Structure and Paleoecology of Lower Cambrian Reefs

Rowland, Stephen; Gangloff, Roland A.

doi:10.2307/3514525

Cited by 126 publications

(59 citation statements)

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“…Maximum skeletal abundance is similar at the three localities for which quantitative data are available (Fig. 13a), confirming previous interpretations that archaeocyath-bearing microbial reefs represent important but spatially limited loci of carbonate production (Rowland and Gangloff, 1988;Hicks and Rowland, 2009;Pruss et al, 2012). Moreover, skeletal carbonate production is partitioned amongst archaeocyath and other skeletal taxa in a consistent ratio for all three localities (Fig.…”

Section: Comparing the Nature Of Carbonate Production Within The Pedrsupporting

confidence: 86%

“…13c) is similar between these localities, with the notable exception of higher (up to 38%) archaeocyath abundance reported by Rowland and Gangloff (1988) within microbialboundstone of the Cambrian Series 2, Stage 3 lower Poleta Formation, western Nevada, USA. We note, however, that the percent archaeocyath abundance determined by Rowland and Gangloff (1988) derives from volumetric determinations via tracing methods. Results from tracing methods overestimate skeletal contribution in comparison to the grain-solid point count method employed in both this study and by Pruss et al (2012) and, therefore, cannot be directly compared to these studies.…”

Section: Comparing the Nature Of Carbonate Production Within The Pedrsupporting

confidence: 58%

“…13b) versus all other fossils (Fig. 13c) is similar between these localities, with the notable exception of higher (up to 38%) archaeocyath abundance reported by Rowland and Gangloff (1988) within microbialboundstone of the Cambrian Series 2, Stage 3 lower Poleta Formation, western Nevada, USA. We note, however, that the percent archaeocyath abundance determined by Rowland and Gangloff (1988) derives from volumetric determinations via tracing methods.…”

Section: Comparing the Nature Of Carbonate Production Within The Pedrsupporting

confidence: 56%

“…Results from tracing methods overestimate skeletal contribution in comparison to the grain-solid point count method employed in both this study and by Pruss et al (2012) and, therefore, cannot be directly compared to these studies. More generally, Debrenne (2007) has estimated that while the percent contribution of archaeocyaths to lower Cambrian bioherms can be as high as the 38% reported by Rowland and Gangloff (1988) in high energy reef crests, it is more commonly 13% or less in lower energy settings similar to those interpreted for the Pedroche Formation.…”

Section: Comparing the Nature Of Carbonate Production Within The Pedrmentioning

confidence: 95%

“…Thus, if archaeocyaths were not actively displacing other taxa from ecological niches, the evolution and expansion of the Archaeocyatha during Cambrian Series 2 likely buoyed skeletal carbonate production beyond the low diversity, low abundance observed in other places and at other times in the early Cambrian (Pruss et al, 2010). Yet, even in lower Cambrian lithologies bearing archaeocyaths, skeletons do not play the depositional role that they do later in the Paleozoic Era (Rowland and Gangloff, 1988;Hicks and Rowland, 2009;Pruss et al, 2012).…”

Section: Comparing the Nature Of Carbonate Production Within The Pedrmentioning

confidence: 99%

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

Creveling

Fernández-Remolar

Rodríguez-Martínez

et al. 2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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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 accumulatio

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Section: Comparing the Nature Of Carbonate Production Within The Pedrsupporting

confidence: 86%

Section: Comparing the Nature Of Carbonate Production Within The Pedrsupporting

confidence: 58%

Section: Comparing the Nature Of Carbonate Production Within The Pedrsupporting

confidence: 56%

Section: Comparing the Nature Of Carbonate Production Within The Pedrmentioning

confidence: 95%

Section: Comparing the Nature Of Carbonate Production Within The Pedrmentioning

confidence: 99%

See 3 more Smart Citations

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

Creveling

Fernández-Remolar

Rodríguez-Martínez

et al. 2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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Induced Calcite Precipitation by Cyanobacterium Synechococcus

Dittrich

Müller

Mavrocordatos

et al. 2003

Acta hydrochim. hydrobiol.

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This study investigated the role of the solution composition on calcite precipitation induced by cyanobacteria. The precipitation of calcium carbonate was induced by addition of cyanobacterium cells Synechococcus strain PCC 7942 in two artificial solutions with a different composition at similar saturation states in respect to calcite. Ion-selective electrodes for pH, Ca 2+ , and CO 3 2-monitored the experiments, and the morphology of precipitated crystals was analysed by scanning electron microscopy. The calcite precipitation was observed in all experiments after the addition of the cells. The composition of solution (the ratio of dissolved inorganic carbon to dissolved calcium) strongly influenced the calcite precipitation. Based on laboratory experiment results, a possible mechanism for precipitation induced by Synechococcus is proposed linking precipitation with the conditions near to cell walls rather than with the saturation conditions in the bulk solution Durch das Cyanobakterium Synechococcus induzierte CalcitfällungDie durch Zugabe von Zellen des Cyanobakteriums Synechococcus (Stamm PCC 7942) induzierte Ausfällung von Calciumcarbonat wurde an zwei ähnlich stark übersättigten wässri-gen Calcitlösungen unterschiedlicher Zusammensetzung untersucht. Während des Experiments wurden mit ionenselektiven Elektroden der pH-Wert sowie die Konzentrationen von Ca 2+ und CO 3 2-verfolgt. Außerdem wurde die Morphologie der ausgefällten Kristalle mittels Rasterelektronenmikroskopie untersucht. In allen Versuchen wurde nach Zugabe der Zellen Calcitfällung beobachtet, dabei erwies sich das Verhältnis des gelösten anorganisch gebundenen Kohlenstoffs zum gelösten Calcium als die entscheidende Einflussgröße für die Calcitfällung. Aufgrund der erhaltenen Ergebnisse wird ein Mechanismus vorgeschlagen, bei dem die induzierte Calcitfällung eher von den Verhältnissen nahe der Zellwand als vom Sättigungszustand der Lösung abhängt.

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