寒武纪早期宽川铺生物群中圆管螺化石显微结构及显微谱学分析  

Microstructures and in-situ spectroscopic analyses of Conotheca(Orthothecide) from the early Cambrian Kuanchuanpu Biota

作　　者：苗雨霏 殷宗军[1,2,3] 吴若琳 李国祥 朱茂炎 MIAO Yu-fei;YIN Zong-jun;WU Ruo-lin;LI Guo-xiang;ZHU Mao-yan(Slate Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geologv and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China;Center for Excellence in Life and Palaeoenvironment,Chinese Academy of Sciences,Nanjing 210008,China;University of Science and Technology of China,Hefei 230026,China;College of Earth and Planetary Sciences,Universily of Chinese Academy of Sciences,Beijing 100043,China)

机构地区：[1]现代古生物学和地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008 [2]中国科学院生命演化与环境卓越创新中心,南京210008 [3]中国科学技术大学,合肥230026 [4]中国科学院大学地球与行星科学学院,北京100043

出　　处：《古生物学报》2021年第1期108-123,共16页Acta Palaeontologica Sinica

基　　金：中国科学院战略先导专项(B类)(XDB26000000);中国科学院创新交叉团队项目(JCTD-2020-18);中国科学院青年创新促进会(2017360);国家自然科学基金(42022010);现代古生物学和地层学国家重点实验室新技术项目联合资助。

摘　　要：陕南寒武系底部宽川铺组不仅保存了大量的小壳化石,还以磷酸盐化的方式立体保存了多种软躯体动物的胚胎和成体化石,为研究早期动物矿化模式、个体发育方式以及动物躯体构型的早期辐射过程提供了非常关键的信息。然而宽川铺生物群的研究大多聚焦于化石系统分类及亲缘关系探索,对生物群的沉积背景、埋藏过程和保存模式的分析甚少。本文以宽川铺生物群的核心产出层位——陕西省西乡县大河镇宽川铺组下部磷质碎屑灰岩为研究对象,对其中的一类管状化石圆管螺及其围岩进行了显微结构学和显微谱学综合分析,获得了化石显微结构和关键结构对应的元素、矿物成分等信息,讨论了管状化石圆管螺的埋藏过程和保存模式,并在此基础上对其生物学特征进行了初步探讨。该研究对理解宽川铺生物群的埋藏机制提供了新的线索。The early Cambrian Kuanchuanpu Formation in south Shaanxi Province yields not only abundant phosphatized small shelly fossils,but also various soft-bodied animals at embryonic and adult stages with three-dimensional preservation,providing a crucial taphonomic window to explore the diversity of biomineralization of early metazoans,the early evolution of development of metazoans,as well as the early evolutionary radiation process of metazoan body plans.However,the majority of previous investigations on the Kuanchuanpu Biota have been focusing on phylogenetic affinities of animal fossils,detailed taphonomic analyses of post-mortem and diagenetic processes are relatively rare.In this study,we targeted the host rocks of the Kuanchuanpu biota,phosphatic limestones from the Kuanchuanpu Formation in Dahe Town,Xixiang County,Shaanxi Province,and conducted comprehensive microscopic and spectroscopic analyses on the microtubular fossils Conotheca and the rock matrix.The results including information of spatial distribution of elements and minerals within microtubular fossils and rock matrix,spatial distribution of microtubular fossils within the rock,as well as microstructures of the microtubular fossils,provide new insights not only into the biology of these microtubular fossils,but also the preservation mechanism of the Kuanchuanpu Biota.

关 键 词：宽川铺生物群 寒武纪 磷酸盐化 埋藏学 管状化石 圆管螺属 

分 类 号：Q913.2[天文地球—古生物学与地层学]