造，低序次北东向和北西向断裂是最主要的容矿构造；成矿流体总体为中低温度（130.0 ℃~360.0 ℃）、中低盐度（1.83 ％~18.00 ％）及低密度（0.62~1.03 g/cm3）的H2O-CO2-NaCl-CH4流体体系。矿石氢、氧、硫和铅同位素研究结果显示，成矿物质来源于造山带岩浆作用，成矿流体早期主要为岩浆水，晚阶段有大气降水混入。沟里地区金矿床成因类型为与印支晚期造山运动有关的造山型。
关键词:
东昆仑构造带；金矿床；地质特征；矿床成因；造山型金矿床
Abstract:
Gouli area is an important gold ore concentration area in the eastern section of the East Kunlun tectonic belt.At present,a series of large and medium-sized gold deposits and many gold spots have been found in the area,such as Guoluolongwa,Asha,and Walega.A comprehensive study on the geological characteristics of the 3 typical deposits,namely Asha,Guoluolongwa,and Walega in the Gouli area.The results show that the gold deposits in the Gouli area were mainly formed in the late Indosinian period,during which the intense magmatic activity provided materials and heat source for the formation of gold deposits;the mineralization is controlled by fault structures,among which Kunzhong fault and its secondary Xiangride-Delong fault are the main ore-guiding and ore-controlling structures,while the lower order NE and NW faults are the main ore-hosting structures;the ore-forming fluid of the gold deposits in Gouli area is the fluid system of H2O-CO2-NaCl-CH4 with medium to low temperature (130.0 ℃-360.0 ℃),medium to low salinity (1.83 ％-18.00 ％) and low density (0.62-1.03 g/cm3).The study of H,O,S,and Pb isotopes of ores shows that the ore-forming materials are derived from the magmatism of the orogenic belt,and the ore-forming fluids are mainly magmatic water in the early stage,mixed with atmospheric precipitation in the late stage.The genetic type of gold deposits in the Gouli area is orogenic gold deposits related to late Indosinian orogeny.
Keywords:
East Kunlun tectonic belt;gold deposit;geological characteristics;the genesis of deposit;orogenic gold deposit
