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STUDY ON BIOSTRATIGRAPHY AND EARLY PHYLOGENETIC EVOLUTION OF CAMBRIAN RADIOLARIA AND SILICEOUS SPONGE-SPICULES

寒武系放射虫和硅质海绵骨针的生物地层学及早期系统发育演化研究

基本信息

批准号：
09640552
负责人：
IWATA Keiji
金额：
$ 2.43万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640552/
关键词：
Altai Mountains Cambrian Radiolaria Siliceous sponge Biostratigraphy Phylogenetic Evolution

项目摘要

Radiolarian and sponge-spicules biostratigraphic study of the siliceous sedimentary rocks from the Cambrian Systems in the Altai and Batenev Mountains, central Asia, was carried out for 4 years. Late Cambrian-Early Ordovician radiolariansand conodonts were obtained from the Zasurin Formation, central Altai Mountains. Radiolarians with inner and outer shell (paleoentactinids) were discovered for the first time from the Late Cambrain strata. This suggeststhat radiolarians were already differentiated during late Cambrian. And well-preserved multi-spined radiolarians with single outer shell and abundant siliceous sponge-spicules were obtained from vari-colored siliceous shales of the Early Cambrian (Botomian stage) Shashkunar Formation. A few groups of radiolarians belonging to new genera (Altaisphaera and Paleocenosphara) and species were found. Description of these radiolarians was carried out. This group of radiolarians are the oldest ones in the world. Sponge-spicules were also obtained from the Lower Cambrain Unnamed Formation, Mt.Blizhnyaya, and the Middle Cambrian Karask Formation in Batenev mountains and Ust'Sema Formation, central Altai Mountains. By comparative faunal analysis of Cambrian radiolarians and sponge-spicules reported from other countries, the author proposed a provisional biostratigraphic zonations of radiolarians and sponge-spicules during the whole period of the Cambrian.

对中亚阿尔泰山和巴捷涅夫山寒武系硅质沉积岩的放射虫和海绵针生物地层学研究进行了四年。晚寒武世-早奥陶世放射虫和牙形刺获自阿尔泰山脉中部扎苏林组。首次在晚寒武纪地层中发现具有内壳和外壳的放射虫（古刺动物）。这表明放射虫在寒武纪晚期就已经分化。在早寒武世（波托姆期）Shashkunar 组彩色硅质页岩中获得了保存完好、外壳单一、硅质海绵针状物丰富的多刺放射虫。发现了一些属于新属（Altaisphaera 和 Paleocenosphara）和种的放射虫类群。对这些放射虫进行了描述。这群放射虫是世界上最古老的。海绵针还产自布利日尼亚山下寒武统无名地层、巴捷涅夫山中寒武统卡拉斯克地层和阿尔泰山脉中部的乌斯季塞玛地层。通过对国外报道的寒武纪放射虫和海绵骨针的区系比较分析，作者提出了整个寒武纪放射虫和海绵骨针的暂定生物地层分区。