摘要
对西昆仑克里阳钾镁煌斑岩的岩石学特征及源区性质进行了详细研究 ,并同国内外钾镁煌斑岩及其他超钾质岩石作了对比。该钾镁煌斑岩富 Al2 O3、贫 Ti O2 ,不相容元素相对亏损 ,为不含金刚石类型。其源区富集程度不高 ,交代作用较弱 ,且起源深度较浅 ( >1 1 5km)。高的 C、Sr、Pb同位素组成表明该钾镁煌斑岩可能受到了壳源物质的混染。这些特征暗示西昆仑地区有其他含金刚石源岩的存在。
Detailed studies on petrology features and source properties of Keliyang lamproite and comparison with worldwide lamproites and other potassic rock suites indicate that it is barren in diamond,and rich in Al 2O 3,depleted in TiO 2 and imcompatible element,with relatively low degree enrichment source,weak metasomatism and relatively shallow original depth(>115 km) Fairly high C,Sr,Pb isotope compositions prove that the lamproite might have been contaminated by crustal material These characteristics imply that there are probably other diamond host rocks in West Kunlun area
出处
《现代地质》
CAS
CSCD
北大核心
2000年第4期385-391,共7页
Geoscience
基金
"九五"国家科技攻关三○五项目!(编号 :96 -915 -0 6 -0 6 )
国家自然科学基金项目!(编号 :499730 13)
