Microstructure, nanostructure and composition of the shell of Concholepas concholepas (Gastropoda, Muricidae)

Dauphin, Yannicke; Guzmán, Nury; Denis, A.; Cuif, Jean‐Pierre; Ortlieb, Luc

doi:10.1016/s0990-7440(03)00022-6

Cited by 55 publications

(41 citation statements)

References 17 publications

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“…The transformation mechanism presented here may well represent a common strategy in biomineralization, bearing in mind the widespread use of precursor ACC phases in biology and the many cases in which 30-to 50-nm spherulitic structures have been observed in biogenic calcium carbonate minerals from diverse phyla (31)(32)(33)(34)(35).…”

Section: Resultsmentioning

confidence: 99%

Transformation mechanism of amorphous calcium carbonate into calcite in the sea urchin larval spicule

Politi

Metzler²,

Abrecht³

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

385

423

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Sea urchin larval spicules transform amorphous calcium carbonate (ACC) into calcite single crystals. The mechanism of transformation is enigmatic: the transforming spicule displays both amorphous and crystalline properties, with no defined crystallization front. Here, we use X-ray photoelectron emission spectromicroscopy with probing size of 40–200 nm. We resolve 3 distinct mineral phases: An initial short-lived, presumably hydrated ACC phase, followed by an intermediate transient form of ACC, and finally the biogenic crystalline calcite phase. The amorphous and crystalline phases are juxtaposed, often appearing in adjacent sites at a scale of tens of nanometers. We propose that the amorphous-crystal transformation propagates in a tortuous path through preexisting 40- to 100-nm amorphous units, via a secondary nucleation mechanism.

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Section: Resultsmentioning

confidence: 99%

Transformation mechanism of amorphous calcium carbonate into calcite in the sea urchin larval spicule

Politi

Metzler²,

Abrecht³

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

385

423

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“…1b-d). The thickness of the outer layer increases from the apex toward the pallial margin (Dauphin et al, 2003;Guzmán, 2004). …”

Section: Micro-and Nanostructuresmentioning

confidence: 99%

“…The main band at 1685 cm 1 may be assigned to a turn or a β-sheet structure. To estimate the organic/mineral ratio in the calcitic layers from FTIR spectra, two ratios were used (Dauphin et al, 2003). In modern samples, the ratios have values of 0.23 and 0.07, for AmideI/878 and AmideA/878, respectively (Table 2).…”

Section: Modern Shellsmentioning

confidence: 99%

Diagenetic changes in <i>Concholepas concholepas</i> shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions

Guzmán¹,

Dauphin

Cuif

et al. 2009

Biogeosciences

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Abstract. Variations in the chemical composition of fossil biogenic carbonates, and in particular of mollusc shells, have been used in a range of palaeoenvironmental reconstructions. It is of primary importance, therefore, to detect and understand the diagenetic processes that may modify the original chemical signature. This microstructural and biogeochemical study focuses on modern and fossil (Holocene and Pleistocene) shells of a littoral gastropod of Northern Chile, and on the characterization of mineral component transformations at the nanometric scale and concomitant intracrystalline organic compound modifications. The inner aragonite layer of the shell exhibits more complex deteriorations than the calcite layer. This preliminary study confirms that physical and chemical alterations of various components of mollusc shell biocrystals are complex and might manifest in different ways even within a single individual. The single criterion of determining the mineralogical composition to verify the conservation state of shell samples is insufficient.

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“…In 1930, for the first time, Boggild made a relatively comprehensive research on the interior structure of the mollusk shell according to its mineralogy and crystallographic characteristics; many data about microcrystal structures of shells including that from monoplacophora, bivalve, gastropod and cephalopod have been reported [1][2][3][4][5][6][7][8][9][10] . A lot of researchers thought that the most typical microstructure of the shell of mollusks is made of aragonite crossed lamellar [2,9] .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and element composition of shell plates of Liolophura japonica

Chen

2010

Wuhan Univ. J. Nat. Sci.

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The microstructure characteristics of shell plates of chiton Liolophura japonica Lischke were analyzed using environmental scanning electron microscopy (ESEM). The results show that the internal structure of the shell plate of chiton Liolophura japonica is composed of seven calcium layers which were crossed lamellar crystallites, homogeneous structure, granular crystallites, and trabecular type crystallites. The element compositions of shell plates were analyzed using X-ray photoelectron spectroscopy (XPS). The results determined by XPS show that the surface chemical states of various layers are different. There are 13 elements (Na, O, N, C, S, P, Ca, Cl, Si, Al, K, Fe, Mg) on the shell plate of chiton L. japonica. Among the 13 elements, 11 are on the outside pigment layer except K and S. Among seven layers of shell plate, there is the largest quantity of elements on the outside pigment layer, and the least quantity of elements is on layer C (Articulamentum auctorum). There are 7 elements on the layer C (Articulamentum auctorum). Besides calcium carbonate, there are some inorganic compounds on the shell plate, such as NaCl, MgO, Al 2 O 3 , silicate, sulfate and phosphate. There are some organic chemical components, such as carbohydrate, organic sulfide, and organic nitride on the shell plates. Key words: Liolophura japonica; environmental scanning electron microscope; X-ray photoelectron spectroscopy (XPS); microstructure of shell plate CLC number: Q 959

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Microstructure, nanostructure and composition of the shell of Concholepas concholepas (Gastropoda, Muricidae)

Cited by 55 publications

References 17 publications

Transformation mechanism of amorphous calcium carbonate into calcite in the sea urchin larval spicule

Transformation mechanism of amorphous calcium carbonate into calcite in the sea urchin larval spicule

Diagenetic changes in <i>Concholepas concholepas</i> shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions

Microstructure and element composition of shell plates of Liolophura japonica

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Microstructure, nanostructure and composition of the shell of Concholepas concholepas (Gastropoda, Muricidae)

Cited by 55 publications

References 17 publications

Transformation mechanism of amorphous calcium carbonate into calcite in the sea urchin larval spicule

Transformation mechanism of amorphous calcium carbonate into calcite in the sea urchin larval spicule

Diagenetic changes in &lt;i&gt;Concholepas concholepas&lt;/i&gt; shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions

Microstructure and element composition of shell plates of Liolophura japonica

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Diagenetic changes in <i>Concholepas concholepas</i> shells (Gastropoda, Muricidae) in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions