Early Ordovician reef construction in Anhui Province, South China: A geobiological transition from microbial- to metazoan-dominant reefs

Adachi, Natsuko; Ezaki, Yoichi; Liu, Jianbo; Cao, Jun

doi:10.1016/j.sedgeo.2009.05.012

Cited by 54 publications

(33 citation statements)

References 32 publications

(51 reference statements)

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“…In contrast, after the latest Tremadocian, the stromatolitebearing reefs declined markedly and only remained in the Dongzhi area, located on a marginal part of the platform (e.g., Li et al 2004b;Adachi et al 2009;Cao et al 2009) (Fig. 9). (2) Whereas the calcimicrobe Girvanella is common everywhere, Renalcis and Epiphyton are only found in the Dongzhi area (3) During the late Tremadocian to early Floian, the skeletal-dominated reefs, such as the lithistid sponge-bryozoan reefs, were limited to the Three Gorges area and its surroundings (e.g., Zhu et al 2006;Adachi et al 2011); however, the skeletal reefbuilders, such as the lithistid sponges, receptaculitids and bryozoans, expanded their habitats from the Three Gorges area, located in a central part of the platform, to the Dongzhi and Tongzi areas, forming the lithistid spongecalcimicrobial reefs (e.g., Adachi et al 2009;Cao et al 2009) (Fig. 9).…”

Section: Bryozoan-pelmatozoan Reefsmentioning

confidence: 99%

“…6). These various degrees of preservation are inferred to reflect the effects of bacterial decay of the sponge soft tissue and their concurrent calcification (e.g., Adachi et al 2009Adachi et al , 2012.…”

Section: Lithistid Spongesmentioning

confidence: 99%

“…For example, stromatolite reefs have been reported from the Shitai area of Anhui Province, and lithistid sponge-stromatolite reefs from the Dongzhi area of Anhui Province (Li et al 2004b;Adachi et al 2009;Cao et al 2009). Several other reef communities have been recognized (e.g., sponge Archaeosphia, receptaculitid Calathium-Archaeosphia, Calathium-cyanobacteria, bryozoan Batostoma, and pelmatozoan-Batostoma communities) based on field observations at the Huanghuachang section of the Three Gorges area, Hubei Province (Zhu et al 1995(Zhu et al , 2006.…”

Section: Introductionmentioning

confidence: 99%

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Early Ordovician reefs in South China (Chenjiahe section, Hubei Province): deciphering the early evolution of skeletal-dominated reefs

Adachi¹

2012

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The Lower Ordovician (late Tremadocianearly Floian) Fenhsiang and the overlying Hunghuayuan Formations at the Chenjiahe section in the Three Gorges area of Hubei Province, South China, include four types of reef: microbe-dominated (lithistid sponge-stromatolite and lithistid sponge-calcimicrobial) reefs, and skeletal-dominated (lithistid sponge-bryozoan and bryozoan-pelmatozoan) reefs. The microbe-dominated reefs are characterized by the dominance of microbial sediments that encrusted and bound the surfaces of sponges to reinforce the reef frameworks. In contrast, the skeletal-dominated reefs are distinguished by bryozoans that encrusted frame-building sponges and pelmatozoans, and that grew downward to fill the open spaces available within the frameworks. A series of these reefs shows a temporal succession in reef type, with a decline in the lithistid sponge-stromatolite reefs and an increase in the lithistid sponges and receptaculitids within the lithistid sponge-calcimicrobial reefs in the Hunghuayuan Formation; the lithistid sponge-bryozoan reefs are common in both the Fenhsiang and HunghuayuanFormations. These features of the Chenjiahe reefs are in marked contrast to other coeval reefs on the Yangtze Platform and elsewhere. Skeletal-dominated reefs first developed in the Three Gorges and adjacent areas, located on the central part of the platform. Likewise, lithistid sponges and receptaculitids first developed in the Three Gorges area and then expanded their range. In contrast, stromatolites declined over time, but remained abundant on a marginal part of the platform. The spatial-temporal distributions of these reefs on the Yangtze Platform reflect the initiation of the Great Ordovician Biodiversification Event and its consequences, although influenced by local environmental conditions. The Three Gorges area was a center for the development of skeletal-dominated reefs, which were established earlier here than elsewhere in the world. These reef types and their spatial-temporal successions provide invaluable clues to the earliest evolution of skeletal-dominated reefs and their ensuing development during the Middle-Late Ordovician.

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Section: Bryozoan-pelmatozoan Reefsmentioning

confidence: 99%

Section: Lithistid Spongesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early Ordovician reefs in South China (Chenjiahe section, Hubei Province): deciphering the early evolution of skeletal-dominated reefs

Adachi¹

2012

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“…These were generally thriving in the Early Ordovician, but declined somewhat from the Middle Ordovician. Reefs dominated by stromatolites and thrombolites are represented by the Nantsinkuan Formation, Songzi, Hubei [18], the Lunshan Formation, Shitai [16], and the Hunghuayuan Formation, Dongzhi, southern Anhui [25,47]. Green algae and red algae with calcified cytoderms could baffle and bind particles, and their lithological proportions rose steadily from the Darriwilian period [15].…”

Section: Succession Of the Reef-building Taxamentioning

confidence: 99%

Types and biotic successions of Ordovician reefs in China

et al. 2012

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“…Although the development of Early Ordovician reefs has been largely attributed to microbial binding and building processes (Cañas and Carerra, 1993;Webby, 2002;Adachi et al, 2009Adachi et al, , 2013, some reports have demonstrated that Early Ordovician skeletal frameworks built by skeletal organisms also constituted parts of the reefs (Toomey and Nitecki, 1979;Pratt and James, 1982;Adachi et al, 2011;Cuffey et al, 2013;Li et al, 2014). In this study, we document sponge frameworks in typical Early Ordovician microbial-sponge reefs from Korea, and assess the sedimentological and paleoecological functions of the sponges based on detailed petrographic descriptions.…”

Section: Introductionmentioning

confidence: 95%

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

Hong

Choh

Lee

2015

Sedimentary Geology

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Early Ordovician reef construction in Anhui Province, South China: A geobiological transition from microbial- to metazoan-dominant reefs

Cited by 54 publications

References 32 publications

Early Ordovician reefs in South China (Chenjiahe section, Hubei Province): deciphering the early evolution of skeletal-dominated reefs

Early Ordovician reefs in South China (Chenjiahe section, Hubei Province): deciphering the early evolution of skeletal-dominated reefs

Types and biotic successions of Ordovician reefs in China

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

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