3 years ago

Re-identification of Shishimuta-Pink tephra samples from the Japanese Islands based on simultaneous major- and trace-element analyses of volcanic glasses

The Shishimuta-Pink (Ss-Pnk) tephra erupted from the Shishimuta caldera on Kyushu Island, Japan, at 1 Ma, and it is distributed extensively over the Japanese Islands. We quantitatively analyzed 58 elements in volcanic glass shards of this tephra, which sampled at 9 points, using laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS). The nine samples have been correlated as Ss-Pnk tephra in previous studies, based on various geologic and petrographic properties. The element patterns of the tephra samples are similar, except for that of the Kuratama–Rindo O7 sample obtained in the Kazusa Group at the Boso Peninsula, located ∼900 km from the source volcano. The results of the Tukey–Kramer multiple comparison test suggest that 62%–71% of the concentrations of the 58 elements in the Kuratama–Rindo O7 sample differ significantly from the element concentrations in the other eight Ss-Pnk samples, whereas only 2%–31% of the element concentrations of the eight Ss-Pnk samples vary significantly. The element pattern of the sample of the Osaka Group Pink (OGPK), which is treated as being representative of the Ss-Pnk tephra, can be clearly distinguished from five other widespread marker tephras erupted from Kyushu Island. These results strongly suggest that the multi-element analysis of volcanic glass shards from tephras can be used as a basis for the identification and correlation of widespread Quaternary tephras.

Publisher URL: www.sciencedirect.com/science

DOI: S1040618216310497

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