Abundances and significance of platinum group elements in carbonatites from China

	Abundances and significance of platinum group elements in carbonatites from China
	Cheng Xu; Liang Qi; Zhilong Huang; Yanjing Chen; Xuehui Yu; Linjun Wang; Endong Li
	2008
发表期刊	Lithos
卷号	105 期号:3-4 页码:201-207
摘要	The concentrations of the platinum group elements (PGEs: Ir, Ru, Rh, Pt, Pd) were determined in 29 extrusive and intrusive carbonatites from 7 locations in China. The samples were analyzed using an improved Carius tube with high temperature and high pressure. All samples are characterized by low total PGE contents (0.07–2.5 ppb), and only trace magmatic sulfides are observed in thin sections. The carbonatites may reach sulfur saturation because they are known to be derived by small degrees of partial melting (< 1%). The PGEs may be compatible in sulfides with very high sulfide–carbonatite melt partition coefficients. Segregation of an immiscible sulfide melt can result in the loss of PGEs in the carbonatites. Compared with the intrusive and silicate-poor extrusive carbonatites, the silicate-rich extrusive carbonatite contains relatively abundant clinopyroxene and titanomagnetite and higher IPGE (Ir and Ru) contents. This implies that IPGEs may be compatible in these mineral phases. The low IPGE abundances and fractionated patterns in the intrusive and silicate-poor extrusive carbonatites reflect that they may have experienced significant fractionation of sulfides and IPGE-rich mafic silicates and oxides before final emplacement. The high PGE compositions in the silicate-rich extrusive carbonatite may represent mantle materials entrained by the rising carbonatite magma.
关键词	Extrusive Carbonatites Intrusive Carbonatites Pge Abundances Mantle Materials
学科领域	矿床地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6793
专题	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Cheng Xu,Liang Qi,Zhilong Huang,et al. Abundances and significance of platinum group elements in carbonatites from China[J]. Lithos,2008,105(3-4):201-207.
APA	Cheng Xu.,Liang Qi.,Zhilong Huang.,Yanjing Chen.,Xuehui Yu.,...&Endong Li.(2008).Abundances and significance of platinum group elements in carbonatites from China.Lithos,105(3-4),201-207.
MLA	Cheng Xu,et al."Abundances and significance of platinum group elements in carbonatites from China".Lithos 105.3-4(2008):201-207.

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