The Lithofacies and Paleogeography of Upper Palaeozoic in the Fuhai Area of North Xinjiang
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摘要: 新疆北部福海地区处于西伯利亚与哈萨克斯坦两大古板块的汇聚带,构造活动强烈,属岛弧及弧后盆地构造环境。上古生界沉积盆地类型多种多样,有洋盆、残留海盆地、岛弧盆地、陆缘弧盆地及陆内裂陷盆地等;岩相类型齐全,深海、浅海、滨海、三角洲及河、湖、沼泽均有发育。沉积相带分布复杂,同一地区多种亚相交替发育形成混合亚相带。晚石炭世,海水彻底退出,陆相完全取代了海相,古气候也相应发生剧变。早二叠世末期基本上结束了古生代的沉积历史,普遍缺失晚二叠世的沉积。Abstract: The Fuhai area of north Xinjiang is situated in the convergent zone between Siberia Plate and Kazakstan Plate. This area was in an island arc and retroarc basin environment so that its structure activity is violent. There exists many kinds of depositional basins in the Upper Palaeozoic, such as oceanic basin, remnant oceanic basin, island-arc basin, bycontinentalarc basin, intracontinental basin, and so on. There are all kinds of lithofacies: deep-sea,shallow sea, coastal sea, deltaic and fluvial, lacustrine, and swamp facoes. Lots of mixed subfacies zones cause the complex distribution of factes zones. Because of the seawater's withdrawal, continental factes replaced marine factes completely in the Late Carboniferous. Resultantly,the Paleoclimate appeared remarkably different. The Palaeozoic deposition ceased by the end of Early Permian.
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Key words:
- volcaniclastic rock /
- lithofacies type /
- subfactes tract /
- sedimentary system /
- sedimentary evolution /
- Fuhai area
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