Decoding the mechanism of formation in marine ooids: A review

Diaz, Mara R.; Eberli, Gregor P.

doi:10.1016/j.earscirev.2018.12.016

Cited by 84 publications

(59 citation statements)

References 139 publications

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“…A recent review of the formation of oolites 27 confirms the intertidal and shallow subtidal formation of most of the marine oozes but emphasizes the complexity of the biogeochemical processes involved in their formation. When comparing the position of the oolites dated by 8 with the sea-level change curve (Fig.…”

Section: Discussionmentioning

confidence: 99%

Insights on the evolution of the living Great Amazon Reef System, equatorial West Atlantic

Mahiques

Siegle

Francini‐Filho

et al. 2019

Sci Rep

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The Great Amazon Reef (GARS) is an extensive mesophotic reef ecosystem between Brazil and the Caribbean. Despite being considered as one of the most important mesophotic reef ecosystems of the South Atlantic, recent criticism on the existence of a living reef in the Amazon River mouth was raised by some scientists and politicians. The region is coveted for large-scale projects for oil and gas exploration. Here, we add to the increasing knowledge about the GARS by exploring evolutionary aspects of the reef using primary and secondary information on radiocarbon dating from carbonate samples. The results obtained demonstrate that the reef is alive and growing, with living organisms inhabiting the GARS in its totality. Additional studies on net reef growth, habitat diversity, and associated biodiversity are urgently needed to help reconcile economic activities and biodiversity conservation.

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Section: Discussionmentioning

confidence: 99%

Insights on the evolution of the living Great Amazon Reef System, equatorial West Atlantic

Mahiques

Siegle

Francini‐Filho

et al. 2019

Sci Rep

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“…The microfacies of this rock sample from the lower part of the Tirgan Formation, upper Barremian, is typically a floatstone of Balkhania balkhanica MAMONTOVA and Pseudoactinoporella iranica BUCUR et al with a bioclastic-oolitic grainstone matrix. Nobody ever questioned the role of organic matter in bioclasts whereas fierce debates have taken place regarding its role in ooids (e.g., DANGEARD, 1936;O'REILLY et al, 2017;DIAZ & EBERLI, 2019, and references therein) and in microbial crusts or stromatoids sensu KALKOWSKY (1908). Microbes and mucilage (i.e., extracellular polymeric substances or EPS) were well documented in modern and fossil stromatolites and oncoids.…”

Section: Examples Of Primary Biocrystals and Replaced Biocrystalsmentioning

confidence: 99%

“…Microbes and mucilage (i.e., extracellular polymeric substances or EPS) were well documented in modern and fossil stromatolites and oncoids. On the opposite side until recently (e.g., BREHM et al, 2004;O'REILLY et al, 2017;DIAZ & EBERLI, 2019, and references therein), their role in the ooid factory was still questioned. Iranian ooids are calcitic with a radial fibrous fabric suggesting they were originally formed as highmagnesium calcite.…”

Section: Examples Of Primary Biocrystals and Replaced Biocrystalsmentioning

confidence: 99%

The biosignature of sparite permits the distinction between gravitational cement and endostromatolites

Granier¹

2020

Carnets

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Following a brief summary of some fundamentals in carbonate sedimentology (sedimentary petrography) that highlights the significance of organic matter, some examples of biocrystals in carbonate grains/particles, such as bioclasts or ooids, are provided as an introductory chapter to a discussion on gravitational cements versus endostromatolites. The gravitational cements, either marine (fibrous) or continental (dog-tooth), are made of hyaline (i.e., translucent) sparitic crystals whereas endostromatolites are made of colored sparitic crystals and/or micrite. Gravitational cements forms in the vadose zone whereas endostromatolites grow in small rock cavities in the marine phreatic zone. As such the latter can grow centripetally in all directions (not only downward).

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“…They were regarded as chiefly 'inorganic grains' in traditional view (Davies, Bubela, & Ferguson, 1978;Morse & Mackenzie, 1990), but recent studies inferred that microbes played important role in ooid construction and destruction (Summons et al, 2013;Diaz et al, 2015;Mariotti, Pruss, Summons, Newman, & Bosak, 2018). Two pathways controlling the organomineralization in ooids are biologically induced and biologically influenced mechanisms (Diaz & Eberli, 2018). Biologically influenced mechanism is passive mineralization, through which mucilaginous material or extracellular polymeric substances (EPS) control…”

Section: Introductionmentioning

confidence: 99%

The post-deposition modification of ooids by sulfate-reducing bacteria: Evidence from the Lower Jurassic in the Tethys Himalayas of southern Tibet

Chen

Yao

et al. 2020

Preprint

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Whether ooids are formed through biotic or abiotic progress seems to become increasingly controversial in recent decades. New studies indicate that the microbial effect could make important contributions to the construction, destruction and modification of ooids. Previous studies mainly focused on the organomineralization of carbonate minerals in ooids. This paper investigates the formation process of iron minerals in red oolitic grainstones of the Lower Jurassic Nieniexiongla Formation in the Tethyan Himalaya of southern Tibet. Petrographic studies and electron probe microanalysis revealed that the colorful minerals present in red ooids are hematites. Sulfur was detected in the hematites, which indicates that they were transformed from precursor pyrites. These hematites retain euhedral or framboid shapes of the pyrites. Hematite pseudomorphs distribute randomly in ooids and could not form a whole concentric layer of the ooids. Euhedral crystals usually have larger diameters than amorphous spheres and are scattered mostly in nuclei. Based on the distribution and morphology of hematites, we speculate that precursor pyrites were formed through metabolism of sulfate-reducing bacteria. Moreover, the timing of the pyrite formation was after the deposition but before the lithification. The decomposition of the microorganisms within the ooids by bacterial sulfate-reducing provides the HS-, the degradation of organic matters would produce spaces for the intrusion of pore water with sufficient Fe2+ to facilitate the pyrite deposition. In nuclei, the framboid aggregates of pyrites were transferred to euhedral crystals through continuous growth of the constituent microcrystals. Our study demonstrated organomineralization of sulfate-reducing bacteria mediated pyrites in carbonate ooids. Summary statement This paper investigates the formation process of iron minerals in red oolitic grainstones of the Lower Jurassic Nieniexiongla Formation, demonstrates organomineralization of sulfate-reducing bacteria mediated pyrites in carbonate ooids. We propose that sulfate-reducing bacteria would utilize organic matter within ooids after sedimentation, resulting changes in the mineral composition of ooids.

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Decoding the mechanism of formation in marine ooids: A review

Cited by 84 publications

References 139 publications

Insights on the evolution of the living Great Amazon Reef System, equatorial West Atlantic

Insights on the evolution of the living Great Amazon Reef System, equatorial West Atlantic

The biosignature of sparite permits the distinction between gravitational cement and endostromatolites

The post-deposition modification of ooids by sulfate-reducing bacteria: Evidence from the Lower Jurassic in the Tethys Himalayas of southern Tibet

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