湖南安化大溶溪白钨矿床侧伏规律研究及意义  

Study on the Lateral Trending Regularity and Its Significance of Darongxi Scheelite Deposit in Anhua,Hunan Province

作　　者：余应龙 周岳强 董玉宁 时承华 YU Yinglong;ZHOU Yueqiang;DONG Yuning;SHI Chenghua(Hunan Nonferrous Metal Industry&Investment Group Co.,Ltd.,Changsha 410129,Hunan,China;Hunan Institute of Geological Disaster Investigation and Monitoring,Changsha 410004,Hunan,China;Hunan Chenzhou Mining Co.,Ltd.,Huaihua 419605,Hunan,China)

机构地区：[1]湖南有色产业投资集团有限责任公司,湖南长沙410129 [2]湖南省地质灾害调查监测所,湖南长沙410004 [3]湖南辰州矿业有限责任公司,湖南怀化419605

出　　处：《黄金科学技术》2023年第2期252-261,共10页Gold Science and Technology

基　　金：湖南省自然资源厅科技项目“湘东北金矿深部成矿规律及找矿方向研究”(编号:2020-13);国家自然科学基金项目“江南古陆金(多金属)大规模成矿的机理研究”(编号:41930428)联合资助。

摘　　要：湖南安化大溶溪白钨矿床位于湘西金锑钨成矿带,赋存于大神山岩体外接触带,是湘西地区最为重要的大型钨矿床。为了深入了解大溶溪白钨矿的矿床成因类型,以大溶溪白钨矿床开发期收集的大量基础资料和9个中段1997个钨样品测试数据为基础,通过对数据进行统计和可视化分析,研究大溶溪白钨矿的矿体侧伏规律,并据此进行反向推演,探讨了大溶溪白钨矿的成矿作用过程及其与大神山岩体之间的关系。研究表明:大溶溪白钨矿的矿体侧伏方向为NE(42°),受大神山岩体控制;成矿物质主要来源于南沱砂岩组,大神山岩体为其活化、迁移和再富集提供了热力场和动力场。结合前人研究成果,认为大神山岩体北部界山区域和南部白沙溪区域均位于大神山岩体热力场范围内,成矿条件与大溶溪白钨矿床相似,具有良好的成矿前景,建议进一步探寻深部隐伏矿体。It is very important to study the lateral trending regularity of orebodies for metallogenic prediction,especially the factors controlling the lateral direction.However,previous studies mostly focused on orebodies controlled by faults,and regularity of orebodies controlled by stratum remains poorly understood.The Darongxi scheelite deposit in Anhua,Hunan Province is the most economically important scheelite deposit in the Au-Sb-W metallogenic belt in western Hunan,the historical mining and current reserves are 38146 t WO3.This deposit occurs in Sinian Nantuo sandstone in the outer contact zone of the Dashenshan rock mass.The thickness of four scheelite orebodies in the deposit is 1.12~5.96 m,and the grade is 0.12%~1.02%WO3,which is similar to the occurrence wall rock of the Sinian Nantuo sandstone.The lateral trending regularity of the orebodies is still unclear,and the genesis of this deposit has been controversial.Based on comprehensive analysis of statistics,visualization and analysis on a large number of original basic data during the development and utilization period of the Darongxi scheelite deposit and 1997 scheelite samples from 9 middle sections,the lateral trending regularity of orebodies was studied,and the mineralization process of Darongxi scheelite deposit and its relationship with Dashenshan rock mass were discussed.It is considered that the pitch direction of orebody is NE(42°)and it is controlled by Dashenshan rock mass.The western boundary of the scheelite enrichment area shows a similar shape to that of the Dashenshan rock mass.The slope at the west boundary is more disordered,while those at the east boundary fall off a cliff from≥0.4%in the west of the boundary to<0.2%in the east.Moreover,the eastern boundary of the enriched orebodies is more than 200 meters away from the Dashenshan rock mass.The ore-forming materials of the Darongxi scheelite deposit are considered to be mainly derived from the sandstone of Nantuo Formation,and the Dashenshan rock mass provides a thermal and dynamic field

关 键 词：白钨矿床 侧伏规律 岩浆热力场 矿床成因 湘西金锑钨成矿带 江南古陆 

分 类 号：P614[天文地球—矿床学]