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Identification of the late Quaternary tephra layers in the Ulleung Basin of the East Sea using geochemical and statistical methods by Myong-Ho Park; Ji-Hoon Kim; Young-Woo Kil is a Earth and Planetary Sciences article available to read on EtoBox.

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The late Quaternary tephra layers discovered in piston cores from the Ulleung Basin of the East Sea (Sea of Japan) were studied using X-ray fluorescence spectrometry (XRF), inductively coupled plasma atomic emission (ICP-AES) and inductively coupled plasma mass spectrometer (ICP-MS) in order to identify and differentiate the tephra layers and to characterize their major and trace element compositions. The morphology and geochemistry of glass shards, combined with 14 C dating and statistical methods, confirm the Ulleung and Aira-Tanzawa eruptions as the origin of the tephra layers, respectively. The so-called Ulleung-Oki (U-Oki; 10.1 cal. ka) and Ulleung-Yamato (U-Ym; 30.9 cal. ka) tephra layers consist predominantly of pumice-type glass shards. In contrast, the Aira-Tanzawa (AT; 23 cal. ka) tephra layer consists mainly of plane-type and/or bubble-wall glass shards. The U-Oki and U-Ym tephra layers contain K-rich glasses (R = K 2 O/SiO 2 N 0.09) ranging from phonolitic to trachytic alkali compositions, whereas the AT tephra layer which contains K-poor glasses (R = ca. 0.04) is rhyolitic. According to trace element content, the relative amounts of the elements Ti, Zr, Y, Nb and P fro

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Author

Myong-Ho Park; Ji-Hoon Kim; Young-Woo Kil

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0025-3227)

Published

2007

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)