房强,景秀春,邓胜徽,王训练

• 1:中国地质大学(北京)地球科学与资源学院
• 2:中国石油勘探开发研究院

摘要(Abstract)：

在四川北部广元上寺剖面茅口组—吴家坪组首次发现了重要的牙形石属种Clakina postbitteri postbitteri、C.postbitteri hongshuiensis、C.dukouensis和C.asymmetrica,识别出8个牙形石带,自下至上依次为Jinogondolella nankingensis带、J.aserrata带、J.postserrata带、Clarkina postbitteri postbitteri带、C.dukouensis带、C.asymmetrica带、C.guangyuanensis带和C.orientalis带。比较精确地确定该剖面瓜德鲁普统-乐平统界线以Clarkina postbitteri postbitteri的出现为标志,使该剖面成为川北一个发育较为连续的、可与国内外同期地层精确对比的牙形石带序列的重要剖面。根据上寺剖面的岩性与牙形石产出状况分析,认为前乐平统生物灾变事件至少部分受到火山活动影响,灾变事件在本剖面响应的时间应在J.postserrata带晚期直至乐平统-瓜德鲁普统的界线处,持续时间相对较长。

关键词(KeyWords)： 生物地层;牙形石;罗德阶;沃德阶;卡匹敦阶;吴家坪阶;二叠系;上寺剖面;广元;四川

Abstract:

Keywords:

基金项目(Foundation): 国家重大科技专项“大型油气田及煤层气开发”课题(2008ZX05004);; 中国石油天然气股份有限公司重大专项“海相碳酸盐岩大油气田勘探开发关键技术”项目(2008E-0702)资助

作者(Author): 房强,景秀春,邓胜徽,王训练

DOI: 10.19839/j.cnki.dcxzz.2012.04.002

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