四川盆地龙马溪组笔石组合特征与沉积环境关系探讨
首发时间:2015-03-09
摘要:四川盆地龙马溪组中的笔石化石具有保存完好、分布广泛、演化快、特征明显的特点。本文根据前人已有的资料和在研究区中采得的标本,从属种鉴定、笔石带划分、沉积相分析等方面进行了研究。在研究区龙马溪组自上而下划分出六个笔石带,笔石丰度、分异度和形态都有很大变化。沉积环境从深水陆棚沉积环境转变为浅水陆棚环境,沉积环境的改变对笔石组合特征有着重要影响。
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Study of The Relationship between Assemblage Characteristics of Graptolite in Longmaxi Group and Sedimentary Environment in Sichuan Basin
Abstract:The graptolite in Longmaxi group in Sichuan basin is well-preserved, wide-spreading, fast-evolution and its distinct characteristic. In this paper, according to previous data and the specimen of the study area, I carry on a research at subordinate species identification, graptolite zone division, sedimentary facies analysis and so on. In the study area, the Longmaxi group is divided into six Graptolite zones, the abundance, diversity and morphology of graptolite have changed a lot. The sedimentary environment changed from deep shelf to shallow shelf, which have an importance influence to the assemblage characteristics of graptolite.
Keywords: Paleontology Longmaxi group Graptolite Assemblage characteristics Sedimentary environment
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No.4632592103206914****
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