新疆富蕴地区前寒武纪地层的物质组成及其构造变形特征

新疆西北部阿尔泰地区发育一套片岩、片麻岩,从境内铁列克以东的塔乌乃萨孜一带向东南延伸到蒙古阿尔泰山南坡,统称冲乎尔—青河构造建造带。该带以特殊的构造位置和复杂的变形变质特征,成为研究阿尔泰造山带发展、演化的重要热点之一。通过对新疆西北部阿尔泰地区变质岩(前寒武纪地层)的物质组成、变形变质方面的资料收集和分析研究,区域地层对比等,按构造—岩石(地层)单位进行了划分。认为该套地层经受过中深层次的区域动力热流变质作用,变质达角闪岩相,是阿尔泰地区前寒武系基底的组成部分,其中的古元古代克木齐岩群和中元古代苏普特岩群变形具有多期次和多层次的特征,不同构造层次的变形均保留了丰富的构造变形形迹。

The Material Composition and Structural Deformation of Precambrian Strata in Fuyun area,Xinjiang

The strata lithology is comprised of schist and gneiss in Altay, northwestern Xinjiang. The Altay area is a part of the Chonghuer-Qinghe structural construction zone extending from Tawunaisazi to the southern slope of the Mongolian Altai. The construction zone with special geographical location and tectonic deformation is an active research topic on development, evolution of Altai orogen. By collecting and analyzing data of material composition, metamorphism, deformation of the metamorphic rocks (Precambrian) in Altai region, and by regional stratigraphic correlation, we divided the strata into construction-rock (strata) units. We proposed the strata undergone in-depth regional dynamo-thermal metamorphism of amphibolite facies, and the strata was a part of the Precambrian basement in Altai region. The deformation of the Kemuqi Group (early Paleoproterozoic) and Supute Group (middle Paleoproterozoic) had characteristics with multi-stage and multi-level, and reserved extensive tectonic deform information in different structural levels.