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Phylogeny and classification of Permian Radiolarians

二叠纪放射虫的系统发育和分类

基本信息

批准号：
07640622
负责人：
TAKEMURA Atsushi
金额：
$ 1.09万
依托单位：
Hyogo University of Teacher Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

A phosphate nodule from Chichibu Terrane in central Shikoku and limestone and chert samples from the Waipapa Terrane, New Zealand were used in this research to clarify the taxonomy of Late Permian radiolarian fauna and their faunal composition. The results of this research are the follows :1. Observations of internal structures of Late Permian albaillellarians were made using scanning electron microscope. Phylogenetic relationships and classification of Permian genera Albaillella, Pseudoalbaillella, Follicucullus and Neoalbaillella are examinated.2. Unknown radiolarians of several groups were observed in the fauna from the phosphate nodule from Chichibu Terrane. Most of them can be classified as new genera. Because it is difficult to observe internal structures, the research of these groups is still continued.3. Middle to Late Permian radiolarians from the northern part of Waipapa Terrane were reported, as well as the detailed lithostratigraphy of Arrow Rocks composed of an almost continuous section of basalts with limestones, bedded cherts and siliceous mudstones. Middle to Late Permian radiolarians occurred in a limestone lens and bedded chert from Arrow Rocks (Takemura et al., in press).4. Well-preserved albaillellarians from the limestone lens in Arrow Rocks were described including two new species of Genus Follicucullus, F.sphaericus and F.whangaroaensis (Takemura et al., now submitting).Other than these results, Early to Middle Triassic radiolarians occurred in siliceous mudstones from Arrow Rocks, and black shale unit in Arrow Rocks can be correlated with Permian/Triassic boundary.

这项研究使用了四国中部秩父地体的磷酸盐结核和新西兰怀帕帕地体的石灰岩和燧石样品，以阐明晚二叠世放射虫动物群的分类及其动物群组成。本研究的结果如下： 1．利用扫描电子显微镜对晚二叠世阿尔贝勒动物的内部结构进行了观察。对二叠纪Albaillella属、Pseudoalbaillella属、Follicucullus属和Neoalbaillella属的系统发育关系和分类进行了研究。 2．在秩父地体磷酸盐结核的动物群中观察到了几个类群的未知放射虫。其中大多数可以归类为新属。由于内部结构难以观察，这些类群的研究仍在继续。 3．报告了来自怀帕帕地体北部的二叠纪中晚期的放射虫，以及箭岩的详细岩石地层学，该岩层由几乎连续的玄武岩部分、石灰岩、层状燧石和硅质泥岩组成。中晚二叠世放射虫出现在箭岩的石灰岩透镜体和层状燧石中（Takemura 等人，正在出版）。4．描述了来自箭岩石灰岩透镜体的保存完好的阿贝拉虫，包括两个新种 Follicucullus，F.sphaericus 和 F.whangaroaensis（Takemura 等人，现已提交）。除这些结果外，早三叠世至中三叠世的放射虫出现在箭岩的硅质泥岩中，箭岩中的黑色页岩单元可以与二叠纪/三叠纪边界。