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中文摘要：
对扬子地块西缘康滇裂谷北段的瓦斯沟花岗质杂岩进行了系统的岩石学、元素-Nd同位素地球化学研究，结果表明该岩体为工型花岗岩，是由前存年轻（中元古代末—新元古代初）岛弧地壳物质部分熔融形成的。早期的花岗岩形成于扬子地块西缘由会聚挤压向陆内伸展的转折环境，晚期的花岗闪长岩形成于板内环境，很可能与新元古代地幔柱事件有关。它们显示的“岛弧地球化学特征”是继承了源岩地球化学特征的结果，不代表其形成时的构造环境。
英文摘要：
Petrological, geochemical and Nd isotopic data are reported for the Neoproterozoic Wasigou complex in the Kangdian rift on the western margin of the Yangtze block. This complex is an I-type granite, and its geochemical and Nd isotopic characteristics suggest that it was generated by partial melting of the pre-existing Late Mesoproterozoic-Early Neoproterozoic island are crust. The early granite was produced by the tectonic transition from compression to intraplate extension on the western margin of the Yangtze block, whereas the late granodiorite was formed in an intraplate setting and might be related to the Neoproterozoic plume event. Their arc-like geochemical features such as Nb-Ta depletion must have been inherited from the protoliths rather than from their tectonic setting during the formation of the complex.
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