Platinum Group Elements Geochemistry of Jinbaoshan Pt-Pd Deposit in Yunnan Province and Its Exploration Implications
详细信息
- 责任者：Wang Shengwei (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Sun Xiaoming
- 刊名：Mineral Deposits
- 出版年：2012
- 卷期：31(6)
- 关键词：铂矿 ; platinum ores ; 钯矿 ; palladium ores ; 铂族元素 ; platinum group elements ; 云南 ; Yunnan Province
- 页码：p.1259-1276
- 图表：4 illus., 5 tables, 43 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
///Jinbaoshan which contains large amounts of chromites and has high Cr content is the largest independent Pt-Pd deposit which consists mainly of olivine and clinopyroxenite. Samples from Jinbaoshan rock body have similar Cu/Pd and Cu/Pt ratios. The data show that the parent magma of the ores had low S saturation,whereas the parent magma of the ultrabasic wall rocks was probably formed on the geochemical interface of S saturation related to Emeishan mantle plume. The low S saturation of Emeishan mantle plume in the early stage and high partition coefficient of PGE in the sulfide/silicate phases seem to be the essential factors responsible for high PGE and low Ni-Cu content of the Jinbaoshan deposit.Jinbaoshan is one of the rarely found rock bodies which have lower Cu/Pd and Cu/Pt ratios than the value of primitive mantle in China,implying that the magma of Jinbaoshan has experienced a procedure of PGE enrichment.The basic-ultrabasic intrusive body located close to the eruption center of Emeishan basalt seems to be one of the best hopeful areas in search for PGE deposits.