Studies on widespread tephras associated with Quaternary volcanism, sealevel fluctuations and climatic history in Japan

对与日本第四纪火山活动、海平面波动和气候历史相关的广泛分布的火山灰的研究

• 批准号: 59390023
• 负责人: MACHIDA Hiroshi
• 金额: $ 4.29万
• 依托单位: Tokyo Metropolitan University, Faculty of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-59390023/
• 关键词: Widespread tephra; Late Quaternary; Explosive volcanism; Age determination; The last interglacial age; Marine terrace; Tectonic movement; 深海底堆積物編年

1 In this research project eleven major volcanic ashes of the Late Quaternary age are reported in and around Japan. All of them are characterized and identified by petographic and stratigraphical methods. They are of great significance in volcanology as well as Quaternary research. The widespread vitric fine-grained ashes which originated from gigantic caldera volcanoes are all interpreted as coignimbrite ash falls. This type of tephra should be the dominant class of widespread tephra.2 Chemical composition of volcanic glass shards analysed by EPMA proved to be a powerful tool in characterization and identification of submarine volcanic ashes around the Japanese islands.3 The ages of four marker tephras occurring in central Honshu are estimated by the <^(230)Th> / <^(238)U> method based on the <^(230)Th> - <^(238)U> radioactive disequilibrium observed in the mafic minerals of the tephras.4 Determinations of marker tephras in northern Japan and southern Kyushu are favorable for correlation and identification of marine terraces of the last interglacial age, resulting in revision of the chronological framework and recognition of the tectonic nature of these regions.5 Vertical changes in oxygen isotope values of the planktonic and benthic foraminiferal tests of the two tephrochronologically dated cores from the northwestern Pacific are reported, resulting in establishment of the standard sequence of deepsea sediment chronology around Japan.

1在这项研究项目中，日本及其周围及其周围的第四纪晚期的11个主要火山灰。所有这些都以静态和地层方法来表征和识别。它们在火山学和第四纪研究中具有重要意义。源自巨大的火山火山的广泛的细颗粒灰烬都被解释为coignimbrite灰瀑布。这种类型的tephra应该是广泛的tephra的主要类别。2由EPMA分析的火山玻璃碎片的化学组成被证明是在日本岛周围的表征和鉴定在日本岛周围的海底火山灰的强大工具。 <^（230）th> - <^（238）据报道，据报道，来自西北太平洋的两个tephrochmonololologic ded核心的浮游和底栖有孔虫测试的氧同位素值据报道，从而建立了日本周围深海沉积物年代学的标准序列。

项目成果

Machida,H.: Geclogical Survey of Japan,Report. 293. 301-313 (1984)

Machida,H.：日本地质调查，报告。

Arai, F., Machida, H., Okumura, K., Miyauchi, T., Soda, T. and Yamagata, K.: "Catalog for late Quaternary marker-tephras in Japan <II> -Tephras occurring in northeastern Honshu and Hokkaido-" Geogr. Rept. Tokyo Metropol. Univ.21. 223-250 (1986)

Arai, F.、Machida, H.、Okumura, K.、Miyauchi, T.、Soda, T. 和 Yamagata, K.：“日本晚第四纪标记-火山灰目录 <II> - 发生于本州东北部和

町田洋,新井房夫,百瀬貢: 火山(第2集). 30. 49-70 (1985)

Hiroshi Machida、Fusao Arai、Mitsugu Momose：火山（第 2 卷）。 49-70 (1985)。

Chinzei,K.;Oba,T.: Recent Progress of Natural Sciences in Japan,II,Quaternary Research. 35-43 (1986)

Chinzei，K.；Oba，T.：日本自然科学的最新进展，II，第四纪研究。

町田洋,新井房夫,森脇広: "地層の知識" 東京美術, 150 (1986)

Hiroshi Machida、Fusao Arai、Hiroshi Moriwaki：“地层知识”东京美术，150（1986）