小壳化石型化石在奥陶纪、志留纪的分布规律及其保存特征  

DISTRIBUTION AND PRESERVATION CHARACTERISTICS OF SMALL SHELLY FOSSIL-STYLE ASSEMBLAGES IN THE ORDOVICIAN AND SILURIAN

作　　者：陈栎蓉 李向东[1] 黄烈斌 申岑[1] CHEN Lirong;LI Xiangdong;HUANG Liebin;SHEN Cen(Land and Resources Engineering of Kunming University of Science and Technology,Kunming 650031)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650031

出　　处：《微体古生物学报》2021年第4期311-320,共10页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金重点项目(批准号:41730318,41272119);云南省高层次人才培养支持计划“青年拔尖人才”专项的支持。

摘　　要：小壳化石型(Small Shelly Fossils-style)化石作为产出于寒武纪以后,个体微小、原生或次生矿化(以磷酸盐化为主)的后生动物遗骸,常常以微体内核(microsteinkern)形式保存。它们的保存与寒武纪小壳化石的保存方式相同,可能都与古海洋的环境变化存在密切的联系,为古环境研究提供重要的线索。本文在综合整理已有文献基础上,分析了自寒武纪以后,此类型化石组合的地史分布及物种变化规律,可看出与寒武纪小壳化石组合相比,虽然此类化石组合在全球多地均有记录,但数量及物种多样性均显著下降,其物种组成以软体动物、棘皮动物为主。同时,文中结合云南永善地区发现的志留纪小壳化石型化石组合,与寒武纪小壳化石进行对比,总结了此类化石的保存特征,为从微观角度研究早古生代时期生命演化及其埋藏模式提供了又一重要线索。Small shelly fossil-style fossils refer to a variety of different metazoan fossils found after the Cambrian.These minute fossils are primarily or secondarily mineralized(mainly phosphatized),and usually preserved in the form of“microsteinkerns”.They are similar in preservational mode with the Cambrian small shelly fossils,probably due to the close association with the taphonomic changes related to the paleoceanography,and may provide essential clues for recognizing the paleoenvironments.Based on a comprehensive review of the existing literature,this study analyzes the changes of the taxonomic abundance and quantity of these post-Cambrian fossils.During the Ordovician and Silurian,there were obvious similarities in conservation patterns of animal lineages obtained from different areas,and some of which,such as Mollusca,appeared more frequently.The preservation characteristics of the Silurian small shelly fossil-type fossils found in the Yongshan,Yunnan Province,are compared with those of the Cambrian small shelly fossils.The small shelly fossil-style microfossils provide us with another important clue to study the evolution of life and its taphonomic patterns from a microscopic perspective during the Early Palaeozoic.

关 键 词：小壳化石型保存 保存特征 化石组合 地史分布 

分 类 号：Q915.2[天文地球—古生物学与地层学]