华北前寒武纪雾迷山组中的米兰科维奇驱动的旋回

来源 :1st International Palaeogeography Conference(第一届国际古地理学会议) | 被引量 : 0次 | 上传用户:shiqiuqiu100
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  天津蓟县剖面的雾迷山组碳酸盐岩地层,厚度为3300余米,沉积时限近亿年(~ 1310± 20 Ma至~1207±10 Ma)。米级旋回(类似于准层序)主导着这个巨厚的序列。这些旋回总体上属于环潮坪型,而且大多数表现为一个近似对成的岩相序列,较厚的叠层石生物层以及少量凝块石-核形石生物丘组成旋回的中部,潮坪沉积主导着旋回的上部和下部。具有古土壤层帽的泻湖-潮上坪白云质页岩构成旋回的最顶部地层。雾迷山旋回的界面是典型的暴露间断面,而且存在较为丰富的淡水成岩证据。分布较为广泛的1∶4叠加形式表明,雾迷山旋回属于6级准层序,4个准层序组成一个五级准层序组。局部,5-8个韵律层或对偶层可以在一些旋回中识别出。在六级准层序内的韵律层的叠加形式,以及六级准层序组成五级准层序组的垂直叠加形式,被解释为米兰科维奇韵律所控制的环境振荡变化的结果,即岁差、短偏心率和长偏心率叠加的结果。旋回序列的较为普遍的1∶4叠加形式,以及局部的1∶5-8的旋回内的韵律层的叠加形式,表明中元古代的米兰科维奇韵律具有与显生宙相似的比率。根据旋回的叠加形式,可以在雾迷山组中识别出26个三级层序,并进一步归并成6个二级层序,即海侵-海退巨层序(或层序组),所有这些特征均表明了一个复合的而且具有序次的相对海平面变化。
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