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The Identification and Its Significance of the Three Unconformity Surfaces of the Paleozoic Stratigraphic Profile in Halaqi Area in Southwestern Tianshan Mountains, Xinjiang
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摘要


     Halaqi region is located in Southwest Tianshan-Northwest Tarim Basin. Its the front region of collision between Tarim Block and Kazakhstan-Siberia Block. Cambrian-Permian strata with slight metamorphism outcropped in this area, where we discover three unconformity surfaces, namely angular unconformity in Permian-Cenozoic, parallel unconformity in Ordovician-Silurian and parallel unconformity in Devonian-Carboniferous. The unconformity is bordered by Aferpaqueyiqieke vault anticlinorium. The sedimentary environment on both sides of Silurian-Permian is greatly different. The metamorphism in Ordovieian and Cambrian composed of anticline is different from that of overlying strata. According to regional geology and evolution,the parallel unconformity in Ordovician-Silurian was corresponding to the regional Qilian Movement. The parallel unconformity in Devonian-Carboniferous was corresponding to the middle Tianshan Movement. The angular unconformity in Permian-Cenozoic was influenced by the end of Tianshan Movement.

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