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http://dx.doi.org/10.5467/JKESS.2009.30.1.033

Basaltic Andesite-Siltstone Peperite in the Gyehwari Formation (Cretaceous)  

Noh, Beyong-Seob (Department of Science Education, Chonbuk National University)
Park, Jae-Moon (Department of Science Education, Chonbuk National University)
Kim, Seung-Bum (Domestic Exploration Team, Korea National Oil Corporation)
Ryang, Woo-Hun (Division of Science Education/Institution of Fusion Science, Chonbuk National University)
Publication Information
Journal of the Korean earth science society / v.30, no.1, 2009 , pp. 33-39 More about this Journal
Abstract
This paper presents the occurrence and characteristics of the basaltic andesite-siltstone peperite in the lower part of the Gyehwari Formation (Cretaceous), Buan-gun, Jeonbuk province, SW Korea. The peperite is associated with tabular basaltic andesite body, concordantly intercalated with red siltstone and silty sandstone interbeds of floodplain facies. Development of the peperite along the upper margin of the andesite and its textural transition from a dispersed blocky type inward into a closely packed type collectively indicate an intrusive origin (?sill) of the andesite. Magma intrusion and subsequent peperite formation suggest an active syndepositional volcanism since the early stage of evolution of the Gyehwa Basin. The andesite is dated at Late Cretaceous (Santonian) by K-Ar whole-rock radiometric method.
Keywords
Gyehwari Formation; andesite-siltstone peperite; basaltic andesite;
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