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

Jin Han Ree; Suk Joo Choh; Haemyeong Jung; Dong Jin Lee

doi:10.1007/s12303-016-0023-z

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

Jin Han Ree, Suk Joo Choh, Haemyeong Jung, Dong Jin Lee

Department of Earth and Environmental Sciences

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	285-294
Number of pages	10
Journal	Geosciences Journal
Volume	20
Issue number	3
DOIs	https://doi.org/10.1007/s12303-016-0023-z
Publication status	Published - 2016 Jun 1

Keywords

Archaeocyath
Hyangsanni Formation
Okcheon Basin
deformation
microfabrics

ASJC Scopus subject areas

Environmental Science(all)
Earth and Planetary Sciences(all)

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title = "Re-examination of a supposed {\textquoteleft}archaeocyath{\textquoteright} specimen from the Hyangsanni Formation, Okcheon Basin, Korea",

abstract = "A supposed {\textquoteleft}archaeocyath{\textquoteright} 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.",

keywords = "Archaeocyath, Hyangsanni Formation, Okcheon Basin, deformation, microfabrics",

author = "Ree, {Jin Han} and Choh, {Suk Joo} and Haemyeong Jung and Lee, {Dong Jin}",

note = "Publisher Copyright: {\textcopyright} 2016, The Association of Korean Geoscience Societies and Springer-Verlag Berlin Heidelberg.",

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doi = "10.1007/s12303-016-0023-z",

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T1 - Re-examination of a supposed ‘archaeocyath’ specimen from the Hyangsanni Formation, Okcheon Basin, Korea

AU - Ree, Jin Han

AU - Choh, Suk Joo

AU - Jung, Haemyeong

AU - Lee, Dong Jin

PY - 2016/6/1

Y1 - 2016/6/1

N2 - 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.

AB - 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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KW - Hyangsanni Formation

KW - Okcheon Basin

KW - deformation

KW - microfabrics

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SP - 285

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ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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