Arid
DOI10.1144/1467-7873/07-131
Vertical variations and dispersion of elements in arid desert regolith: a case study from the Jinwozi gold deposit, northwestern China
Wang, Xueqiu; Wen, Xueqin; Rong, Ye; Liu, Zhanyuan; Sun, Binbin; Zhao, Shanding; Shi, Shujuan; Wei, Hualing
通讯作者Wang, Xueqiu
会议名称22nd International Geochemical Exploration Symposium
会议日期SEP, 2005
会议地点Perth, AUSTRALIA
英文摘要

Desert terrains in northern China are covered by widespread regolith sediments which mask geochemical signals from ore bodies and are major obstacles to mineral exploration. There is a critical need to study the vertical distribution of elements in the regolith, and to determine potential mechanisms for transferring elements from the ore body upwards through regolith cover to the surface, and to establish appropriate sampling media and analytical methods. The Jinwozi gold deposit, which is covered by four to several tens of metres of regolith sediment, was selected for this study. Samples were taken from different regolith horizons in two vertical profiles over the deposit. Gold and associated elements showed crescent-shaped distribution patterns in the vertical profile, i.e. elements tend to be enriched in lower and upper parts of the profile over the ore body. Enrichment of elements in weathered rocks is derived from the ore body, whereas enrichment at or near surface is due to adsorption by clays or oxide coatings. For gold, the greatest contrast between anomalous and background concentration is in the fine fraction of soils, and the An anomalies are located directly over the ore body. Gold appears to migrate vertically to the surface to be trapped in clays and oxide coatings to produce superimposed anomalies in the regolith near or at the surface. Fine fraction samples (-120 mesh; 125 tm) from clay-rich horizons or selective leaching of elements adsorbed on clays or oxide coatings are effective for locating buried deposits.


英文关键词geochemical variations migration mechanism desert regolith partial leach Jinwozi gold deposit
来源出版物GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS
ISSN1467-7873
EISSN2041-4943
出版年2007
卷号7
页码163-171
出版者GEOLOGICAL SOC PUBL HOUSE
类型Article;Proceedings Paper
语种英语
国家Peoples R China
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000246212300007
WOS关键词MOBILE FORMS ; OVERBURDEN ; METALS
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/296513
作者单位(1)Inst Geophys & Geochem Explorat, Langfang 065000, Hebei, Peoples R China;(2)CAGS, Key Lab Appl Geochem, Langfang 065000, Hebei, Peoples R China;(3)Changan Univ, Xian 710054, Shaanxi, Peoples R China;(4)China Univ Geosci, Beijing, Peoples R China
推荐引用方式
GB/T 7714
Wang, Xueqiu,Wen, Xueqin,Rong, Ye,et al. Vertical variations and dispersion of elements in arid desert regolith: a case study from the Jinwozi gold deposit, northwestern China[C]:GEOLOGICAL SOC PUBL HOUSE,2007:163-171.
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