满洲里—额尔古纳地区岩浆作用及其大地构造意义

对满洲里－额尔古纳地区不同时代岩浆岩的地质，地球化学特征进行了初步研究，研究表明晚元古代花岗岩具S型花岗岩或地壳改造型花岗岩特征，形成于同碰撞造山环境，加里东早期花岗岩具I型，科迪勒拉I型或ACG特征,代表活动大陆边缘构造属性，加里东晚期花岗岩具S型或地壳改造型特征，代表陆－陆碰撞造山环境，加里东期花岗岩记录了多宝山－牙克石－伊尔施陆间洋壳消减和闭合的过程，海西晚期花岗岩属富碱低钙钙碱性岩石，具S型花岗岩或CPG，KCG花岗岩特征，形成于碰撞后构造环境，中生代早期岩 岩形成于蒙古－－鄂霍茨克残余洋“剪刀式”闭合所造成的张性似裂谷环境，中生代晚期岩浆岩形成于挤压环境。

MAGMATISM AND ITS TECTONIC SIGNIFICANCE IN THE MANZHOULI-E'ERGONA REGION

Based on the geological and geochemical studies of magmatite in the different period from the Manzhouli-E'erguna region, it is suggested that the Later Proterozoic granitoids, which is characterized by S-type granitoids or crust-reconstructed granite type in south of China,were associated with a collision geodynamic environment. The Early Caledonian granitoids, showing characteristics of I-type granitoids, Cordilleran I-type granitoids or low-K, high-Ca amphibole-bearing calc-alkaline granitoids (ACG),were associated with an active continental margin and reflected the subduction of oceanic crust during the Caledonian period. The Later Caledonian granitoids, which is characterized by S-type granitoids or crust-reconstructed granite type in south of China,were associated with a collision between two continents. The magmatism of the Caledonian recorded the history of subduction of Duobaosan-Yakeshi-Yiershi intercontinental ocean. The Later Hercynian granitoids, which are similar to S-type, cordierite bearing-peraluminous granitoids (CPG) or K-rich calc-alkaline granitods (KCG), revealed a post-collision geodynamic environment. The Early Mesozoic magmatite developed on the tensional background caused by closing of Mongolia-Ehucike Residual Ocean in scissors form. The Later Mesozoic magmatite formed in compression background.