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一、川东、鄂南地区石炭系概况早石炭世早期(岩关期),该区是扬子古陆的一部分,缺失沉积。晚期(大塘期),由于华南海海水自东而西侵入,形成了一条由黄石—沙市—恩施直至川东石柱的一个东西向海槽。海槽中沉积了一套滨海平原及滨岸潮坪相的碎屑夹煤层沉积物。沉积物下段为杂色粘土岩夹灰白色粉砂岩、细砂岩及1—2层薄煤层,含植物化石。上段为褐黄色钙质粘土、灰白色石英砂岩、粉砂岩、粘土岩夹生物碎屑灰岩透镜体及一层铁锰矿。一般厚0—40米,沉积最厚地区在长阳以南,达70多米。中石炭世,由于海侵范围扩大,海水向西侵进到重庆、达县、万县一带及鄂南大部
First, the eastern Sichuan, Hubei Province, the Carboniferous Overview Early Carboniferous early (rock Guan period), the area is part of the Yangtze ancient land, the lack of sediment. In the late period (Datang Period), an ocean east-west channel formed from Yellowstone-Shashi-Enshi up to the east Sichuan pillar was formed due to the invasion of seawater from the east and west of the South China Sea. In the trough, a set of clastic interbed sediments of coastal plains and coastal tidal flat sediments were deposited. The lower part of the sediment is a variegated clay rock with gray siltstone, fine sandstone and 1-2 thin coal seams, including plant fossils. The upper section of the brown-yellow calcareous clay, gray-white quartz sandstone, siltstone, clay rock clastic bioclastic limestone lens and a layer of ferromanganese. The general thickness of 0-40 meters, the thickest sedimentary area south of Changyang, more than 70 meters. In the Carboniferous, due to the expansion of the transgression, seawater invaded the west to Chongqing, Daxian, Wanxian areas and most of southern Hubei