李伟同,刘耕武,Dennis R.Braman,曹卫生,陈钦保,Don Brinkman

• 1:长江大学地球科学学院
• 2:中国科学院南京地质古生物研究所
• 3:加拿大特瑞尔皇家古生物博物馆
• 4:中国石化江汉油田分公司勘探开发研究院

摘要(Abstract)：

陆生恐龙的绝灭是白垩系-古近系界线事件中最引人注目的。陆相地层是恐龙绝灭等事件信息的重要载体。全球白垩纪、古近纪陆相地层发育、分布广泛,单一的白垩系-古近系全球界线层型(GSSP)不能满足建立一个明确而可操作的界线标准的需要,建立陆相白垩系-古近系界线层型很有必要,其意义和重要性实际上不亚于建立GSSP。中国的白垩系、古近系绝大多数为陆相沉积,且陆相白垩系-古近系界线方面存在许多问题,而中国目前正在做陆相地层建阶和完善"中国区域年代地层表"工作,不解决好陆相白垩系-古近系界线问题,中国古近系最下面的一个阶便建不好,"中国区域年代地层表"将不完善,所以建立陆相白垩系-古近系界线层型对于中国更加迫切并具实际价值。全球白垩纪-古近纪过渡时期(特别是古新世早期)的连续陆相生物地层记录十分匮乏,寻找合适的剖面建立陆相白垩系-古近系界线层型非常困难。从轮藻角度出发,湖北当阳跑马岗组露头剖面拥有全球迄今所知最连续丰富多样的白垩纪-古近纪过渡时期特别是古新世早期的陆相生物地层记录。界线层段的介形类生物地层记录也非常连续且丰富多样,并具建立界线层型的其他许多条件。它是中国至今所知惟一具有潜力成为全球(或大区性、或中国)的陆相白垩系-古近系界线层型、也即中生界-新生界界线层型的候选剖面(露头剖面),从而也可能是中国古近系、也即新生界最下面一个阶的最合适的建阶剖面或层型剖面。为此,湖北当阳陆相白垩系-古近系界线层型问题无疑值得重视和深入研究。

关键词(KeyWords)： 层型剖面;轮藻化石;陆相;白垩系-古近系界线;当阳剖面;湖北

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(No.40072009)资助

作者(Author): 李伟同,刘耕武,Dennis R.Braman,曹卫生,陈钦保,Don Brinkman

DOI: 10.19839/j.cnki.dcxzz.2010.02.013

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