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Metazoan-microbial framework fabrics in a Mississippian (Carboniferous) coral-sponge-microbial reef, Monto, Queensland, Australia
Shen, JW; Webb, GE;
AbstractMicrobial fabrics (stromatolites, thrombolites and calcimicrobes) occur in many Paleozoic carbonate buildups and commonly dominated reefs after mass extinction events (e.g., Middle Cambrian, Famennian [Late Devonian] and early Mississippian). By Visean (middle Mississippian) time, eastern Australian reefs were mostly small, microbialite-dominated structures, but they contained diverse reef-building metazoans (e.g., rugose and tabulate corals, bryozoans) that came to dominate limited reef facies in some cases. Reefs in the Cannindah Limestone at Old Cannindah Homestead, Monto region, Queensland are exceptional in being the largest such reefs and in having the most complex and differentiated reef facies. They occurred on an oolitic-crinoidal bank characterized by long-tenn continuous carbonate deposition in a shallow, high-energy setting. Cannindah reef framework contained lithistid sponges and diverse corals, but was dominated by microbialite. The microbialites contain diverse thrombolites, microdigitate stromatolites, and calcimicrobes. Abundant syndepositional cavities in the microbial framework supported a diverse cryptic fauna including numerous calcimicrobes (e.g., Renalcis, Palaeomicrocodium, Girvanella, Ortonella, Aphralysia, and problematica), crinoids, and ostracodes. Cavities indicate that the framework was suprastratal both where microbialite-dominated and where skeletal organisms played a role in framework construction. Although these reefs grew following Late Devonian extinction events that affected skeletal reef builders, the dominance of microbialites is difficult to attribute to the absence of appropriate skeletal reef builders. The reefs occurred similar to 20 million years after the Devonian-Mississippian transition, and diverse, potentially reef-building corals and algae occur throughout the reefs, but never rose to dominate framework construction. High siliciclastic flux, turbidity, abnormal salinity, low oxygen levels, low light penetration, and climatic deterioration can be eliminated as limiting factors for skeletal organisms in the reefs suggesting either that: 1) subtle nutrient or ecological factors governed the community membership; or 2) that the microbial biofilms competed well for reef substrate. (c) 2005 Elsevier B.V. All rights reserved.
DepartmentChinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510301, Peoples R China; Univ Queensland, Sch Nat Resource Sci, Brisbane, Qld 4001, Australia
KeywordMicrobialite Reefs Mississippian Eastern Australia Cryptic Microbes Calcimicrobes
Subject AreaGeology
Indexed Bysci
Funding Project海洋地质
WOS IDWOS:000230584900006
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Shen, JW,Webb, GE, Metazoan-microbial framework fabrics in a Mississippian (Carboniferous) coral-sponge-microbial reef, Monto, Queensland, Australia[J]. SEDIMENTARY GEOLOGY,2005,178(40545):113-133.
APA Shen, JW,Webb, GE,& framework fabrics in a Mississippian (Carboniferous) coral-sponge-microbial reef, Monto, Queensland, Australia.SEDIMENTARY GEOLOGY,178(40545),113-133.
MLA Shen, JW,et al."Metazoan-microbial framework fabrics in a Mississippian (Carboniferous) coral-sponge-microbial reef, Monto, Queensland, Australia".SEDIMENTARY GEOLOGY 178.40545(2005):113-133.
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