Re-examination of a supposed ‘archaeocyath’ specimen from the Hyangsanni Formation, Okcheon Basin, Korea

A supposed ‘archaeocyath’ specimen from the Hyangsanni Formation of the Okcheon Basin (Okcheon Metamorphic Belt), Korea, reported about 50 years ago, has previously been used to constrain the depositional age of the metasedimentary succession in the basin. However, a re-examination of the specimen r...

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Published inGeosciences journal (Seoul, Korea) Vol. 20; no. 3; pp. 285 - 294
Main Authors Ree, Jin-Han, Choh, Suk-Joo, Jung, Haemyeong, Lee, Dong-Jin
Format Journal Article
LanguageEnglish
Published Seoul The Geological Society of Korea 01.06.2016
Springer Nature B.V
한국지질과학협의회
Subjects
Age
Basins
Belts
Deformation mechanisms
Earth and Environmental Science
Earth Sciences
Formations
Geology
Metamorphic
Microstructure
Morphology
Radioactive age determination
Sediments
지질학
South Korea
Archaeocyath
deformation
Okcheon Basin
microfabrics
Hyangsanni Formation
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Summary:A supposed ‘archaeocyath’ specimen from the Hyangsanni Formation of the Okcheon Basin (Okcheon Metamorphic Belt), Korea, reported about 50 years ago, has previously been used to constrain the depositional age of the metasedimentary succession in the basin. However, a re-examination of the specimen reveals that it lacks the typical morphology of archaeocyaths. A detailed petrographic and microfabric analysis of the specimen, combined with a review of outcrop structures and microstructures of the dolomitic marble in the Hyangsanni Formation indicates that the supposed archaeocyath- like shape of the specimen was caused by deformations and metamorphic reactions. The Cambrian age of the Hyangsanni Formation should therefore be re-examined on the basis of unequivocal palaeontological evidence and/or radiometric dating.
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G704-000565.2016.20.3.001
ISSN:1226-4806
1598-7477
DOI:10.1007/s12303-016-0023-z