贵州寒武纪杷榔组纳罗虫(Naraoia)的古地理分布及埋藏特征  

PALEOGEOGRAPHIC DISTRIBUTION AND TAPHONOMY CHARACTERISTICS OF Naraoia FROM CAMBRIAN BALANG FORMATION IN GUIZHOU PROVINCE

作　　者：孙全义 彭进[1,2] 邵云彬 SUN Quan-yi;PENG Jin;SHAO Yun-bin(College of Resources and Environment Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;No.105 Geological Brigade,Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 550018,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]贵州大学喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025 [3]贵州省地质矿产勘查开发局105地质大队,贵州贵阳550018

出　　处：《地质与资源》2023年第3期249-260,280,共13页Geology and Resources

基　　金：国家自然科学基金项目“贵州寒武纪杷榔动物群系统古生物学、埋藏学研究”(41672005).

摘　　要：纳罗虫属作为一类已经灭绝的节肢动物,主要分布在寒武纪地层中.其中,黔东南寒武系杷榔生物群的纳罗虫保存在江南斜坡沉积相区,目前在台江革一和剑河辣子寨地区杷榔组中发现了大量纳罗虫标本.本次研究基于采自剑河辣子寨剖面的213块标本,鉴定为Naraoia taijiangensis,化石主要保存在该剖面3个化石富集层中.结合这3个化石层的岩性特征、沉积环境及化石保存状态,对N.taijiangensis的埋藏特征进行分析,发现化石保存与快速的沉积事件相关,以印痕化石保存为特征,局部有矿化现象;完整的化石个体出现在较厚的快速沉积层中;不完整的化石则多保存在相对较薄的快速沉积层中.这一发现为揭示斜坡相区杷榔生物群的埋藏特征提供了依据.Naraoia,an extinct genus of arthropod,is mainly preserved in Cambrian strata.In eastern Guizhou,the Naraoia from Cambrian Balang Biota are distributed in the sedimentary facies of Jiangnan slope,where lots of Naraoia fossils have been found in the Balang Formation in Taijiang and Jianhe areas.Based on the 213 specimens collected from Lazizhai section in Jianhe County,the fossils are identified to be Naraoia taijiangensis,which are accumulated mainly in three fossil enrichment layers.By analyzing the lithologicl characteristics,sedimentary environment and fossil preserved situation of the three fossil layers,it is confirmed that the fossil preservation is related to a rapid sedimentation event.The preservation is characterized by fossil impression,with local mineralization.The intact individuals of N.taijiangensis are found at the bottom of thick rapid sedimentary layer,while the fragmentary fossils are preserved in thinner layer.This discovery provides a basis for the burial characteristics of the Balang Biota in the slope facies area.

关 键 词：纳罗虫(Naraoia) 古地理 埋藏学 杷榔组 寒武系 贵州省 

分 类 号：Q915.5[天文地球—古生物学与地层学]