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省内岩浆岩可分为三个岩带,即祁连岩带(北带)、昆仑岩带(中带)、唐古拉—巴颜喀拉岩带(南带)。它们分别以布哈河—扎麻山和东、西大滩—玛沁断裂带为界,呈北西西向或东西向展布,且形成时代自北而南逐渐变新。北带以元古代和早古生代的中酸性侵入体和早古生代的中基性喷出岩为主;中带以晚古生代中酸性侵入岩为主;南带主要分布中生代的中酸性侵入岩类(图1)。岩浆岩的地球化学特点在一定程度上反映了省内地壳发展的进程。
The magmatic rocks in the province can be divided into three rock zones: the Qilian rock belt (the northern belt), the Kunlun rock belt (the middle belt) and the Tanggula-Bayan Kala rock belt (the southern belt). They are distributed along the Buha River-Zhama Mountain, the East and the Xidatan-Maqin fault zones, respectively, spreading northwest or east-west, and the times of formation gradually change from north to south. The northern zone is dominated by Mesoproterozoic and Early Paleozoic intermediate-acid intrusions and Early Paleozoic mid-basic discharge rocks; the middle belts are dominated by Late Paleozoic intermediate-acid intrusive rocks; and the southern belt is mainly distributed in Mesozoic intrusive rocks figure 1). The geochemical characteristics of magmatic rocks to a certain extent, reflect the process of the development of the crust in the province.