Extremely low PGE concentrations of the Permian continental flood basalts in the Tarim Basin,northwest China:Implication for the evolution of the Tarim Large Igneous Province

摘要：

　　Permian continental flood basalts (CFB) in the Tarim Large Igneous Province (TLIP) possess extremely low PGE concentrations (ΣPGE = 0.051–0.723 ppb).They exhibit a marked increase in Cu/Pd ratios (>105) albeit with a narrow range of lower Pd/Ir ratios (<50),indicating that their parent magmas were significantly depleted in chalcophile elements.The Tarim CFB magmas are estimated to have formed by <5% partial melting of the mantle source.The calculated SCSS indicate that they were probably S-saturated during very low-degree partial melting,leaving a substantial volume of residual sulfide in the source region.The degree of partial melting should play an important role on the PGE geochemistry and potential PGE–(Ni–Cu) ore deposits in the TLIP.

作者: Yin-Qi Li Zi-Long Li Han-Lin Chen Shu-Feng Yang Xing Yu Ya-Li Sun

作者单位: Department of Earth Sciences,Zhejiang University,Hangzhou 310027,China Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China

会议类型: 国际会议

会议名称: 第十二届镍矿床国际会议

会议地点: 贵阳

会议语种:英文

页码: 265-268

在线出版日期: 2012-06-16（万方平台首次上网日期，不代表论文的发表时间）