论文部分内容阅读
浙江显生宙花岗岩包括加里东期、印支期和燕山期。用钻石U－Pb年龄确定了加里东、印支期花岗岩的存在，并讨论了各期花岗岩的主元素、稀土元素、微量元素和钛、锶、铅同位素组成的特征，以及它们的岩石成因。加里东和印支期花岗岩是元古宙基底岩石部分熔融的产物，燕山期花岗岩类是壳幔混合花岗岩。加里东和印支期两次构造运动较弱。大面积出露的燕山期花岗岩和火山岩意味着中生代发生了地壳增生。
The Phanerozoic granites in Zhejiang Province include Caledonian, Indosinian and Yanshanian. The existence of the Caledonian and Indosinian granites was confirmed by diamond U-Pb ages. The characteristics of major elements, rare earth elements, trace elements, titanium, strontium and lead isotopic composition of granites and their petrogenesis were discussed. The Caledonian and Indosinian granites are a result of partial melting of the Proterozoic basement rocks, and the Yanshanian granitoids are crust-mantle mixed granites. Two tectonic movements were weak in Caledonian and Indo-China. The widespread Yanshanian granite and volcanic rocks mean that Mesozoic crustal thickening occurred.