滇东南西畴曼龙沟金矿成矿规律及矿床成因
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摘要
曼龙沟金矿位于滇东南文山—富宁褶皱束西畴拱凹,是与加里东不整合接触面关系密切的金矿床。结合区域成矿背景、矿区地质工作成果,讨论了矿区及矿床地质特征,归纳总结了矿床成矿规律,并结合地表及坑、钻探工程验证成果,进一步分析了找矿方向。研究表明:①矿区地质构造发育,导矿构造、容矿构造具有显著的多级性、一致性和继承性特征,大堡滑覆体严格控制着矿体产出与空间展布,近SN向断裂(F_(15)、F_(16))、NWW向断裂(F_(17))与金矿化关系密切;②矿床层控性显著,成矿作用受构造活动控制,是我国滇东南地区典型的微细粒型热液金矿床;③强烈的围岩蚀变(硅化、黄铁矿化、毒砂化)及不整合面是有利的找矿标志,滑覆面揭露的金矿层是寻找高品位金矿(化)体的有利部位。
Manlonggou Gold Deposit in Southwest Yunnan Province is located in Xichou arch-concave of Wenshan-Fining folded belt,it belongs to the one that is mainly in close relations with unconformity surface of Caledonian.Based on the regional metalogenic geological background and geological working results of mining area,the geological characteristics of deposit are discussed,the metallgenic law is summarized,besides that,the prospecting direction of the mining area is studied based on the ground engineering verification results and pit drilling engineering verification results.The research results show that:①the ore-guiding structures and ore-hosting structures in the mining area are well developed and characterized by multilevel,consistency and inheritance,and the occurrence and spatial distribution is strictly controlled by Dabao gliding-nappe,the SN-trending fractures and NWW-trending fracture have close relationship with gold mineralization;②the mineralization of Manlonggou Deposit is strictly controlled by tectonic activity,which characterized by strata-bound type,it belongs to the one that carlin-type hydrothermal deposit in Southeast Yunnan Province;③the strong wall-rock alteration(silicification,pyritized and arsenopuritization) and unconformity surface are the favorable prospecting criterias,and the gold ore seam which exposed by surface of gliding-nappe can be ragarded as the favorable position of rich gold orebodies.
Manlonggou Gold Deposit in Southwest Yunnan Province is located in Xichou arch-concave of Wenshan-Fining folded belt,it belongs to the one that is mainly in close relations with unconformity surface of Caledonian.Based on the regional metalogenic geological background and geological working results of mining area,the geological characteristics of deposit are discussed,the metallgenic law is summarized,besides that,the prospecting direction of the mining area is studied based on the ground engineering verification results and pit drilling engineering verification results.The research results show that:①the ore-guiding structures and ore-hosting structures in the mining area are well developed and characterized by multilevel,consistency and inheritance,and the occurrence and spatial distribution is strictly controlled by Dabao gliding-nappe,the SN-trending fractures and NWW-trending fracture have close relationship with gold mineralization;②the mineralization of Manlonggou Deposit is strictly controlled by tectonic activity,which characterized by strata-bound type,it belongs to the one that carlin-type hydrothermal deposit in Southeast Yunnan Province;③the strong wall-rock alteration(silicification,pyritized and arsenopuritization) and unconformity surface are the favorable prospecting criterias,and the gold ore seam which exposed by surface of gliding-nappe can be ragarded as the favorable position of rich gold orebodies.
引文
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[9] 杨云保.滇东南地区微细粒金矿成矿探讨[J].地质与勘探,2004,40(3):31-35.
[2] 万方,许效松.川滇黔桂地区志留纪构造—岩相古地理[J].古地理学报,2003,5(2):180-186.
[3] 陈翠华,赵德坤,顾雪祥,等.云南老寨湾金矿床成矿物质来源探讨[J].矿物岩石地球化学通报,2014,33(1):23-30.
[4] 许翠芳,戴润芹.滇东南老寨湾金矿化探异常查证与找矿方向[J].云南地质,2010,29(1):25-28.
[5] 罗刚,杨小峰.云南广南地区老寨湾微细粒浸染型金矿床地质特征与成矿规律[J].地质通报,2010,29(9):1362-1370.
[6] 赵晖,金自钦,刘志斌,等.广南老寨湾金矿金的赋存状态研究[J].矿床地质,2016,36(4):31-37.
[7] 李宁,朱杰勇.滇东南西畴县鸡街金矿矿床地质特征及成因探讨[J].科学技术与工程,2014,14(18):156-162.
[8] 刘苏桥,陆刚,白艳萍,等.沉积间断断面型金矿产出模式及找矿方向-以桂西久隆金矿为例[J].桂林理工大学学报,2011,31(7):488-494.
[9] 杨云保.滇东南地区微细粒金矿成矿探讨[J].地质与勘探,2004,40(3):31-35.