Distribution of sulphur and magnesium in the red coral

Vielzeuf, Daniel; Garrabou, Joaquim; Gagnon, Alex; Ricolleau, A.; Adkins, Jess F.; Günther, Detlef; Hametner, Kathrin; Devidal, Jean‐Luc; Reusser, Éric; Perrin, Jonathan; Floquet, N.

doi:10.1016/j.chemgeo.2013.07.008

Cited by 50 publications

(71 citation statements)

References 46 publications

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“…From these observations, it can be concluded that the addition of more or less continuous layers of crystallites of Mg-calcite of slightly variable compositions (12 ± 2 mol% MgCO 3 ; Vielzeuf et al 2013) is the predominant mechanism of annular growth in the sub-apical part of the skeleton. However, sclerites play also a minor role in the radial growth.…”

Section: Discussionmentioning

confidence: 93%

“…700/mm 2 ; Grillo et al 1993). Inside the skeleton, the growth rings of the annular domain are marked by variations of color (Lacaze-Duthiers, 1864), concentration of organic matrix (Marschal et al 2004) and variations of magnesium and sulfur contents (Vielzeuf et al 2008(Vielzeuf et al , 2013). An annual periodicity of the growth rings has been demonstrated for the organic matrix rings (Marschal et al 2004) and for the magnesium and sulfur rings (Vielzeuf et al 2008).…”

Section: Resultsmentioning

confidence: 99%

“…As noted earlier, the annular domain of C. rubrum is characterized by the presence of concentric growth rings parallel to the skeleton growth surface. Variations of calcium, magnesium, sulfur, strontium, and organic matrix point out the addition of rings of variable compositions with time (Marschal et al 2004;Vielzeuf et al 2013;Weinbauer 2000). The tortuous interfaces between the rings result from the presence of microprotuberances at the surface of the red coral skeleton and can be seen as paleosurfaces of growth.…”

Section: Discussionmentioning

confidence: 97%

“…The tortuous interfaces between the rings result from the presence of microprotuberances at the surface of the red coral skeleton and can be seen as paleosurfaces of growth. At large scale, the relatively homogeneous chemical layers can be recognized over long distances and allow the counting of annual growth rings (Vielzeuf et al 2013). However, chemical images at higher spatial resolution show that the fine layers constituting the rings are not necessarily continuous over long distances (e.g., Fig.…”

Section: Discussionmentioning

confidence: 99%

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Block-by-block and layer-by-layer growth modes in coral skeletons

Perrin

Vielzeuf

Ricolleau

et al. 2015

American Mineralogist

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Understanding the dynamics of biomineral growth is a challenging goal of biomineralogy that can be achieved in part by deciphering biomineral structures and chemistries. The morphology, structure, and chemistry of six skeletons of Corallium and Paracorallium species (C. rubrum, C. elatius, C. johnsoni, C. niobe, P. japonicum, and P. thrinax) from the Mediterranean, the Atlantic, and the Pacific oceans have been studied by X-ray micro-computed tomography, polarized light microscope, scanning electron microscope, and electron microprobe. All species have two types of biomineral structures: an inner skeleton and sclerites that are small grains of Mg-calcite found in the living tissues surrounding the skeleton. All skeletons display a central core surrounded by an annular domain. In the species studied by electron microprobe (C. rubrum, C. elatius, and P. japonicum), the central core and the annular domains display different chemical compositions with the core richer in magnesium and poorer in sulfur than the annular domain. In terms of structure, special emphasis has been put on central cores for which little data are available. The central cores are made of sclerites and sclerite aggregates within a cement consisting of fine layers of Mg-calcite. On the other hand, the annular parts are made of fine concentric layers of calcite crystallites with only rare sclerites. These contrasting features imply two different growth modes: (1) a "block and cement" mode taking place at the apex of a branch and associated with a fast axial growth rate (~2 mm/yr); and (2) a layer-by-layer mode occurring below the apex and associated with a slow radial growth (~0.2 mm/yr). The change from a growth mode to another is anatomically controlled by the presence of a continuous network of gastrodermal canals around the sub-apical skeleton, preventing to a large extent the aggregation of sclerites. It is generally accepted that the Coralliidae family exhibits different types of skeletogeneses. In contrast with this idea, we observe that all studied Corallium species display remarkable similarities in terms of skeletogenesis and a unifying growth model for the Corallium genus is proposed. Similarities and differences with previous models are discussed. The present study shows that the morphological criterion initially used to establish the genus Paracorallium in the Coralliidae family is inadequate.

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Section: Discussionmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Block-by-block and layer-by-layer growth modes in coral skeletons

Perrin

Vielzeuf

Ricolleau

et al. 2015

American Mineralogist

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“…The similar trend was published from several previous studies. Vielzeuf, et al, (2013) revealed the similar relationship between paleobathymetry and Mg/Ca ratio from the samples from Marseille (France) and Madras (Spain).…”

Section: Acropora Palifera Ld-02 15mentioning

confidence: 79%

Carbonate Biofacies and Paleoecology Analysis Based on Acropora Coral in Ujunggenteng Area, West Java Province, Indonesia

Santoso¹

2017

Ris.Geo.Tam

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Biofacies concept was proposed to approach the carbonate facies determination by using coral species description and ecology reconstruction. Ujunggenteng area was selected for this study because it has modern carbonate rocks with continues distribution and contains many well-preserved coral fossils. Ujunggenteng area can be distinguished into three biofacies: Acropora cervicornis -Acropora palifera biofacies, Acropora gemmifera -Acropora humilis biofacies, and Acropora cervicornisAcropora palmata biofacies. The paleobathymetry analysis had indicated that Acropora cervicornis -Acropora palifera biofacies grew in the deepest environment, between 8 -13 meters depth. Acropora gemmifera -Acropora humilis biofacies lived in a shallower environment between 3 -8 meters depth, and Acropora cervicornis -Acropora palmata biofacies was deposited between 0 -3 meters. The Mg/Ca trend showed a negative correlation with the paleobathymetry result. Decreasing Mg/Ca ratio was related to increasing paleobathymetry.Acropora cervicornis -Acropora palifera biofacies has the smallest Mg/Ca ratio, between 14 -15 mmol. Acropora gemmifera -Acropora humilis biofacies has Mg/Ca ratio between 17 -21 mmol. Acropora cervicornis -Acropora palmata biofacies has the highest Mg/Ca ratio, between 23 -24 mmol. Mg/Ca ratio value was related to paleotemperature, in which the decreasing of Mg/Ca ratio associated to decreasing paleotemperature.

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Experimental and Theoretical Insights into the Bioinspired Formation of Disordered Ba‐Calcite

Seknazi

Levy

Polishchuk

et al. 2018

Adv Funct Materials

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Calcite has the ability to host large amounts of intracrystalline inclusions, a phenomenon that is known to be the case in biominerals and has been demonstrated in bioinspired synthetic systems. In this study, barium ion is focused on as the inclusion. Highly substituted Ba-calcite possesses disordered carbonate orientations, characteristic of 3 3 R R m m symmetry. It is shown that calcite experiences an order-disorder transition, in which the carbonate groups undergo progressive loss of their rotational order with increasing amounts of incorporated Ba, and reach complete rotational disorder for a critical amount of Ba. This transition is characterized and a theoretical model justifying the influence of Ba is proposed. Moreover, the disordered 3 3 R R m m Ba-substituted calcite has been previously identified as a high-temperature phase or as a highly metastable room-temperature phase. Those descriptions are challenged by successfully synthesizing it under slow-rate conditions and by studying its thermal behavior, and it is concluded that the fully disordered Ba-calcite is stable, whereas the transitional, partially disordered Ba-calcite phase is metastable.

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Distribution of sulphur and magnesium in the red coral

Cited by 50 publications

References 46 publications

Block-by-block and layer-by-layer growth modes in coral skeletons

Block-by-block and layer-by-layer growth modes in coral skeletons

Carbonate Biofacies and Paleoecology Analysis Based on Acropora Coral in Ujunggenteng Area, West Java Province, Indonesia

Experimental and Theoretical Insights into the Bioinspired Formation of Disordered Ba‐Calcite

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