沿太平洋边部有一系列岛弧和围绕大陆边部有一圈“白环”——花岗岩(图1);这些花岗岩的时代,很少是古生代的,新生代中期以后的也不多,最大量的是中生代的;伴随这些花岗岩有大量的锡、钨、铜和斑岩铜矿。这就是这个地球上强烈构造变动地带之所以成为世界花岗岩研究者注目的原因。 Along the Pacific Ocean there are a series of island arcs and a “white ring” of granite around the margins of the continental margin (Figure 1); these granites were seldom Paleozoic and not many since the mid-Cenozoic, with the largest Is Mesozoic; accompanied by a large number of these tin, tungsten, copper and porphyry copper deposits. This is why this strongly tectonic zone on Earth has become the focus of world granite researchers.