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引用本文:刘华南,刘家军,李小伟,刘冲昊,代鸿章,陶银龙,王建锋,杜映东,范云飞. 内蒙古新地沟金矿床黄铁矿热电性特征及深部找矿意义[J]. 中国地质, 2018, 45(4): 819-838.
LIU Huanan,LIU Jiajun,LI Xiaowei,LIU Chonghao,DAI Hongzhang,TAO Yinlong,WANG Jianfeng,DU Yingdong,FAN Yunfei. Thermoelectric characteristics of pyrite from the Xindigou gold deposit in Inner Mongolia and its significance on deep prospecting[J]. Geology in China, 2018, 45(4): 819-838(in Chinese with English abstract).
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内蒙古新地沟金矿床黄铁矿热电性特征及深部找矿意义
刘华南1,2, 刘家军1,2, 李小伟1,2, 刘冲昊1,2, 代鸿章1,2, 陶银龙1,2, 王建锋3, 杜映东3, 范云飞3
1.中国地质大学(北京)地质过程与矿产资源国家重点实验室, 北京 100083;2.中国地质大学(北京)地球科学与资源学院, 北京 100083;3.内蒙古自治区矿产实验研究所, 内蒙古 呼和浩特 010031
摘要:
内蒙古新地沟金矿是中型绿岩型金矿床,但已属于严重资源危机的矿山,急待寻找接替资源,因此对新地沟金矿床进行深部远景预测具有十分重要的意义。本文根据找矿矿物学和成因矿物学理论,利用显微镜、电子探针及热电仪系统分析新地沟金矿床不同标高和矿段中黄铁矿的热电型标型特征,研究结果表明:新地沟金矿床中黄铁矿的晶型以立方体、五角十二面体及聚形为主;热电系数变化主要集中在-331.10~340.20 μV·℃-1范围内,导电型多以N型为主,约占总含量的80%;成矿温度主要集中于250~340℃,属于中温矿床。黄铁矿热电性参数XNP变化范围较大,估算矿体剥蚀率为67.96%~74.31%。通过对黄铁矿导型的空间分布规律和矿体剥蚀分析表明:油篓沟矿段位于矿体中底部,向深部可能有小规模延伸,小西沟矿段钻孔ZK106在深部有较大规模的延伸,其矿化前景最好;小西沟矿段钻孔ZK102深部矿化前景次之;大汗青矿段钻孔ZK2802其深部矿化前景较差。综合分析认为,该矿床深部具有较好的找矿潜力。
关键词:  新地沟  金矿床  黄铁矿  热电性  内蒙古
DOI:10.12029/gc20180412
分类号:P678.51
基金项目:中国地质调查局新兴产业资源战略调查评价专项工程项目(1212011220673)资助。
Thermoelectric characteristics of pyrite from the Xindigou gold deposit in Inner Mongolia and its significance on deep prospecting
LIU Huanan1,2, LIU Jiajun1,2, LI Xiaowei1,2, LIU Chonghao1,2, DAI Hongzhang1,2, TAO Yinlong1,2, WANG Jianfeng3, DU Yingdong3, FAN Yunfei3
1.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences(Beijing), Beijing 100083, China;2.School of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China;3.Inner Mongolia Minerals Experiment Research Institute, Hohhot 010031, Inner Mongolia, China
Abstract:
The Xindigou gold deposit in Inner Mongolia is a medium-sized greenstone type gold deposit but belongs to crisis mine which needs replaceable resources, and hence it is of great significance to evaluate the deep resources. Based on the prospecting and genetic mineralogy theory, the authors analyzed the thermoelectric characteristics of pyrites at different elevations and orebodies using the microscope, electron probe and thermoelectric instrument. Some conclusions have been reached:The pyrite crystals are mainly characterized by cubic, pentadododecahedral and poly-type in the Xindigou deposit, the thermoelectric properties of pyrites, ranging from -331.10 to 340.20 μV·℃-1, are mainly of the N type, which accounts for about 80%. The ore-forming temperature of the deposit ranges from 250 to 340℃, indicating that the deposit is a medium temperature gold deposit. The thermoelectric parameters of pyrite vary greatly; the degree of denudation varies from 67.96% to 74.31%. According to the spatial distribution of the thermoelectric parameters of the pyrite and the denudation of the orebody, Youlougou orebody may be located at the bottom, and may have a small-scale extension toward the depth. Drill hole ZK106 of Xiaoxigou or body has a better exploration prospect with largescale extension, and drill hole of ZK102 of Xiaoxigou orebody has more potential than ZK2802 of Dahanqing orebody in terms of exploration prospect in the depth. Furthermore, comprehensive results suggest that the deep deposit has good prospecting potential.
Key words:  Xindigou  gold ore deposit  pyrite  thermoelectricity  Inner Mongolia