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川藏交界金沙江流域广泛发育一套由前寒武系茶马贡群、古生界、三叠系义敦群组成的区域变质岩系,呈近南北向展布,大体与金沙江在该段的走向一致。本文讨论的金沙江变质带西以玉树—羊拉弧形断裂为界,东至欧巴纳—定曲河—中甸断裂,北起四川省白玉县经巴塘县、得荣县、向南经奔子栏、中甸延入云南省境内。东西宽约40公里、南北长达300余公里。呈近南北向“牛角”形(图1)。其所处大地构造位置按中国地质科学院1978年划分意见属滇藏地槽褶皱区“三江”印支褶皱系。这里地质构造复杂、矿产资源丰富亟待进一步研究开发。
At the junction of Sichuan-Tibet area, a series of regional metamorphic rocks, consisting of the Precambrian Tea Masong Group, Paleozoic and Triassic Yoshun Group, are widely developed and distributed nearly in the north and south direction. The same trend of the paragraph. The Jinshajiang metamorphic belt discussed in this paper is bounded by the Yushu-Yangla arc-shaped fault in the west, the Obana-Dingquhe-Zhongdian fault in the east, Baitang County in Sichuan Province in the north, De Rongxian County in the south, Benzilan, Zhongdian extended to Yunnan Province. What 40 km wide, up to 300 km north-south. Was nearly north-south “horns” shape (Figure 1). The tectonic positions of the tectonic units in the area are located in the “Sanjiang” Indosinian fold system of the Yunnan-Tibet Slot Fold Zone according to the 1978 classification by the Chinese Academy of Geological Sciences. Geological structure here is complex, rich in mineral resources for further research and development.