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地质论评  2001 

旋回年代学及其应用意义--华北地台中寒武世碳酸盐岩鲕滩高频旋回的年代学研究

Keywords: 碳酸盐岩,鲕滩,米兰柯维奇旋回,年代,中寒武世,华北

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Abstract:

华北地台中寒武世鲕滩碳酸盐岩沉积序列中发育大量分属4~7级的高频层序,依据旋回平均厚度的频率分布、不同级别旋回叠加样式和比率、沉积发育样式和跨越整个地台的可对比等特征认为,它们受控于地球轨道参数变动,是典型的米兰柯维奇旋回,其中Ⅳ、Ⅵ级分别对应于长、短偏心率旋回,时限分别为0.4Ma和0.1Ma.应用轨道旋回规则的周期间隔给出了中寒武世各级层序、地层阶和相应界面的年龄值.

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