摘要
胶东三山岛北部海域金矿是近年来新发现的超大型金矿,对其开展深部资源潜力评价和找矿预测具有重要意义。本文基于成因矿物学与找矿矿物学理论,在胶东三山岛北部海域金矿第30号勘探线ZK3007钻孔岩芯二次系统编录的基础上,对主要载金矿物黄铁矿进行了矿物学研究,同时结合岩石地球化学特征,对该矿床深部进行了预测。结果表明,在-1 200^-1 600 m标高范围的黄铁矿晶形主要为立方体与五角十二面聚形、自形立方体单形、半自形立方体单形和它形-半自形立方体单形;黄铁矿晶胞的a0轴一般为5.417 0~5.444 2 nm,普遍大于理论值(5.417 nm),且与Au含量呈正相关关系,可能是As类质同象替代S;黄铁矿的热电导皆为P型,热电系数为78~328μV/℃,集中于238~308μV/℃。此外,在-1 200^-1 600 m标高范围内,绢英岩、黄铁绢英岩内富含As、Ag、Sb等低温元素。上述结果说明,在-1 200~1 600m标高范围内的矿体仍为矿体头部,深部具有非常好的找矿前景。
The Sanshandao North Offshore gold deposit is a newly discovered super-large gold deposit in the northern offshore of the Sanshandao area. To undertake the resource potential evaluation and prospecting prediction in depth of the deposit has great significance. Based on the theories of genetic mineralogy and prospecting mineralogy, and the twice systematic logging of cores from the ZK3007 borehole of the No. 30 exploration line in the Sanshandao North Offshore gold deposit in Shandong Province, characteristics of the pyrite, as a main gold-bearing mineral of the deposit, have been studied by using the mineralogical research methods in this paper. Combined with petro-geochemistry of rocks and ores, characteristics of the pyrites have been then applied to predict the exploration potential in the deep part of the deposit. The results show that there are four types of pyrite crystals, such as the combination of cube and pentagonal dodecahedron, monomorph of euhedral cube, monomorph of semi-euhedral cube, and monomorph of anhedral to semi-euhedral cube, in samples collected from cores at elevations ranging from-1 200 meters to-1 600 meters. The cell parameters of pyrites, ranging from 5.417 0 to 5.444 2 nm, are generally bigger than the theoretical value of 5.417 nm, and are positively correlated with their Au contents. It is inferred that the homogenous substitution of S by As in lattice of pyrite might lead to this result. The thermoelectricity conductivity types of pyrites all belong to the P type, with the thermoelectric coefficient values ranging from 78 to 328 μV/℃, mainly from 238 to 308 μV/℃. Meanwhile, some low-temperature elements such as As, Ag, and Sb, are enriched in the sericite-quartz altered rock and pyrite-sericite-quartz altered rocks in cores at elevations ranging from-1 200 to-1 600 m. The above results clearly indicate that there is a good exploration potential in the depth of the deposit as the known ore body within elevations ranging from-1 200 to-1 600 m could be just the front part of the whole mineralized body.
作者
高建伟
申俊峰
李国武
王来明
孙宁岳
刘汉栋
迟雷
张华锋
杜柏松
GAO Jian-wei;SHEN Jun-feng;LI Guo-wu;WANG Lai-ming;SUN Ning-yue;LIU Han-dong;CHI Lei;ZHANG Hua-feng;DU Bai-song(Cores and Samples Center of Natural Resource,China Geological Survey,Yanjiao Hebei 065201,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Laboratory of Crystal Structure,China University of Geosciences(Beijing),Beijing 100083,China;Shandong Institute of Geological Survey,Jinan 250013,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2020年第6期1205-1214,共10页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
中国地质调查局地质调查项目(DD20190411)
山东省地质勘查项目(鲁勘字(2018)19号)。
关键词
黄铁矿
晶型
晶胞参数
热电性
金矿
胶东
pyrite
crystal type
cell parameters
thermoelectricity
gold deposit
the Eastern Shandong
