Geobiology of a lower Cambrian carbonate platform, Pedroche Formation, Ossa Morena Zone, Spain



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Creveling, Jessica R. and Fernández Remolar, David and Rodríguez Martínez, Marta and Menéndez, Silvia and Bergmann, Kristin D. and Gill, Benjamin C. and Abelson, John and Amils, Ricardo and Ehlmann, Bethany L. and García Bellido, Diego and Grotzinger, John P. and Hallmann, Christian and Stack, Kathryn M. and Knoll, Andrew H. (2013) Geobiology of a lower Cambrian carbonate platform, Pedroche Formation, Ossa Morena Zone, Spain. Palaeogeography, palaeoclimatology, palaeoecology, 386 . pp. 459-478. ISSN 0031-0182

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The Cambrian Pedroche Formation comprises a mixed siliciclastic–carbonate succession recording subtidal deposition on a marine platform. Carbonate carbon isotope chemostratigraphy confirms previous biostratigraphic assignment of the Pedroche Formation to the Atdabanian regional stage of Siberia, correlative to Cambrian Series 2. At the outcrop scale, thrombolitic facies comprise ~60% of carbonate-normalized stratigraphy and coated-grains another ~10%. Petrographic point counts reveal that skeletons contribute at most 20% to thrombolitic inter-reef and reef-flank lithologies; on average, archaeocyath clasts make up 68% of skeletal materials. In contrast, petrographic point counts show that skeletons comprise a negligible volume of biohermal and biostromal thrombolite, associated nodular carbonate facies, and ooid, oncoid and peloid grainstone facies. As such, archaeocyathan reefal bioconstructions represent a specific and limited locus of skeletal carbonate production and deposition. Consistent with data from coeval, globally dispersed lower Cambrian successions, our analysis of the Pedroche Formation supports the view that lower Cambrian carbonates have more in common with earlier, Neoproterozoic deposits than with younger carbonates dominated by skeletal production and accumulation.

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Received: 9 March 2013 / Received in revised form: 5 June 2013 / Accepted: 10 June 2013 / Available online: 22 June 2013.

Uncontrolled Keywords:Cambrian; Carbonate; Thrombolite; Skeletons; Archaeocyath
Subjects:Sciences > Geology > Stratigraphic geology
Sciences > Geology > Petrology
ID Code:72330
Deposited On:19 May 2022 07:21
Last Modified:30 May 2022 16:06

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