Early Ordovician reefs from the Taebaek Group, Korea: Constituents, types, and geological implications

Suk-Joo Choh, Jongsun Hong, Ning Sun, Sung Wook Kwon, Tae Yoon Park, Jusun Woo, Yi Kyun Kwon, Dong Chan Lee, Dong Jin Lee

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The Early Ordovician (early to middle Floian) bioherms of the Dumugol Formation, Korea, are compiled and their paleoenvironmental and paleogeographic implications are discussed. These reefs are mostly made up of microbialite (stromatolite and thrombolite) and lithistid sponge Archaeoscyphia, with subordinate "receptaculitid" calathids. Three types of reefs are identified based on biotic association and texture: 1) lithistid sponge-microbialite, 2) microbialite (thrombolite) with minor lithistid sponge, and 3) lithistid sponge-microbialite-calathid. The first and third type reefs are surrounded by intraclastic-skeletal packstone to grainstone and overlain by lime mudstone, whereas the second type reefs are surrounded and overlain by bioturbated wackestone and nodulebearing shale. These relationships appear to reflect varying depositional conditions during development of the reefs. The constituents of the Dumugol reefs are roughly comparable to coeval structures of Laurentia and South China with the exception of the absence of incorporated sessile organisms (i.e., Lichenaria, Pulchrilamina, and bryozoan) and delayed arrival (more than 10 myr) of calathids in the Sino-Korean Craton. This temporal disparity of biotic appearance is probably related to differential dispersal rates and patterns of sessile organisms which are largely controlled by the relative position of landmasses, epicontinental seas and major oceans. Further discovery and study of the Early Ordovician reefs from the Sino-Korean Craton will provide crucial information for understanding migration pathways of sessile organisms and paleogeographic reconstruction of the western margin of Gondwana in the Early Paleozoic.

Original languageEnglish
Pages (from-to)139-149
Number of pages11
JournalGeosciences Journal
Volume17
Issue number2
DOIs
Publication statusPublished - 2013 Jun 1

Fingerprint

Ordovician
microbialite
reef
sponge
thrombolite
craton
bioherm
stromatolite
grainstone
inland sea
bryozoan
Laurentia
Gondwana
lime
mudstone
shale
Paleozoic
texture
ocean
organism

Keywords

  • calathid
  • Early Ordovician
  • Gondwana
  • lithistid sponge
  • paleogeography
  • Sino-Korean Craton
  • South China
  • stromatolite
  • thrombolite

ASJC Scopus subject areas

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

Cite this

Early Ordovician reefs from the Taebaek Group, Korea : Constituents, types, and geological implications. / Choh, Suk-Joo; Hong, Jongsun; Sun, Ning; Kwon, Sung Wook; Park, Tae Yoon; Woo, Jusun; Kwon, Yi Kyun; Lee, Dong Chan; Lee, Dong Jin.

In: Geosciences Journal, Vol. 17, No. 2, 01.06.2013, p. 139-149.

Research output: Contribution to journalArticle

Choh, S-J, Hong, J, Sun, N, Kwon, SW, Park, TY, Woo, J, Kwon, YK, Lee, DC & Lee, DJ 2013, 'Early Ordovician reefs from the Taebaek Group, Korea: Constituents, types, and geological implications', Geosciences Journal, vol. 17, no. 2, pp. 139-149. https://doi.org/10.1007/s12303-013-0024-0
Choh, Suk-Joo ; Hong, Jongsun ; Sun, Ning ; Kwon, Sung Wook ; Park, Tae Yoon ; Woo, Jusun ; Kwon, Yi Kyun ; Lee, Dong Chan ; Lee, Dong Jin. / Early Ordovician reefs from the Taebaek Group, Korea : Constituents, types, and geological implications. In: Geosciences Journal. 2013 ; Vol. 17, No. 2. pp. 139-149.
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