Widespread submarine tephras around Japan — Petrographic and chemical properties

Toshio Furuta, Kantaro Fujioka, Fusao Arai

doi:10.1016/0025-3227(86)90103-9

Widespread submarine tephras around Japan — Petrographic and chemical properties

DOI Web Site Web Site 被引用文献36件

書誌事項

公開日: 1986-06

権利情報

https://www.elsevier.com/tdm/userlicense/1.0/

DOI

10.1016/0025-3227(86)90103-9

公開者: Elsevier BV

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説明

Abstract In deep-sea sediments around the Japanese Islands, tephra layers are frequently recognized, and some tephras can be identified by petrographic and chemical features and correlated to source volcanoes of both Japan and Korea. Most tephras distributed over more than several hundred kilometers from the source volcanoes were presumably carried away by the dominant westerly wind. Six characteristic marker tephras in deep-sea sediments can be identified and correlated according to their distribution and grain size, petrography, and chemistry. They play an important role in compiling the Late Quaternary chronology of the deep-sea sediments distributed around the Japanese Islands. Petrographic and geochemical studies reveal that the refractive index of volcanic glass shards in tephras is controlled by the amount of total transition metal oxides rather than the amount of SiO 2 . We propose a new equation relating refractive index to glass shard chemistry.