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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。
The petrological characteristics and provenance characteristics of the Cretaceous lamprophyte in western Kunlun have been studied in detail and compared with the porphyry and other supra-potash rocks at home and abroad. The magnesia lamprophyte is rich in Al 2 O 3 and lean Ti O 2, and relatively incompatible elements are depleted in the absence of diamond type. The source area is not rich, accountability is weak, and the shallow depth of origin (> 115km). The high C, Sr and Pb isotopic compositions suggest that this pegmatite may have been contaminated with shell-derived materials. These features suggest that there are other diamond-bearing source rocks in the West Kunlun area.