Construction of Global standard of micropaleontology at the Triassic/Jurassic boundary

三叠纪/侏罗纪边界微体古生物学全球标准构建

基本信息

批准号：
13640471
负责人：
HORI Rie
金额：
$ 1.02万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640471/
关键词：
Radiolaria Biostratigraphy Inuyama Triassic Jurassic boundary Mass extinction IGCP 458 Queen Charlotte Islands International correlation 放散虫生層序 T J境界ジュラ系ニュージーランド:カナダ

项目摘要

We have obtained the following results through this Triassic/Jurassic (T/J) boundary research project on micropaleontology,1) Pantanellium tanuense is considered to be one of global index species of Hettangian age (Earliest Jurassic). Archaeocenosphaera laseekensis and Praehexasaturnalis tetraradiatus are also good indicators for the Hettangian.2) The end of Triassic is marked by the final occurrences of Globolaxtorum tozeri, Hagiastrid? gen.et sp.Indet A, and Risella spp.3) The characteristic taxa, Spongotrochus sp.(Carter 1994) and Canoptum spp.are recognized, which occur across the T/J boundary surviving the mass extinction at the end of Triassic. Observation of Living Radiolaria suggests that the Canoptum spp.have tolerance of the crisis of end of the Triassic because of its unique feeding system that differs from other extinct multicyrtids.4) The pattern of the faunal turnover across the T/J boundary is similar between Japan (Inuyama) and Canada (Queen Charlotte Islands) although there are differences among faunal contents and dominated species. The faunal change is subdivided into 3 stages.5) Trough faunal comparison between Japan, Philippine, New Zealand and Canada, the faunal affinity around the T/J boundary is strong between Japan and Philippine, and also New Zealand and Canada.

通过本次三叠纪/侏罗纪（T/J）边界微古生物学研究项目，我们获得了以下成果：1）Pantanellium tanuense被认为是Hettangian时代（最早侏罗纪）的全球指标物种之一。 Archaeocenosphaera laseekensis 和 Praehexasaturnalis tetraradiatus 也是 Hettangian 的良好指标。2) 三叠纪末期的标志是 Globolaxtorum tozeri、Hagiastrid? 的最终出现。 gen.et sp.Indet A 和 Risella spp.3) 识别出特征类群 Spongotrochus sp.(Carter 1994) 和 Canoptum spp.，它们跨越 T/J 边界，在三叠纪末的大规模灭绝中幸存下来。对活体放射虫的观察表明，Canoptum spp.由于其独特的摄食系统不同于其他已灭绝的多囊虫，因此能够耐受三叠纪末的危机。 4）跨越T/J边界的动物群更替模式与日本（犬山）和加拿大（夏洛特皇后群岛）虽然动物区系内容和优势种存在差异。动物区系变化分为3个阶段。5)通过日本、菲律宾、新西兰和加拿大之间的动物区系比较，日本和菲律宾、新西兰和加拿大之间T/J边界附近的动物区系亲和力较强。