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云南西部中缅边界的怒江一带被认为是青藏高原向东南逃逸的通道,但位于通道之中、红河-哀牢山走滑剪切带与高黎贡山剪切带之间的贡山地块应属于哪一个大地构造单元的组分,目前尚不清楚.通过对云南福贡县马吉一带古当河片麻状花岗岩锆石SHRIMP年龄测定,确定该花岗岩的岩浆结晶年龄为(487±11)Ma,并发现锆石具有773～794Ma的残核,该年龄可以与印度板块内部及喜马拉雅造山带中发育大量同时代的花岗质岩石相对比,表明与印度大陆有非常密切的亲缘关系,该研究对揭示滇西地区怒江流域的构造属性有重要意义.
The Nujiang area along the Sino-Burmese border in western Yunnan is considered to be the southeaster-escaped channel of the Qinghai-Tibet Plateau. However, the Gongshan block between the Honghe-Ailao-strike-slip shear zone and the Gaoligongshan shear zone should belong to The composition of which tectonic unit is not yet clear.Based on the SHRIMP dating of the Gudanghe gneissic granite in the Maggi area, Fugong County, Yunnan Province, the magmatic age of the granite is determined to be (487 ± 11) Ma And found that the zircons have a residual nucleus of 773 to 794 Ma that is comparable to the development of a large number of contemporaneous granitic rocks within the Indian Plate and the Himalayan orogen and indicates a very close genetic relationship with the Indian continent. It is of great significance to reveal the tectonic attribute of the Nujiang River basin in western Yunnan.