Wide-spaced sampling for delineation of geochemical provinces in desert terrains, northwestern China

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	Wide-spaced sampling for delineation of geochemical provinces in desert terrains, northwestern China
	Wang, XQ (Wang, Xueqiu); Chi, QH (Chi, Qinghua); Liu, HY (Liu, Hongyan); Nie, LS (Nie, Lanshi); Zhang, BM (Zhang, Bimin)
刊名	GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS
	2007
卷号	7 页码:153-161
关键词	desert terrains wide-spaced sampling geochemical provinces fine fraction
ISSN号	1467-7873
英文摘要	Desert terrains are widely distributed in northwestern and northern China, but remain largely unexplored or under-explored. In the past, lag materials (coarse fraction of regolith) have been sampled for regional geochemical surveys. This sampling method was successful in mountainous and hilly regions, but it failed in areas of lower relief, such as slopes, plains, alluvial valleys and basins. Studies conducted since 1999 were aimed at understanding the environment and the nature of geochemical dispersion in order to find a cost-effective, wide-spaced sampling method for delineation of geochemical provinces. The results show that many elements related to mineral deposits are concentrated in the fine fraction (< 120 mesa, 125 tm) in the weakly cemented horizon in the upper part of the vertical profile. Wide-spaced sampling was carried out in an area of c. 150 000 km 2 at a density of one sample per 100 km(2). Samples were collected from the weakly cemented sandy clay-rich horizon at a depth of 15-30 cm and sieved to < 120 mesh in the field. The sieved samples were ground to 200 mesh (75 tm). Thirty-four elements were determined by ICP-MS, GF-AAS and AFS. A geochemical atlas and interpreted geochemical maps were generated using a GIS. Geochemical provinces of Au, Cu and U have been recognized. Five Au provinces, with threshold values of more than 2.0 ppb An, have been delineated. Three of these are consistent with known large Au deposits, and preliminary follow-up surveys indicate that the other two are prospective for undiscovered Au deposits. Seven u provinces have been delineated, of which three are endowed with hydrothermal Cu deposits, porphyry Cu deposits and Cu-Ni deposits, respectively. Two provinces of U associated with Mo were delineated in the basin. One of them contains a large sandstone-hosted U deposit and in the other, a large new U deposit was discovered by follow-up drilling.
学科主题	地球化学勘查
WOS关键词	METALLOGENIC PROVINCES ; RECONNAISSANCE ; PATTERNS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	GEOLOGICAL SOC PUBL HOUSE
WOS记录号	WOS:000246212300006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38577]
专题	中国地质调查局
作者单位	Inst Geophys & Geochem Explorat, Langfang, Hebei, Peoples R China CAGS, Appl Geochem Lab, Langfang, Hebei, Peoples R China Jilin Univ, Changchun, Jilin, Peoples R China
推荐引用方式 GB/T 7714	Wang, XQ ,Chi, QH ,Liu, HY ,et al. Wide-spaced sampling for delineation of geochemical provinces in desert terrains, northwestern China[J]. GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS,2007,7:153-161.
APA	Wang, XQ ,Chi, QH ,Liu, HY ,Nie, LS ,&Zhang, BM .(2007).Wide-spaced sampling for delineation of geochemical provinces in desert terrains, northwestern China.GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS,7,153-161.
MLA	Wang, XQ ,et al."Wide-spaced sampling for delineation of geochemical provinces in desert terrains, northwestern China".GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS 7(2007):153-161.