西藏羌北地区早泥盆世地层的发现及平沙沟组的建立DISCOVERY OF EARLY DEVONIAN STRATA IN NORTHERN QIANGTANG,TIBET,AND THE ESTABLISHMENT OF THE PINGSHAGOU FORMATION
程立人,陈寿铭,张以春,程新
摘要(Abstract)：
西藏羌北地区从未发现过有可靠化石依据的晚二叠世以前的沉积地层,是否存在这些地层是目前诸多地质工作者关注的问题之一。在西藏进行地质调查时,发现一套含双壳类Eoschizodus roemeri,E.minor,E.inflatus,Actinodesma(Actinodesma)cf.mallei forme,A.(Actindesma)cf.vespertilio等和腕足类Huananochonetes subquadratus等的地层,这些化石的分布时代均为早泥盆世晚期(Emsian)。据此,确定产上述化石的地层为下泥盆统上部,并命名为平沙沟组。这是在西藏羌北地区首次发现早泥盆世地层。证实了羌北地区有晚二叠世以前沉积地层的存在,为研究羌北地区古生代中期的构造活动、演化、古地理分布格局及古生物地理区划提供了新资料。
关键词(KeyWords)： 生物地层;双壳类;腕足类;平沙沟组;早泥盆世;羌塘;西藏
基金项目(Foundation): 中国地质调查局“1/25万《西藏玛依岗日幅》区域地质调查”项目(I45C003002)部分成果
作者(Author): 程立人,陈寿铭,张以春,程新
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