The Stratigraphy Features And Tectonic Evolution From Late Paleozoic To Early Mesozoic In Xiagaochuan Area In Xixiang County, Shanxi Province

Uique stratum sequence spread out Xiagaochuan area in Xixiang county, Shanxi province, that loss Ordovician, Silurian, low- and middle-Devonian, have the stratum from Late Devonian to Early Triassic, this is different from around the stratum. Obviously deformation, the folds and faults taken place in the region. Ancestors did most researching work , but never have 1∶50000 region geological survey in the area. The author take part in the 1∶50000 region geological survey project that preside over by professor Pei Xianzhi, through the yield geological mapping, grasping the detailed geological circumstances, recognizing the geological settings in Chuhe area, mainly start from lithostratic units, through division and contrast of lithostratic units, and determine the sedimentary facies and the environment, the contacts between rock units, as well as the formation of the units constructed forms, so as to rehabilitation and reconstruction of the region's geological evolution history. Made the following points awareness:1. Basid on materials of the predecessor and the 1∶50000 investigate achievement, farther divided and confirmed the stratum in Devonian to Carboniferous. From the bottom of a rock formation divided into six units: Tiekuangliang Formation and Panlongshan Formation of the top Devonian, Chayipo Formation and Zhanpo Formation of the low Carboniferous, and Dapu Formation and Maping Formation of the top Carboniferous.2. The shallow trough at Gaochuan basin in Devonian to Carboniferous, experienced a coastal beaches from the initial deposit into a gentle slope of the Carboniferous carbonate platform and then to flanger carbonate shelf system evolution, and it will rise to the formation around a land formation missing.3. Yangtze block and Qinling Mountains extended by the ancient Tethys tectonic effects of separation in Devonian, and Yangtze block in some areas in the northern margin rift formed trough, And shallow water during the Late Devonian to Carboniferous, but the scope has expanded.4. The deep basin exist in the Xiagaochuan aera in Permian, it is Mianlue Ocean extension of the east. The Xiagaochuan aera as a whole Mianlue belt strongly rift in Permian, and Emeishan continental flood basalt eruption response to each other, indicates that the extension of the regional tectonic setting, which is response to the China's ancient Tethys expansion in Permian. 5. In the Triassic, including Xiagaochuan aera of the entire Zhenba region, roughly the same stratum sedimentary sequence, indacates that, Xiagaochuan aera , the Yangtze Block and the north of it have the same sedimentary environment from the Triassic...