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怒江、澜沧江、金沙江(以下简称三江)在西藏东部昌都地区急转南下,这些河流切割很深,沿岸地形十分陡峻,形成著名的三江峡谷。这里的地质构造十分复杂,构造线由北西西走向转入近南北向,构成了我国西南巨大的弧形构造域。三江峡谷,实际上也是一系列弧形深断裂发育的部位,这些深断裂发展时期较长,并具多旋迴活动的特点,直接控制了本区多旋迴的构造变动、多旋迴的变质作用、多旋迴的岩浆活动及多旋迴成矿。
The Nu River, the Lancang River and the Jinsha River (hereinafter referred to as the Sanjiang River) plunged southward in the Changdu area of eastern Tibet. The rivers cut deep and the coastal terrain is steep, forming the famous Sanjiang Gorge. The geological structure here is very complicated. The tectonic line turns from North West to South near North and South, forming a huge arc tectonic domain in southwest China. The Sanjiang Gorge, in fact, is also the site of a series of arc-shaped deep faults. These deep faults have a long period of development and are characterized by multi-cycle activities, which directly control the structural changes of multi-cycles in the area and the multi-cycle metamorphism Role, multi-cycle magmatic activity and multi-cycle mineralization.