Trace element abundances in clinopyroxene and whole-rock geochemistry:Implications for source characteristics of Xiangshanzhong mafic-ultramafic intrusion in the Central Asian Orogenic Belt,NW China

摘要：

　　The Xiangshanzhong mafic-ultramafic intrusion is one of the important Ni-Cu sulfide-bearing mafic-ultramafic intrusions in eastern Tianshan located in the southern margin of the Central Asian Orogenic Belt (CAOB),NW China.The complex consists of diorite,gabbro,norite,lherzolite,harzburgite,and olivine websterite.Obviously pyroxene cumulate structure,high Mg,low Cr,Na,and Ti contents,consistent low trace element contents and relatively high crystallization temperature of clinopyroxenes,all imply that the cumulated phase olivine clinopyroxenite sample was the earliest crystal phase in Xiangshanzhong mafic-ultramafic complex.AlⅣ and TiO2 compositions,LREE enrichment,Nb,Ta,Zr and Hf primitive mantle-normalized negative anomalies of this clinopyroxene indicate that the characteristics of parental magma should be tholeiitic magma from the spinel peridotite mantle source.

作者: Dong-Mei Tang Ke-Zhang Qin Qing-Hua Xiao Ben-Xun Su Ming-Jian Cao

作者单位: Key laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029,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: 216-219

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）