中国早期具刺疑源类的演化及生物地层学意义  

THE EARLY EVOLUTION OF THE ACANTHOMORPHIC ACRITARCHS IN CHINA AND THEIR BIOSTRATIGRAPHICAL IMPLICATION

作　　者：尹崇玉[1] 高林志[1] 

机构地区：[1]中国地质科学院地质研究所

出　　处：《地质学报》1995年第4期360-371,T002,共13页Acta Geologica Sinica

基　　金：国家自然科学基金;地质行业科学技术发展基金(编号 49172071)

摘　　要：本文以我国晚元古代至早寒武世梅树村阶中发现的具刺疑源类化石为基础,结合最近研究的新资料。通过对具刺疑源类化石组合特征、形态对比、微细结构和演化关系的研究,并与国内外资料广泛对比。探讨了我国早期具刺疑源类的演化阶段、各阶段的组合特征及生物地层学意义,论证了我国早期具刺疑源类的演化发展趋势。On the basis of new advances in the study of the acanthomorphic acritarchs of the Late Proterozoic to the Early Cambrian Meishucun Stage in different regions of China, coupled with a world-wide correlation of the fossils, the authors consider that the early evolution of the acanthomorphic acritarchs in China roughly involves four stages; from older to younger they are as follows. (1) the first stage (pre-Doushantuo' stage) is characterized by the occurrence of Shuiyousphaeridium macroreiiculatum (Du) Yan, Shuiyousphaeridium membraniferum Yan, Trachyhystrichosphaera siricta Hermann, Cymatiosphaeroides sp. and other spheroidal vesicles with small processes (Trachyhystrichosphaera sp.)Most of them are 100-250 μm in diameter, and bear unmerous tube-like, hollow, branched or unbranched processes, commonly with an outer membrane at the tips and reticular structure on the surface. (2) The second stage (the Doushantuo stage) is characterized by the presence of an assemblage of large and morphologically complex acritarchs dominated by Tianzhushania spinosa (L. Yin et Li)C. Yin, Tianzhushania polysiphonia C. Yin, Comasphaeridium magnum Zhang, Echinosphaeridium maximum (L. Yin) Knoll, Ericiasphaera spjeldnaeii Vidal, Trachyhystrichosphaera sp., Briareus borealis Knoll etc. The distinctive acritarch assemblage occurring after the Nantuo ice stage and before the Ediacaran faunal radiation stage can be obviously distinguished from the assemblage of the first stge. (3) The third stage (the Dengy-ing stage) is marked by the occurrence of smaller spinouse acritarchs, such as Micrhystridium sp., Cymatiosphaera sp., and Baltisphaeridium sp. Most species of large, morphologically complex acritarchs disappeared at about the time of Ediacaran faunal radiation. (4) The fourth stage (the Meishucun stage) witnessed the dominance of Micrhysiridium lanceolatum L. Yin, Micrhystridium echinuatum Luo et Wang, Micrhystridium minimum Xing, Paracymatiosphaers regular is Wang, and Paracymatiosphaera irregularis Wang. The new radiation stage of a

关 键 词：具刺疑源类 晚元古代 演化阶段 生物地层学 

分 类 号：Q911.63[天文地球—古生物学与地层学]