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- Title
金矿立体地球化学探测模型与深部钻探验证.
- Authors
王学求; 张必敏; 于学峰; 杨德平; 夏 勇; 谭亲平; 刘耀文; 张苏坤; 田 密; 刘汉粮; 李瑞红; 韩志轩; 熊玉新; 吴 慧; 张宝云
- Abstract
The research on geochemical exploration for deep-seated ore deposits in covered terrains is centralized on understanding of long-distance vertical migration of mineralization and associated elements and 3D geochemical patterns. This paper provides an insight into 3D metal dispersion patterns of the buried gold ore deposits by sampling drill core rocks and surface soils. The 3D geometric pattern of the alteration type gold deposit in Jiaodong shows that the highest values of Au, S and Hg are in good correlation with the gold orebody, suggesting that the fluids migrated during the process of gold minerlization formation along the hosting fault channels, whereas Au and Hg exhibit vertical anomalies from the deep-seated orebody to the surface, implying that the elements with vertical dispersion of fluids were permeable upwards through the microfractures or rock pores, as supported by finding nanometer-sized particles of gold in wall rock microfractures. The 3D geometric pattern of the Carlin-type gold deposits in Guizhou shows that high values of Au, As, Sb, Hg, Tl and S are enriched in unconformity, which controls the distribution of deep-seated layer-bedded gold orebody, whereas anomalies of Sb, Hg and Au occur at the surface, implying vertical migration through the microfractures of the wall rocks. The geochemical patterns provide predicting methodology for the deep-seated orebody. A deep-seated orebody was discovered in the depths of 2428~3234 m by followup drilling exploration in the soil covered locations of gold anomalies delineated by fine-fraction soil sampling at Wujiazhuang of Jiaodong. An orebody of Au-Ag-Pb-Zn at a depth of 1312 m was discovered by drilling exploration based on fault gouge sampling at Shanggong, Henan. A reserve of 203 tones of gold in the depths of 300~1500 m was discovered according to the targets delineated by geochemical sampling of fine-fraction soils at Shuiyindong of Guizhou Province.
- Publication
Acta Geoscientica Sinica, 2020, Vol 41, Issue 6, p869
- ISSN
1006-3021
- Publication type
Article
- DOI
10.3975/cagsb.2020.102901