Arid
DOI10.1144/1467-7873/07-124
Wide-spaced sampling for delineation of geochemical provinces in desert terrains, northwestern China
Wang, Xueqiu; Chi, Qinghua; Liu, Hongyan; Nie, Lanshi; Zhang, Bimin
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 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.


英文关键词desert terrains wide-spaced sampling geochemical provinces fine fraction
来源出版物GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS
ISSN1467-7873
出版年2007
卷号7
页码153-161
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CPCI-S ; SCI-E
WOS记录号WOS:000246212300006
WOS关键词METALLOGENIC PROVINCES ; RECONNAISSANCE ; PATTERNS
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/2XILL650/296512
作者单位(1)Inst Geophys & Geochem Explorat, Langfang, Hebei, Peoples R China;(2)CAGS, Appl Geochem Lab, Langfang, Hebei, Peoples R China;(3)Jilin Univ, Changchun, Jilin, Peoples R China
推荐引用方式
GB/T 7714
Wang, Xueqiu,Chi, Qinghua,Liu, Hongyan,et al. Wide-spaced sampling for delineation of geochemical provinces in desert terrains, northwestern China[C]:GEOLOGICAL SOC PUBL HOUSE,2007:153-161.
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