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本文所述滇西北系指云南维西县和德钦县一带,在金沙江与澜沧江之间,北起德钦,南迄剑川、洱源,长200余公里的范围内。这里的三叠系中统和下统基本缺失。上统则分布极为广泛(图1),且有矿点多处。本文主要对地层及其时代,火成岩性质,进而对大地构造性质和含矿层位,作一些探讨。此地交通不便,人烟稀少。地质工作程度低,对地层和火成岩的划分与研究都比较笼统,认识也不一致。这里北距藏东上三叠统下部甲丕拉组(表
The northwestern Yunnan refers to the areas of Weixi County and Deqin County, Yunnan Province, between the Jinsha River and the Lancang River in the north, Deqin in the north, Jianchuan and Ergyuan in the south, and over 200 kilometers in length. The Triassic Central and Subordinate here are basically missing. The system is extremely broad distribution (Figure 1), and a number of mine points. In this paper, some discussions are made on the strata and its age, the igneous nature, and then on the tectonics and ore-bearing beds. Here traffic inconvenience, sparsely populated. Geological work is low, the stratigraphic and igneous rock division and research are more general, understanding is inconsistent. Here north of Tibet Triassic Upper Triassic group (Table