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Identification and Description of Parasequences in Upper Ma5 Member, Central Ordos Basin
Author(s): 
Pages: 747-751
Year: Issue:  S1
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  陕甘宁盆地中部 马五段上部 准层序 特征;
Abstract: 根据多种资料在陕甘宁盆地中部马五段上部划分出8个准层序,对每个准层序作了详细的描述,它们大多与自然伽玛曲线对应良好,且均为米级规模,顶部多为含膏云坪微相,反映持续暴露的证据充分,认为它们是由他放回作用形成的。受海平面升降的控制,准层序内δ13C值先升后降,并且由于其形成的早期和晚期石膏和石盐含量各不相同准层序内孔隙度和残余含盐量逐渐升高。准层序内泥质和有机质的含量变化也导致酸不溶物含量逐渐降低。岩石的高孔隙带多分布于暴露型准层序的上部或顶部。
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