New Understanding for Sanchahe Nephrite Deposit in East Kunlun
详细信息
- 责任者：Yang Tianxiang (Gemmological Institute ; China University of Geosciences ; Wuhan 430074 ; China) ; Yang Mingxing
- 刊名：Journal of Guilin University of Technology
- 出版年：2013
- 卷期：33(2)
- 关键词：软玉 ; nephrite ; 矿床成因 ; mineral deposit genesis ; 昆仑山 ; Kunlun Mountains
- 页码：p.239-245
- 图表：illus., 1 table, 15 refs.
- 分类号：1002
- issnNo：ISSN1674-9057
- isbnNo：CN45-1375/N
摘要
Based on the analysis of the field geological phenomenon from Sanchahe Nephrite deposit,the sample test data of LA-ICP-MS and lithofacies character,this article advances a new understanding of the deposit forming model from the aspect of ore-forming source.From the field geological phenomenon,whether the mafic dikes intruded into the marble strata,or the silicic fluid intruded into the marble strata,the nephrite could not be fromed.But when the mafic dikes intruded into the marble strata,the later silicic fluid also intruded into the marble strata,the nephrite can be formed.The sample lithofacies character shows that the Mg in region marble is insufficient.The trace element characteristics show that the content of large ion lithophile elements(LILE) K,U,Th,Rb,Ba,Sr is relatively higher than that of high field strength elements(HFSE) Ti,Ta,Nb,Zr,Hf,Y,suggesting the process of nephrite formation has fluid activity.Therefore,the formation of nephrite relates to marble,mafic rock dyke and the later silicic fluid.The later silicic fluid provides SiO2,the mafic rock dyke provides Mg and the marble provides Ca,Mg and ore-forming places.
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