Lower Ordovician sponge bioherms in the Makkol Formation, Taebaeksan Basin, mideast Korea

Kwon, Yongchai; Lee, Dong Jin; Choi, Duck K.; Chough, Sung Kwun

doi:10.1007/bf02667531

Cited by 26 publications

(13 citation statements)

References 29 publications

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“…The Taebaek Group is a subunit of the Joseon Supergroup consisting of 10 lithostratigraphic units (Choi, 1998;Choi and Chough, 2005). The 150-to 250-m-thick Dumugol Formation of the Taebaek Group consists of a sequence of alternating calcareous shale and limestone, which is interpreted to represent inner to outer ramp deposits (Lee and Choi, 1987;Lee and Kim, 1992;Kim and Lee, 1998;Kwon et al, 2003Kwon et al, , 2006Choi et al, 2004;Kwon and Chough, 2005). Trilobite and conodont biozones indicate that the formation is of middle Tremadocian to middle Floian (Early Ordovician) age (Kim et al, 1991;Seo et al, 1994).…”

Section: Geological Setting and Methodsmentioning

confidence: 98%

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Untangling intricate microbial–sponge frameworks: The contributions of sponges to Early Ordovician reefs

Hong

Choh

Lee

2015

Sedimentary Geology

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Section: Geological Setting and Methodsmentioning

confidence: 98%

“…The Dumugol patch reefs were initiated in shallow subtidal environments, and their growth was episodic, as evidenced by irregular erosive surfaces within reefs (Kwon et al, 2003). The erosive surfaces truncating reef constituents and micrite indicate early lithification of the reefs.…”

Section: Interpretationsmentioning

confidence: 99%

Untangling intricate microbial–sponge frameworks: The contributions of sponges to Early Ordovician reefs

Hong

Choh

Lee

2015

Sedimentary Geology

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“…By this time, the topographical relief across the Joseon Sea was extremely low, evinced by widespread distribution of hypersaline tidal flat environments in the Taebaek (Makgol Formation), Yeongwol (Yeongheung Formation), and across most of the SKC regions (Meng et al, ). The hypersaline conditions apparently inhibited colonization of stenohaline marine invertebrates, but occasional inundations of normal marine waters temporarily lowered the salinity level to support cephalopods, gastropods, and sponges (Kobayashi, ; Kwon, Lee, Choi, & Chough, ). These environments were terminated by marine transgression in the early Darriwilian (Kwon et al, ).…”

Section: Early Paleozoic Sedimentation In the Taebaeksan Basinmentioning

confidence: 99%

“…Kim & Choi, 2002;K. Kim, Choi, & Lee, 1991) and graptolites (H. Cho & Kim, 2007) Kwon, 2012;Kwon et al, 2006) lowered the salinity level to support cephalopods, gastropods, and sponges (Kobayashi, 1966;Kwon, Lee, Choi, & Chough, 2003). These environments were terminated by marine transgression in the early Darriwilian .…”

Section: During the Cambrian Series 3 In The Taebaek Area The Myobongmentioning

confidence: 99%

Evolution of the Taebaeksan Basin, Korea: I, early Paleozoic sedimentation in an epeiric sea and break‐up of the Sino‐Korean Craton from Gondwana

Choi

2018

Island Arc

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The Taebaeksan Basin is located in the mid‐eastern part of the southern Korean Peninsula and tectonically belonged to the Sino‐Korean Craton (SKC). It comprises largely the lower Paleozoic Joseon Supergroup and the upper Paleozoic Pyeongan Supergroup which are separated by a disconformity representing a 140 myr−long hiatus. This paper explores the early Paleozoic paleogeographical and tectonic evolution of the Taebaeksan Basin on the basis of updated stratigraphy, trilobite faunal assemblages, and detrital zircon U–Pb ages of the Joseon Supergroup. The Joseon Supergroup is a shallow marine siliciclastic‐carbonate succession ranging in age from the Cambrian Series 2 to Middle Ordovician. The Ongnyeobong Formation is the sole Upper Ordovician volcanic succession documented in the Taebaeksan Basin. It is suggested that in the early Paleozoic the Taebaeksan Basin was a part of an epeiric sea, the Joseon Sea, in east Gondwana. The Joseon Sea was the depositional site for lower Paleozoic successions of the SKC. Early Paleozoic sedimentation in the Joseon Sea commenced during the Cambrian Stage 3 (∼ 520 Ma) and ceased by the end of the Darriwilian (∼ 460 Ma). In the early Paleozoic, the SKC was located at the margin of east Gondwana and was separated from the South China Craton by an oceanic basin with incipient oceanic ridges, the Helan Trough. The spreading oceanic ridges and associated transform faults possibly promoted the uplift of the Joseon Sea, which resulted in cessation of sedimentation and break‐up of the SKC from core Gondwana by the end of the Ordovician.

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“…오르도비스기 초기 두무 골층에서는 미생물과 해면동물, 병광류(calathiid)가 함 께 생물초를 만든 것이 보고되었으며, 이는 오르도비 스기에 들어 후생동물이 대거 번성하기 시작하면서 미생물암이 생물초에서 차지하는 비중이 줄어드는 과 정을 반영한다 (Fig. 4B) (Lee and Choi, 1987;Kwon et al, 2003;Choh et al, 2013;Hong et al, 2014Hong et al, , 2015. 두무골층 상위의 막골층에는 조간대-조상대 환 경에서 발달하는 스트로마톨라이트와 미생물 엽층리 암(microbial laminite)이 다량 분포하며 이들은 퇴적 환경 해석에 좋은 증거가 된다 (Fig.…”

Section: 한반도의 미생물암unclassified

A Review on Microbialites: a Korean Perspective

Lee¹

2015

The Journal of the Petrological Society of Korea

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Microbialites are defined as rocks formed by microbial organisms. After their first appearance around 3.5 billion years ago, microbialites occur in various depositional environments throughout geological periods. Microbial organisms form microbialites by trapping and binding detrital sediments and/ or precipitating carbonate cements, resulting in formation of various microstructures and mesostructures. Four major types of microbialites are distinguished based on their mesostructures: stromatolite, thrombolite, dendrolite, and leiolite. In the geological records, occurrences of microbialites are influenced by calcium carbonate saturation of seawater and interaction of microbialites with metazoans. Stromatolites mainly flourished during the Precambrian, and diminished as level of atmospheric carbon dioxide declined. On the other hand, thrombolites, mainly formed by calcified microbes, began to flourish from the Neoproterozoic. As metazoans diversified in the Phanerozoic, proportion of the microbialites within sedimentary record declined. Since then, microbialites only occasionally flourished during the Phanerozoic, such as shortly after mass-extinction events. In the Korean Peninsula, microbialites occur in the Neoproterozoic Sangwon System, the Early Paleozoic Joseon Supergroup, and the Cretaceous Gyeongsang Supergroup, which form different shapes according to their age and depositional environments. By performing detailed studies on these Korean microbialites, it is possible to understand how microbes affected geological records and sedimentary environments, as well as their interaction with other organisms.

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Lower Ordovician sponge bioherms in the Makkol Formation, Taebaeksan Basin, mideast Korea

Cited by 26 publications

References 29 publications

Untangling intricate microbial–sponge frameworks: The contributions of sponges to Early Ordovician reefs

Untangling intricate microbial–sponge frameworks: The contributions of sponges to Early Ordovician reefs

Evolution of the Taebaeksan Basin, Korea: I, early Paleozoic sedimentation in an epeiric sea and break‐up of the Sino‐Korean Craton from Gondwana

A Review on Microbialites: a Korean Perspective

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