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Distribution of late Quaternaty tephra layers in the western part of the Ulleung Basin,East Sea
Myong-HoPark,Il-Soo Kim,Byong-JaeRyu 한국지질과학협의회 2003 Geosciences Journal Vol.7 No.2
Lithologies and stratigraphic relationships of lateQuaternary core sediments were examined in three piston cores,recovered from the western Ulleung Basin. The approximately 8-m long cores consist of muddy sediments that are interbedded withlapili and ash layers. The morphological and major element com-positional studies suggest that volcanic glas shards of the tephralayers are equivalent to those of fallout deposits of the Ulleung -Oki(ca. 9.3 ka), Aira-Tanzawa (ca. 22-24.3 ka), and Uleung-Yamato(ca. 25-33 ka). The ocurrence of the lapilli layers in the westernUleung Basin implies that the known falout distribution of pumice-type glass shards can be extended about 50 to 100 km to the west.