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http://dx.doi.org/10.5467/JKESS.2021.42.1.55

Occurrence and Identification of Tephra Layers found in the Ulsan area, Southeastern Korea  

Kim, Cheong-Bin (Department of Phycics Education, Sunchon National University)
Kim, Young-Seog (Department of Earth & Environment Sciences, Pukyong National University)
Lim, Hyoun Soo (Department of Geological Sciences, Pusan National University)
Publication Information
Journal of the Korean earth science society / v.42, no.1, 2021 , pp. 55-64 More about this Journal
Abstract
Tephrochronology is the study of tephra layers to correlate and date geologic events. As tephra layers can be used as time-markers, they are essential for the dating of Quaternary deposits. In this study, two types of tephra layers were found in the upper and lower parts of marine terrace deposits distributed in the Sanha-dong and Jeongja-dong, Ulsan areas. Based on the morphological features of glass shards, refractive indices, major element compositions, and similarity coefficients, the upper and lower tephras were identified as AT (ca. 25 ka) and Ata (ca. 105-110 ka) tephra, respectively. To the best of our knowledge, this is the first official report of Ata tephra on terrestrial deposits in Korea. These results are expected to aidin the research of the Quaternary paleoclimate, paleoenvironment, and active faults in the southeastern part of Korea.
Keywords
Ata tephra; AT tephra; marine terrace; refractive index; similarity coefficient;
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