Oceanic change of Northwest Paleo-Pacific during Jurassic based on radiolarian research

基于放射虫研究的西北古太平洋侏罗纪海洋变化

• 批准号: 09640559
• 负责人: YAO Akira
• 金额: $ 1.98万
• 依托单位: Osaka City 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 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640559/
• 关键词: radiolaria; Jurassic; Paleo-Pacific; 放散虫化石; 海洋環境変動

This project had a subject to consider the change of oceanic environment in the northwestern Paleo-Pacific during Jurassic time. The data based on Jurassic radiolarian faunas were gotten from the Jurassic accretionary complexes of the Tanba-Mino and Chichibu terranes in southwest Japan. The radiolarian research was focused on the faunal analysis by means of identification of whole species occurred from each samples.It was clarified that the specific number of radiolarian fauna was decreased around the Triassic/Jurassic boundary. This phenomenon is considered to be affected by the mass extinction event of Triassic/Jurassic boundary. The Toarcian event, which was represented by the oceanic anoxia, also affected the specific number of radiolarian fauna. Although the faunal change of radiolarians was slow from middle Toarcian to early Aalenian time, it was fast from late Aalenian to Bajocian time. This phenomenon may be related to the change of oceanic environment caused by the development of Central Atlantic Seaway.

本课题研究的主题是研究侏罗纪时期西北古太平洋的海洋环境变化。侏罗纪放射虫动物群的资料来自日本西南部丹波-美浓和秩父两个侏罗纪增生杂岩。放射虫的研究主要集中在对每个样品进行全种鉴定的动物群分析上，明确了在三叠纪/侏罗纪界线附近放射虫动物群的具体数量有所减少。这一现象被认为是受三叠纪/侏罗纪界线生物大灭绝事件的影响。以海洋缺氧为代表的多阿尔期事件也影响了放射虫动物群的比数。从Toarcian中期到Aalenian早期，放射虫的区系变化缓慢，但从Aalenian晚期到Bajocian时期，放射虫的区系变化迅速。这一现象可能与中大西洋航道的开发引起的海洋环境变化有关。

项目成果

KUWAHARA Kiyoko and YAO Akira: "Diversity of Late Permian radiolarian assemblages" NOM, Spec.Vol., no.11. 33-46 (1998)

KUWAHARA Kiyoko 和 YAO Akira：“晚二叠世放射虫组合的多样性”NOM，Spec.Vol.，no.11。

桑原希世子 他: "ペルム紀新世放散虫化石群集の多様性" 大阪微化石研究会誌,特別号. 11. 33-46 (1998)

Kiyoko Kuwahara 等：“二叠纪-中部放射虫化石组合的多样性”大阪微化石研究会杂志，特刊 11. 33-46 (1998)。

YAO AKira, EZAKI Yoichi, WANG Xinping and HAO Weicheng (eds.): "Biotic and Geologic Development of the Devonian-Triassic Paleo-Tethys in China" Peking University Press. (in press). (1999)

姚明、江崎阳一、王新平、郝伟成主编：《中国泥盆纪-三叠纪古特提斯洋的生物与地质发育》，北京大学出版社。

KUWAHARA Kiyoko, YAO Akira and AN Taixiang: "Paleozoic and Mesozoic complexes in the Yunnan area, China (Part 1) : preliminary report of Middle-Late Permian radiolarian assemblages" Journal of Geosciences, Osaka City University. Vol.40. 37-49 (1997)

桑原清子，姚明，安太祥：“中国云南地区古生代和中生代杂岩（第1部分）：中-晚二叠世放射虫组合的初步报告”，大阪市立大学地球科学学报。

Kuwahara,K.et al: "Paleozoic and Mesogoic complexes in the Yunnan area,china(part1)" Journal of Geosciences, Osaka City University. 40. 37-49 (1997)

桑原K.等：“中国云南地区古生代和中生代杂岩（第1部分）”大阪市立大学地球科学学报。