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Reconstruction of the lower Miocene depositional environment in Honshu, Japan

日本本州下中新世沉积环境重建

基本信息

批准号：
11640461
负责人：
OGASAWARA Kenshiro
金额：
$ 2.24万
依托单位：
Institute of Geoscience, University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640461/
关键词：
lower Miocene sequence stratigraphy Sr isotope stratigraphy depositional environment Joban coal-field fauna and flora Pacific gateway paleo-climatical succession Pacific gateways 本州秩父盆地古気候古海中気候堆積環境

项目摘要

During this academic year (2000-2001), we studied lower Miocene stratigraphy in Honshu main land form a veiw point of sequence stratigraphy and collected fossils from these strata. We also studied the Sr isotope stratigraphy using molluscan shells collected from these lower Miocene strata. The studied areas includes Echizen costal area and the Fukui City area. Fukui Prefecture. Hota-Mincoka area. Boso Peninsula. Saku-Uchiyama area of Nagano and Gumma Prefectures, Shimonita area of Gumma Prefecture, Chichibu Basin of Saitama Prefecture, Joban coal-field, Fukushima Prefecture and marumori Basin of Miyagi Prefecture. In addition, we Studied lower Miocene of the Iriomote-jima Island, Okinawa Prefecture to understand these floral changes.As a result, we have established the lower Miocene standard section in the Joban coal-field. It covered from 22 Ma to 15 Ma and included two-time warming and cooling events. In general, we obtained successful results of the Sr isotope stratigraphy using mollusean shells. In addition, we also studied lower Miocene from sedimentological view as exemplified by the lower Miocene of the Boso Peninsula using heavry-minerals such as detrital chromian spinel to understand tectonic setting during the early Miocene of the Japanese Islands.Based on these result, we would like to continue the study concerned this project in future by expanding to view from the Pacific gateways and also include Sr isopote stratigraphy of the adjacent area such as Taiwan, Korea, Sakhalin, Kamchatska and so on to clarify lower Miocene paleoenvironments for more wider global scope.

本学年（2000-2001），我们从层序地层学的角度对本州大陆下中新统地层进行了研究，并采集了化石。我们还研究了Sr同位素地层学使用的软体动物贝壳收集这些下中新世地层。研究区域包括越前沿海地区和福井市地区。福井县。Hota-Mincoka地区。房总半岛。长野县和群马县的佐久内山地区，群马县的下田地区，琦玉县的秩父盆地，福岛县的常板煤田和宫城县的丸森盆地。此外，我们还对冲绳县西表岛早中新世进行了研究，以了解这些植物群的变化。因此，我们建立了常板煤田早中新世标准剖面。它的时间跨度为22 ~ 15 Ma，包括两次升温和降温事件。总的来说，我们用软体动物壳进行锶同位素地层学研究取得了成功的结果。此外，我们还从沉积学的角度研究了早中新世，以房总半岛早中新世为例，利用碎屑铬尖晶石等重矿物来了解日本群岛早中新世的构造背景。我们希望在未来继续进行有关该项目的研究，扩大到从太平洋网关的观点，也包括Sr等电位地层学的研究。邻近地区如台湾、韩国、库页岛、堪察加半岛等，以澄清更广泛的全球范围内的下中新世古环境。