No.105 研究課題 / Project
多摩川中流域に分布する上総層群の古環境と氷河性海水準変動の教材化Preparation of teaching materials on old environment and glacial eustacy of the Kazusa Group in the middle reaches of the Tama River| 一般研究 General Research |
No.105 |
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| 代表研究者 Principal Investigator |
藤井 英一 eiichi fujii |
| 所属（採択当時） Affiliation |
東京都立晴海総合学科高校教諭 Tokyo Metropolitan Harumi Sogo High School |
| 研究内容要約 Research Summary |
多摩川中流域（多摩川中流とその支流域）に広がる第四紀更新世の上総層群には、７つの堆積サイクルが認められる。さらに、７つの堆積サイクルは、それぞれ１～４のユニットに区分される。また、調査地域の上総層群より１４の貝化石群集を認定した。これらの貝化石群集より、本調査地域は、現在の本調査地域に最も近い沿岸地域（千薬県銚子沿岸）の年平均表面海水温に比較し、古水温が低かった時期や高かった時期があったことが明らかになった。これらは氷河性海水準変動と密接な関係があると考えられる。 以上のことをもとに「多摩川中流域の古環境及びその変遷、それらと氷河性海水準変動の関係」を明らかにするための野外実習を含む教材化を行った。 In the middle reaches of the Tama River (including the middle Tama River and the reaches of its tributaries) lies the Kazusa Group, which was formed in the Pleistocene Epoch of the Quaternary Period. It is characterized by 7 sedimentary cycles, each of which is further classified into 1-4 unit(s). Fourteen mollusk fossil assemblages were found at survey sites. As a result of analysis of these fossils, it was determined that there were periods when water temperature was lower or higher in the survey sites than the present average annual sea surface temperature in the coastal area (in Choshi City of Chiba Prefecture) that is closest to the survey sites. This phenomenon appears to have had a close relationship with glacial eustacy (sea level change). Based on the above, we prepared an educational activity including fieldwork, in order to understand the old environment in the middle reaches of the Tama River and its changes, as well as the relationship between such changes and glacial eustacy. |
| 共同研究者 Collaborators |
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| 研究全文 Full Text |
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