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- W757882904 abstract "The goal of this study is to investigate the subsurface stratigraphy of Cheju volcanic island by analysing core data. The subsurface stratigraphy of the island is as as follows: The basement rock is Cretaceous granites and tuff, which are overlain successively by Sehwari Formation, Basal basalt (APB, OAB, FOB), Seogwipo Formation and basalt (FOB, Hawaiite and so on). The depth of granite basement ranges from 320 m to 950 m below sea level and the paleo-geomorphic relief of the island in the granite shows high difference level such as about 630 m in altitute. The depth of basal tuff ranges from 117 m to 227 m below the mean sea level. The thickness of the tuff ranges from 41 m to 773 m, and the paleo-geomorphic relief is even more than that of granite basement. The Sehwari Formation is composed of the unconsolidate silty clays and sands, containing shell fossils. The depth of this formation is from +30 m to -245 m and distributed along the coastal area. The basal basalt is consisted of aphanic basalt (APB), olivine augite basalt (OAB) and feldspar olivine basalt (FOB). The age of basal basalt shows a range from 2.22 Ma to 0.7 Ma. The Segwipo Formation, which is distributed along the coastal area, is composed of beach sediments containing several kinds of shell fossils. The age of the formation is estimated from 0.7 Ma to 0.4 Ma." @default.
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- W757882904 date "1998-01-01" @default.
- W757882904 modified "2023-09-24" @default.
- W757882904 title "The Subsurface Stratigraphy of Cheju Volcanic Island, Korea" @default.
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