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西秦岭南部赵家庄金矿床地质特征及控矿因素分析
- 胡菲菲|张良|荆国强|李万华
- 作者单位：
- 核工业二〇三研究所|核工业二〇三研究所|核工业二〇三研究所|核工业二〇三研究所
基金项目：
- 中国核工业地质局勘查项目（201564,2020-19）
详细信息：
- 作者简介：
- 胡菲菲（1988—），女，陕西安康人，工程师，硕士，从事铀多金属矿勘查研究工作；陕西省西咸新区沣东新城科源三路869号，核工业二〇三研究所，710086；E-mail：313001701@qq.com
- 通讯作者：
- E-mail：466055188@qq.com，18191083856
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Geological characteristics and analysis of ore-controlling factors of Zhaojiazhuang Gold Deposit in the south of West Qinling
- English Author：
- No.203 Research Institute of Nuclear Industry|No.203 Research Institute of Nuclear Industry|No.203 Research Institute of Nuclear Industry|No.203 Research Institute of Nuclear Industry
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
赵家庄金矿床位于西秦岭南部，是近年来新发现的金矿床。矿区内金矿化主要产于三河口群浅变质碎屑岩中，北东东向F5断裂及其上下盘次级构造控制矿体的分布、形态及产出；矿体总体呈透镜状、似层状北东东向产出，倾向320°～20°，倾角50°～70°，长68～200 m，厚1.03～5.94 m，金品位3.04～8.04 g/t。矿石类型主要为构造蚀变岩型，载金矿物主要为黄铁矿，其次为闪锌矿、黄铜矿；矿石中金以自然金形式存在，可见金嵌布于金属矿物的晶隙及裂隙或包裹于脉石矿物中，不可见金在载金矿物中以Au0形式存在。综合分析认为，具有高金背景值的三河口群及下伏震旦系碧口群地层为赵家庄金矿床的矿源层；早侏罗世来自碰撞造山背景下的变质流体，上升运移并不断萃取地层中的成矿物质，在三河口群地层中富集成矿；印支期岩浆侵入的构造薄弱地段，为成矿流体运移和聚集提供了部分空间；后期碰撞造山过程中，由于脉岩与地层的物性差异，易在接触面附近形成韧性变形带，为成矿流体循环、聚集和金成矿提供有利空间。
关键词:
地质特征；矿体特征；矿石特征；控矿因素；赵家庄金矿床
Abstract:
Zhaojiazhuang Gold Deposit is located in the south of West Qinling,which is a newly discovered gold deposit in this area in recent years.Gold mineralization in the district mainly occurs in slightly metamorphosed clastic rocks of the Sanhekou Group.The distribution,morphology and output of gold ore bodies are controlled by the NEE-trending F5 fault and the secondary structure of its hanging wall and footwall.The gold ore bodies are mainly stratiform and lenticular in shape which strikes NEE-trending,with dips of 350°-20°,dip angles of 50°-70°,length of 68-200 m,thickness of 1.03-5.94 m and Au mean grade of 3.04-8.04 g/t.The type of ores is mainly tectonic altered rock type.Pyrite is the main gold-bearing mineral,followed by sphalerite and chalcopyrite.Gold in ores mainly exists in the form of natural gold,and visible gold is included in gangue minerals or embedded in metallic mineral crystal gaps and cracks,while invisible gold existed in gold-bearing minerals in the form of Au0.According to the comprehensive data analysis,the Devonian Sanhekou Group and the underlying Sinian Bikou Group with high gold background value are the source beds of the Zhaojiazhuang Gold Deposit;metamorphic fluids of early Jurassi from the background of collisional orogeny,which rose and continuously extracted the metallogenic materials in the strata,enriched the mineralization in Sanhekou Group;the weak structural section of Indosinian magma intrusion also provides part of the space for the migration and accumulation of ore-forming fluids;due to the difference in physical properties between the vein rock and the stratum,the later collisional orogenic process is easy to form a ductile deformation zone near the contact surface,which provides favorable space for the circulation and accumulation of ore-forming fluids and gold mineralization.
Keywords:
geological characteristics;ore body characteristics;ore characteristics;ore-controlling factors;Zhao-jiazhuang Gold Deposit