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

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.2343/geochemj.GJ22011. This is version 3 of this Preprint.

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Authors

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

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 along the Gulf of Thailand. The pumice clasts deposited in Songkhla Province, Thailand, were <4 cm in length 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.

DOI

https://doi.org/10.31223/X5PP9X

Subjects

Earth Sciences

Keywords

pumice rafts, Fukutoku-Oka-no-Ba, Izu-Ogasawara arc, pumice raft, Fukutoku-Oka-no-Ba, Izu-Ogasawara arc

Dates

Published: 2022-04-21 22:25

Last Updated: 2022-06-17 21:12

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License

CC BY Attribution 4.0 International