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Characteristics and Geological Significance of Seismites of the Doushantuo Formation in Xikou, Hunan Province
Author(s): 
Pages: 1032-1041
Year: Issue:  6
Journal: Acta Sedimentologica Sinica

Keyword:  seismitesseismic structureseismic sequencegeological significanceDoushantuo FormationEdiaca-ran;
Abstract: 湘西慈利溪口地区震旦系陡山沱组地层中首次发现碳酸盐岩原地震积岩。笔者通过剖面实测,详细观察和描述,结合构造背景,识别出阶梯状层内断层、液化碳酸盐岩脉、液化角砾岩、负荷构造以及微褶纹理等典型的震积软沉积变形构造的地质记录;震积序列在剖面结构上显示自下而上由下伏未震动层一阶梯状层内断层一微褶皱层一液化碳酸盐岩层一液化角砾岩层一上覆未震动层的渐变过程及震积作用逐渐衰减的趋势。震积岩发育的层位在时空上显示良好的可对比性,反映陡山沱期晚期构造活动强烈,并具备多旋回、多周期的特点。构造的活跃加速了有机碳库的氧化,为该时期多细胞生物的繁盛和大规模的成磷成矿作用奠定了基础;同时保存完好的震积地层记录对推断研究区的古沉积环境也具有重要意义。
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