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川西地区中二叠世—中三叠世生物相及其分区研究

DOI: 10.11867/j.issn.1001-8166.2015.05.0602, PP. 602-608

Keywords: 生物相,群落,沉积相,四川西部,二叠—,三叠纪

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Abstract:

生物相及其分区的研究对于川西地区中二叠世—中三叠世的古生物古地理、古板块等特征的恢复具有一定的参考意义。研究区内二叠系—三叠系生物化石丰富,其门类主要有腕足类、珊瑚、蜓类、菊石、牙形石、头足类、双壳类及有孔虫等。研究表明,这些生物门类的分布受沉积环境控制较为明显。在对生物群落划分和研究基础上,根据其与沉积特征的组合规律,在研究区识别出6种类型的生物相。通过对生物的生态类型、产出岩性以及对应沉积相类型等分析的基础上,建立了研究区中二叠世—中三叠世生物相模式,并详细阐述了各类型生物相中的生物类别以及典型群落等特征和含油性特征。根据生物的生态、地理分布特征及生物相在时间和空间上的组合规律,将川西地区中二叠世—中三叠世划分为3个生物相区,认为台地生物相区受控于扬子台地的发展,盆地生物相区受控于龙门—松潘海槽的发育。生物相类型的分布特征表明,台地型和缓坡型生物相主要分布于研究区的主体区域,体现了其分布主要受控于扬子台地,而深水盆地型生物相则主要分布于研究区边缘区域,反映出其分布主要受控于其北部的龙门海槽。

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