中天山卡瓦布拉克一带古地壳层圈结构特征

中天山卡瓦布拉克一带，受长期掀斜隆升剥蚀，显示古地壳具层圈结构，盖层为火山岩，由于剥蚀局部残留，上地壳由劈理带和结晶片岩带组成；中地壳为塑性流变层，由板状韧流带和环状重熔岩带构成；下地壳仅见呈热隆上升的环状中基性杂岩性。板状韧流带具大型韧性剪切变形特征，中基性杂岩为下地壳热隆岩浆上升，并使中地壳岩石形成重熔型花岗岩，共同构成环状杂岩体。该地壳层圈结构形成于新疆古大陆震旦－寒武纪裂解及准噶尔洋盆发育过程中。

PALEO-CRUST STRUCTURES OF THE MIDDLE TIANSHAN MOUNTAINS IN KAWABULAKE, XINJIANG

The long-term uplift and erosion reveal that the paleo-crust of the middle Tianshan mountains in Kawabulake has a feature of layered structure. The cover rocks are volcanic rocks. The localized relics after erosion show that the upper crust is composed of a cleavage zone and a crystalline schist zone. The middle crust with plastic deformation consists of a platy ductile flow zone and a ring-shaped re-melting zone. The latter is characterized by large-scale ductile shearing. Only ring-shaped intermediate-basic complexes are visible for the lower crust, which are caused by re-melting of the rocks of the middle crust due to the thermal up-warping. The crust structures resulted from the opening of Junggar oceanic basin due to the separation of paleo-continent of Xinjiang during the Sinian-Cambrian, and uplift of the middle Tianshan mountains.