Dispersion and Migration of Gold Under Landscape Evolution in Gobi Desert
详细信息
- 责任者：Zhang Bimin (Institute of Geophysical and Geochemical Exploration ; Chinese Academy of Geological Sciences ; Langfang 065000 ; China) ; Wang Xueqiu
- 刊名：Geoscience
- 出版年：2011
- 卷期：25(3)
- 关键词：金矿 ; gold ores ; 地球化学异常 ; geochemical anomaly ; 新疆 ; Xinjiang
- 页码：p.575-580
- 图表：5 illus., 1 table, 10 refs.
- 分类号：1500
- issnNo：ISSN1000-8527
- isbnNo：CN11-2035/P
摘要
Some Gobi desert terrains in Northwest China are peneplains formed by a long period of erosion. Dispersion pattern of elements is changed under this kind of landscape evolution. Jinwozi gold deposit was selected for study of element dispersion and migration in the process of pediplanation by using overburden drilling sampling.The results show that 1) gold tends to concentrate in the top and bottom of the vertical profile over the ore body; 2) gold is enriched in the fine-grained fractions of soils with clay-rich horizons at surface or near surface and the largest gold anomalies occur in fine grained samples (-100 mesh) over the ore body; and 3) gold distribution in different size fractions of soils at the bottom of the weathering regolith display no obvious difference but tend to be anomalously enriched in bedrock troughs. This indicates that gold was concentrated in the lowest places by erosion and lateral transportation during the process of pediplanation.
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