湘南铜山岭矿田构造‒成矿特征以及深部成矿预测  

Tectono-metallogenic Characteristics and Deep Mineralization Prediction of the Tongshanling Ore Field in Southern Hunan Province

作　　者：宗琦[1,2] 孔华 吴堑虹 刘飚[1,2] 严家斌[1,2] 汤钰御 谭富诚[1,2] ZONG Qi;KONG Hua;WU Qianhong;LIU Biao;YAN Jiabin;TANG Yuyu;TAN Fucheng(MOE Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Changsha 410083,Hunan,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [2]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《大地构造与成矿学》2024年第5期948-963,共16页Geotectonica et Metallogenia

基　　金：国家重点研发计划项目(2018YFC060902,2018YFC060901,2018YFC060903)资助。

摘　　要：湘南铜山岭矿田位于南岭成矿带与钦杭成矿带的结合部位。本文采用构造解析、广域电磁探测、热液矿物地球化学分析等方法对铜山岭矿田1~3 km深度的构造‒岩浆‒成矿系统特征进行了综合研究。研究结果表明:①构造解析显示铜山岭矿田经历了三期构造事件,第一期为成矿前的NWW-SEE向挤压,形成NNE向褶皱和逆断层,以及NWW向张性断裂;第二期为成矿期的NW-SE向伸展,使部分NNE向逆断层转化为正断层,并伴随花岗岩体侵位以及矽卡岩型铜多金属成矿事件;第三期为成矿后的近SN向挤压,使NNE向断层发生左行走滑。成矿前形成的NNE向断层在成矿期重新活动,并成为矿田内主要的控岩控矿断层。②广域电磁法探测表明矿田覆盖区深部的隐伏花岗岩岩体与灰岩地层之间存在较大的物性差异,异常解译结果显示高阻体为花岗岩岩体,层状低阻体为灰岩地层,陡倾低阻体为区域性断层,其中高阻体与层状低阻体之间的过渡带是有利的成矿空间。③断层中发育两期方解石脉,其中第二期方解石脉的地球化学特征指示其与岩浆热液活动有关。基于以上研究我们在铜山岭矿田圈定两个深部成矿预测区。The Tongshanling ore field is located in the conjunction area of the Nanling and Qin-Hang metallogenic belts.To investigate the relationships among structures,granites,and mineralization systems within a depth interval of 1-3 km in the Tongshanling ore field,we carried out structural analysis,wide-field electromagnetic survey,and geochemical analyses of hydrothermal minerals.The results showed that:①At least three tectonic events occurred in the Tongshanling ore field.D_(1) is pre-mineralization,the NWW-SEE compression led to the formation of NNE-trending folds,reverse faults,and NWW-trending extensional faults.D_(2) is syn-mineralization,the NW-SE extension was accompanied by granodiorite emplacement and skarn-type Cu-polymetallic mineralization.D_(3) is post-mineralization,the North-South compression resulted in the sinistral strike-slip of the NNE-trending faults.②A wide-field electromagnetic survey indicated that the physical properties of deep granite intrusions were significantly different from those of the surrounding limestone rocks,and granites had high resistivity,whereas the layered low-resistivity bodies corresponded to limestone strata.The steeply dipping boundaries of the low-resistivity bodies are interpreted as regional faults.The transitional zones between high-and layered low-resistivity bodies are suggested to be potential favorable mineralization areas.③Two stages of calcite veins were recognized in the surface fault zones,and the second-stage calcite is related to the magmatic-hydrothermal activity.On the basis of this study,we delineated two metallogenic prediction areas in the Tongshanling ore field.

关 键 词：构造解析 方解石地球化学 广域电磁法 铜山岭矿田 

分 类 号：P613[天文地球—矿床学]