若羌盖吉克萤石矿地质特征及成矿构造环境分析
Geological Characteristics and Ore-Forming Tectonic Environment Analysis of the Gaijike Fluorite Deposit in Ruoqiang County,Xinjiang
连政 1汪东 1殷豫江 1张小林2
作者信息
- 1. 新疆地质矿产勘查开发局第一区域地质调查大队,新疆 乌鲁木齐 830010
- 2. 中国建筑材料工业地质勘查中心新疆总队,新疆 乌鲁木齐 830099
- 折叠
摘要
盖吉克萤石矿床位于阿尔金山中段,沿NEE向展布,受盖吉克断裂控制.含矿岩石为萤石方解石脉、正长花岗岩,含萤石正长花岗岩属高钾钙碱性系列"Ⅰ"型花岗岩类.在盖吉克萤石矿北部卡尔恰尔萤石矿区含萤石正长花岗岩中获得ICP锆石U-Pb年龄为(468±16)Ma,结合区域构造背景、区域成岩成矿年代学研究及岩石地球化学特征,认为盖吉克萤石矿产于碰撞造山后构造环境,是伴随着陆内持续俯冲阿中地块和柴达木地块由挤压造山转变为伸展构造背景的产物,成矿时代为中晚奥陶世.
Abstract
The Gaijike fluorite deposit is located in the middle section of the Altun Mountains,and is produced in the northeast oriented Gaijike fault zone.It is controlled by the fault structure.There are four fluorite ore bodies delineated on the surface of the mining area,with a length of 200-1300 meters and an average thickness of 3.90-10.00 meters.The average CaF2 grade is 30.15-40.17％,and the ore bearing rocks are fluorite calcite veins and syenogranite.The fluorite bearing syenogranite belongs to the high potassium calcium alkaline series Ⅰ type granite class.We conducted a 1:50 000 mineral survey and obtained an ICP zircon U-Pb age of 468±16 Ma from the fluorite bearing syenite granite in the Kar-qal fluorite mining area.Based on the regional tectonic background,regional diagenetic and mineralization chronology research,and rock geochemical characteristics,we believe that the Gaijike fluorite deposit originated from the post colli-sional tectonic environment of the Middle Ordovician,It is a product of the continuous subduction of the Azhong and Qa-idam blocks during landing,which transformed from a compressional orogeny to an extensional tectonic background.The mineralization era is consistent with that of the Karqal fluorite,and it is in the middle to late Ordovician.
关键词
若羌县/盖吉克萤石矿/地质特征/成矿构造环境/成矿时代Key words
Ruoqiang County/Gaijike fluorite mine/Gelogical characteristics/Metallogenic tectonic environment/Metallogenic epoch引用本文复制引用
基金项目
新疆维吾尔自治区地勘基金项目(K17-1-XJ04)
新疆萤石成矿规律和潜力评价(2023A03004-2)
出版年
2024
NETL
NSTL
万方数据