Microbes and Ooids

Duguid, Sarah; Kyser, T. Kurtis; James, Noël P.; Rankey, Eugene C.

doi:10.2110/jsr.2010.027

Cited by 120 publications

(126 citation statements)

References 38 publications

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“…Radiocarbon dating of modern marine ooids suggests that typical ooid lifetimes (τooid) are ≤ 2000 yr (Beaupré et al, 2015;Duguid et al, 2010), so this is a relevant timescale to compare with the predicted time to reach an equilibrium size (teq). For this exercise, we assume a spherical cortex with a diameter of 50 µm and calculate the expected time for this nucleus to reach a diameter of 500 µm, chosen both because this is a common ooid size in modern environments and the rock record (and therefore a likely possible choice for Deq in typical ooidforming environments) and because Deq of this size can be achieved using many reasonable parameter combinations (Fig.…”

Section: Text S4 Ooid Lifetimes and Equilibrium Timescalesmentioning

confidence: 99%

Experimental evidence that ooid size reflects a dynamic equilibrium between rapid precipitation and abrasion rates

Trower

Lamb

Fischer

2017

Earth and Planetary Science Letters

140

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Section: Text S4 Ooid Lifetimes and Equilibrium Timescalesmentioning

confidence: 99%

Experimental evidence that ooid size reflects a dynamic equilibrium between rapid precipitation and abrasion rates

Trower

Lamb

Fischer

2017

Earth and Planetary Science Letters

140

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“…Previous measurements have demonstrated that 14 C ages of ooids decrease radially from their nuclei toward their outer surfaces. However, those pioneering studies were performed prior to the onset of modern radiocarbon dating conventions (Martin and Ginsburg, 1965), did not present sufficient methodological detail for replication (James et al, 2004), or were based on coarse radial resolution (Duguid et al, 2010;Hearty et al, 2010;James et al, 2004;Yokoyama et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Rapid, high-resolution 14C chronology of ooids

Beaupré

Roberts

Burton

et al. 2015

Geochimica et Cosmochimica Acta

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“…There is evidence that microbial processes are actively involved at various stages in their mineralization (BREHM et al, 2004;EDGCOMB et al, 2013;DIAZ et al, 2013DIAZ et al, , 2014DIAZ et al, , 2015O'REILLY et al, 2016). For instance, some microbes may promote mineralization of ooids that takes place in extracellular polymeric substances (EPS) whereas others may alter the original mineralization of ooid cortices (DUGUID et al, 2010). A parallel may be drawn with the mineralization of the "calcareous" green algae that also takes place within an extracellular mucilage.…”

Section: Testing Hardie's (1996) Modelmentioning

confidence: 99%

Comments on "Estimating the impact of early diagenesis on isotope records in shallow-marine carbonates: A case study from the Urgonian platform in western Swiss Jura" by A. Godet et al. [Palaeogeography Palaeoclimatology Palaeoecology 454 (2016) 125-138]

Granier¹,

Clavel²,

Charollais³

2016

Carnets Geol.

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Highlights• In this study we reiterate that there is a reliable alternative, well-documented bio-and sequencestratigraphic model in addition to the one used by GODET et al.• Application of our model leads to different conclusions concerning stratal correlations.• We question the sequence and timing of diagenetic events presented by GODET et al.• We elaborate on the dissolution of calcitic ooid cortices.• We discuss SANDBERG's and HARDIE's models of calcite and aragonite seas. Abstract:A recent paper by GODET et al. on Urgonian carbonates from the Swiss Jura concluded that diagenesis may hinder chemostratigraphic correlations of deep-to shallow-water facies. Although we agree with this conclusion we question their arguments and interpretations. These authors correctly identified diagenesis as the key factor, but we question the timing of events in their paragenetic sequence. In particular, they reported the leaching of originally calcitic oolitic cortices but failed to discuss this puzzling feature properly. In addition, the backbone of their argument is the stratigraphic correlation of a specific sequence from three dominantly shallow-water sections together with a basinal reference section. However, a reliable alternative biostratigraphic framework shows that this attempt of long-distance correlation might be erroneous. -Une publication récente de GODET et al. sur les carbonates urgoniens du Jura suisse concluait que la diagenèse pouvait compromettre les corrélations chimiostratigraphiques des faciès distaux vers les proximaux. Bien que nous soyons d'accord avec cette conclusion, nous nous interrogeons sur les arguments des auteurs et leurs interprétations. Ils ont bien identifié la diagénèse comme étant le facteur déterminant, mais nous mettons en doute la chronologie des événements de leur séquence paragénétique. Ils ont notamment signalé la dissolution de cortex d'ooïdes originellement calcitiques mais n'ont pas abordé sous un bon angle cet élément étonnant. De plus, leur argumentaire s'appuie sur la corrélation stratigraphique d'une séquence spécifique identifiée dans trois coupes aux faciès Key Words

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Microbes and Ooids

Cited by 120 publications

References 38 publications

Experimental evidence that ooid size reflects a dynamic equilibrium between rapid precipitation and abrasion rates

Experimental evidence that ooid size reflects a dynamic equilibrium between rapid precipitation and abrasion rates

Rapid, high-resolution 14C chronology of ooids

Comments on "Estimating the impact of early diagenesis on isotope records in shallow-marine carbonates: A case study from the Urgonian platform in western Swiss Jura" by A. Godet et al. [Palaeogeography Palaeoclimatology Palaeoecology 454 (2016) 125-138]

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