This is a Preprint and has not been peer reviewed.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.
Petrographic characteristics in the pumice clast deposited along the Gulf of Thailand, drifted from Fukutoku-Oka-no-Ba
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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 18:55
Last Updated: 2022-06-17 17:42
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