Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.oregeorev.2015.08.015 |
Geochemical challenges of diverse regolith-covered terrains for mineral exploration in China | |
Wang Xueqiu2,3; Zhang Bimin1,3; Lin Xin1,3; Xu Shanfa1,3; Yao Wensheng1,3; Ye Rong2,3 | |
通讯作者 | Wang Xueqiu |
来源期刊 | ORE GEOLOGY REVIEWS |
ISSN | 0169-1368 |
EISSN | 1872-7360 |
出版年 | 2016 |
卷号 | 73页码:417-431 |
英文摘要 | In recent years mineral exploration has concentrated on concealed deposits in regolith-covered terrains. In China, the regolith-covered landscapes mainly include desert windblown sand basins, desert peneplains, semi-arid grassland, loess plateaus, forestry land, alluvial plains and laterite terrains. These diverse regolith-covered areas represent geochemical challenges for mineral exploration in China. This paper provides an overview of recent progress on mechanisms of metal dispersion from the buried ore deposits through the transported cover to the surface and penetrating geochemical methods to detect the anomalies. Case studies show that, in arid and semi-arid desert sand-covered terrains, sampling of fine-fraction (-120 mesh, <0.125 mm) clay-rich horizon soil is cost-effective for regional geochemical surveys for sandstone-type uranium, gold, and base metal deposits. Fine-fraction sampling, selective-leaching and overburden drilling geochemical methods can effectively indicate the 210 gold ore body at Jinwozi goldfield. In alluvium-covered terrains, fine-grained soil sampling (-200 mesh, <0.074 mm) combined with selective leaching geochemistry shows clear ring-shaped anomalies of Cu and Ni over the Zhouan concealed Cu-Ni deposit. In laterite-covered terrains, the anomalies determined by the fine-fraction soils and selective leaching of absorbed metals on coatings of Fe-Mn oxides coincide well with the concealed deposit over the Yueyang ore deposits at the Zijin Au-Cu-Ag field. Nanopartides of hexagonal crystals mainly native copper, gold and alloys of Cu-Fe, Cu-Fe-Mn, Cu-Ti, and Cu-Au were observed in gases, soils and ores using a transmission electron microscope (TEM). The findings imply that nanopartides of gold and copper may migrate through the transported cover to the surface. Uranium is converted to uranyl ions [UO22+] under oxidizing conditions when migrating from ore bodies to the surface. The uranyl ions are absorbed on clay minerals, because clay layers have a net negative charge, which needs to be balanced by interlayer cations. Nanoparticles of Au and Cu and ion complexes of U are more readily absorbed onto fine fractions of soils containing clays, colloids, oxides and organic matters. Thus, fine-grained soils enriched with clays, oxides and colloids are useful media for regional geochemical surveys in regolith-covered terrains and in sedimentary basins. Fine-fraction soil sampling combined with selective leaching geochemistry is effective for finding concealed ore bodies in detailed surveys. Penetrating geochemistry at surface sampling provides cost-effective mineral exploration methods for delineation of regional and local targets in transported cover terrains. (C) 2015 Elsevier B.V. All rights reserved. |
英文关键词 | Regolith Nano-crystal particles Gold Copper Uranium |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000366788100004 |
WOS关键词 | THICK GLACIAL OVERBURDEN ; PORPHYRY-CU DEPOSITS ; NORTH-WESTERN CHINA ; NI SULFIDE DEPOSIT ; JINWOZI GOLD FIELD ; YILGARN CRATON ; ENZYME LEACH ; TRANSPORTED OVERBURDEN ; REGIONAL EXPLORATION ; NORTHWESTERN CHINA |
WOS类目 | Geology ; Mineralogy ; Mining & Mineral Processing |
WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/195264 |
作者单位 | 1.CAGS, Inst Geophys & Geochem Explorat, Langfang 065000, Peoples R China; 2.China Univ Geosci Beijing, Beijing 10083, Peoples R China; 3.Minist Land & Resources, Key Lab Geochem Explorat, Langfang 065000, Peoples R China |
推荐引用方式 GB/T 7714 | Wang Xueqiu,Zhang Bimin,Lin Xin,et al. Geochemical challenges of diverse regolith-covered terrains for mineral exploration in China[J],2016,73:417-431. |
APA | Wang Xueqiu,Zhang Bimin,Lin Xin,Xu Shanfa,Yao Wensheng,&Ye Rong.(2016).Geochemical challenges of diverse regolith-covered terrains for mineral exploration in China.ORE GEOLOGY REVIEWS,73,417-431. |
MLA | Wang Xueqiu,et al."Geochemical challenges of diverse regolith-covered terrains for mineral exploration in China".ORE GEOLOGY REVIEWS 73(2016):417-431. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。