Petrographic characteristics in the pumice clast deposited along the Gulf of Thailand, drifted from Fukutoku-Oka-no-Ba

Kenta Yoshida; Yoshihiko Tamura; Tomoki Sato; Chalermrat Sangmanee; Ratchanee Puttapreecha; Shigeaki Ono

doi:10.2343/geochemj.GJ22011

This article has now been updated. Please use the final version.

Petrographic characteristics in the pumice clast deposited along the Gulf of Thailand, drifted from Fukutoku-Oka-no-Ba

Kenta Yoshida , Yoshihiko Tamura, Tomoki Sato, Chalermrat Sangmanee, Ratchanee Puttapreecha, Shigeaki Ono

Author information

Kenta Yoshida Corresponding author
https://orcid.org/0000-0001-9525-1598
Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology (JAMSTEC). 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
Yoshihiko Tamura
https://orcid.org/0000-0002-3705-7815
Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology (JAMSTEC). 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
Tomoki Sato
https://orcid.org/0000-0002-0076-0531
Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology (JAMSTEC). 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
Chalermrat Sangmanee
https://orcid.org/0000-0003-3664-5751
Thailand Department of Marine and Coastal Resources, 120 Moo 3, Ratthaprasasanabhakti Building, 5-9th Floor, Chaeng Watthana Road, Thung Song Hong, Khet Lak Si, Bangkok, 10210 Thailand
Ratchanee Puttapreecha
Thailand Department of Marine and Coastal Resources, 120 Moo 3, Ratthaprasasanabhakti Building, 5-9th Floor, Chaeng Watthana Road, Thung Song Hong, Khet Lak Si, Bangkok, 10210 Thailand
Shigeaki Ono
https://orcid.org/0000-0003-1880-7569
Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology (JAMSTEC). 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan

Keywords: pumice rafts, Fukutoku-Oka-no-Ba, Izu-Ogasawara arc, Gulf of Thailand, South China Sea

JOURNAL OPEN ACCESS Advance online publication
Supplementary material

Article ID: GJ22011

DOI https://doi.org/10.2343/geochemj.GJ22011

The final version of this article is now available: Vol. 56 (2022), No. 5

Details

Abstract

The 2021 eruption of Fukutoku-Oka-no-Ba (FOB) in the northwest Pacific on 13 August 2021 produced a large volume of pumice that drifted westward for ~1300 km to the Nansei Islands, Japan, and some extent. In February 2022, pumice with similar characteristics to the FOB pumice was deposited along the Gulf of Thailand. The pumice clasts deposited in Songkhla Province, Thailand, were fine-grained with <4 cm in size and rounded. Most of the clasts consisted of clinopyroxene, plagioclase (andesine), and olivine phenocrysts in a vesiculated grey groundmass, with black-coloured spots exhibiting signatures of a basaltic magma. The whole-rock compositions of the pumice are trachytic, with 61 mass% SiO₂ and 9 mass% total alkali (Na₂O + K₂O). The overall characteristics in the pumice from Thailand are similar to those in FOB pumice. These pumice in Thailand were from the 2021 FOB eruption, and drifted >2800 km south-westward across the South China Sea.

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