四川江油吉安村养马坝组古生物化石特征及其环境探讨  

Paleontology fossil characteristics and environment discussion of Yangmaba Formation in Ji'an Village,Jiangyou City,Sichuan

作　　者：谭耕莉 李志伟 赵波 李瑞 王仕海 倪凡 TAN Gengli;LI Zhiwei;ZHAO Bo;LI Rui;WANG Shihai;NI Fan(Regional Geological Survey Brigade of Sichuan Bureau of Geology and Mineral Exploration and Development,Chengdu 610213,Sichuan,China)

机构地区：[1]四川省地质矿产勘查开发局区域地质调查队,四川成都610213

出　　处：《矿产与地质》2023年第3期571-577,共7页Mineral Resources and Geology

基　　金：四川省自然资源科研项目“川东南地区古生物化石遗迹调查及保护规划研究”(编号:Kj-2022-〔26〕)资助。

摘　　要：四川江油吉安村一带养马坝组保存有丰富的古生物化石,主要包括腕足、头足、珊瑚和棘皮动物化石,尤以腕足化石数量最多,化石时代均指向早—中泥盆世。腕足化石大部分介壳保存完整,沉积状态均为平卧稳定状态沉积,无明显搬动迹象,属于原地埋藏或近原地埋藏。吉安村一带岩性组合具有典型陆源碎屑和碳酸盐在同一沉积体系或背景下混积沉积特征,结合地层中保存的化石组合特征和化石埋藏特征,初步分析吉安村腕足化石沉积环境为碎屑混积陆棚沉积环境。There are abundant paleontological fossils in Yangmaba Formation at Ji'an Village,Jiangyou City,Sichuan,mainly including brachiopod,cephalopod,coral and echinoderm fossils,especially brachiopod fossils.The fossil ages all point to the Early to Middle Devonian.Most of the shells of the brachiopods are well preserved,and the sedimentary state is supine and stable,without obvious sign of movement,which belongs to in situ burial or near in situ burial.The lithological assemblage in Ji'an Village area has the typical sedimentary characteristics of mixed deposition of terrigenous detritus and carbonate in the same sedimentary system or background.Combined with the characteristics of fossil assemblages and fossil burial preserved in the strata,the sedimentary environment of Ji'an Village brachiopods is preliminarily analyzed as the continental shelf sedimentary environment of detritus mixed deposition.

关 键 词：养马坝组 腕足化石 埋藏特征 沉积环境 

分 类 号：Q915.2[天文地球—古生物学与地层学]