Growth mechanisms in dinosaur eggshells: an insight from electron backscatter diffraction

Moreno‐Azanza, Miguel; Mariani, Elisabetta; Bauluz, Blanca

doi:10.1080/02724634.2012.710284

Cited by 33 publications

(71 citation statements)

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“…Both areas reflect random orientations in the pole figures (Figure 4(E)). The misorientation image shows green and blue colourations to those crystals with the same orientation, whereas the deep purple and yellow colourations sign those crystals that have lost the original orientation and present a random distribution in pole figure probably due to diagenesis, as is shown in Pérez-Huerta et al (2007) and Moreno-Azanza et al (2013).…”

Section: Computer-integrated-polarisationmentioning

confidence: 93%

“…In the case of biominerals of hundreds of micrometres of size, i.e. egg shells (Moreno-Azanza et al 2013) or belemnites (Dauphin et al 2007), this methodology can be applied with thin sections. Finally, many museum samples of fossils, for which destructive techniques are not allowed, are represented by thin sections of materials, representing ideal target samples for the use of the CIP methodology.…”

Section: Evaluation Of Cip As a Technique For Fossilsmentioning

confidence: 99%

“…This last fact is very helpful in geochemical studies with focus on palaeoclimatic and palaeoenvironmental interpretations, in which good fossil preservation may reflect primary chemical signals of skeletons and shells (Grossman et al 1996;Mii et al 2001;Rosales et al 2004). Techniques routinely used in the study of biomineralisation can also be used to inform about the preservation state of fossils (Pérez-Huerta et al 2007;Stolarski et al 2007;Frýda et al 2009;Grellet-Tinner et al 2011;Lee et al 2012;Moreno-Azanza et al 2013;Torney et al, 2013).…”

Section: Introductionmentioning

confidence: 97%

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Computer-integrated polarisation (CIP) in the analysis of fossils: a case of study in a Palaeozoic coral (Sinopora, Syringoporicae, Carboniferous)

Coronado

Pérez‐Huerta

2014

Historical Biology

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Computer-integrated polarisation (CIP) method has been applied satisfactorily in the study of fossils skeletons of Sinopora (tabulate coral, Auloporida and Carboniferous). A previous characterisation of sample by scanning electron microscopy, atomic force microscopy and cathodoluminescence (CL) with the purpose of distinguishing the diagenetical alteration was done. Subsequently, a crystallographic comparison between CIP and electron-backscattering diffraction has been made getting a very good correlation between both methods. The CIP method allows obtaining c-axis orientation images, pole figures, and measure and mapping the misorientation of uniaxial biominerals in recent and fossil skeletons. This technique can only be used in uniaxial biominerals (calcite, quartz and hydroxylapatite), limiting its use for biaxial or bimineralic and polimineralic biominerals. CIP method has good spatial resolution (limited by camera); in our example 90 nm. The main advantage of this technique, versus other with similar properties, is the fast acquisition of data in low and high magnifications. This method does not require special treatment of samples and can be very useful for the analysis of microstructures in thin and ultra-thin sections. CIP method detects diagenetic alterations in fossil skeletons by modifications in the inner arrangement of biominerals, which combined with CL offers valuable geochemical and crystallographic information.

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Section: Computer-integrated-polarisationmentioning

confidence: 93%

Section: Evaluation Of Cip As a Technique For Fossilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Computer-integrated polarisation (CIP) in the analysis of fossils: a case of study in a Palaeozoic coral (Sinopora, Syringoporicae, Carboniferous)

Coronado

Pérez‐Huerta

2014

Historical Biology

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“…Computed tomography and phase contrast synchrotron microtomography allow high-resolution imaging of eggs, which is necessary for identification of in ovo embryonic remains, while avoiding mechanical preparation and potential damage to the specimens (Fernandez et al 2012). Finally, two recent studies of fossil eggs also include electron backscatter diffraction and orientation contrast imaging to "map" the orientation of crystal growth (Grellet-Tinner et al 2012;Moreno-Azanza, Mariani et al 2013). …”

Section: Methods Used In the Study Of Fossilized Eggsmentioning

confidence: 99%

A Review of the Fossil Record of Turtle Reproduction: Eggs, Embryos, Nests and Copulating Pairs

Lawver

Jackson

2014

Bulletin of the Peabody Museum of Natural History

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“…; Moreno‐Azanza et al . ), as well as to the effects of diagenesis (Perez‐Huerta et al . , ; Cusack et al .…”

mentioning

confidence: 99%

Crystallographic orientations of structural elements in skeletons of Syringoporicae (tabulate corals, Carboniferous): implications for biomineralization processes in Palaeozoic corals

2014

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The crystallographic orientation of structural elements in skeletons of representatives of Carboniferous Syringoporicae (Auloporida) has been analysed by scanning electron microscopy (SEM), petrographic microscopy and electron backscatter diffraction (EBSD) on specimens from the Iberian Peninsula. The skeletons of the tabulate corals of the Syringoporicae consist of biogenic calcite crystals, and their microstructure is composed of lamellae, fibres and granules, or of a combination of these. Independent of the microstructure, the c-axis is oriented towards the lumen, quasi-perpendicular to the growth direction of the skeleton (perpendicular to the morphological axis lamellae, parallel to fibres). Most phaceloid taxa have a turbostratic distribution, as a biogenic response to prevent the cleavage of crystals. Cerioid and some phaceloid corals, whose microstructure is conditioned by wall elements, do not exhibit turbostratic distribution. Wall elements are determined by the biology of each taxon. Holacanth septal spines are composed of fibres arranged in a cone-shape structure, sometimes clamped to the external part of the corallite and show a complex crystallography. Monacanth septal spines are spindle shaped and composed of bundles of fibres. Tabulae are composed of lamellae. Their development and crystallographic orientation depends on the position of the epithelium in each case. Shared walls are formed by a combination of the walls of two independent corallites with a median lamina, composed of granules; these have a crystallographic orientation between that of the two corallites. The growth of the microstructure is derived by a coordinated stepping mode of growth, similar to other groups of organisms such as molluscs and scleractinians. The nucleation and formation of packages of cooriented microcrystals suggest a growth mode similar to mineral bridges with a competitive growth mode between each crystal. The growth pattern of corallites suggests that the growth direction is divided into two main components: a horizontal growth direction towards the lumen and a vertical direction towards the top.

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Growth mechanisms in dinosaur eggshells: an insight from electron backscatter diffraction

Cited by 33 publications

References 50 publications

Computer-integrated polarisation (CIP) in the analysis of fossils: a case of study in a Palaeozoic coral (Sinopora, Syringoporicae, Carboniferous)

Computer-integrated polarisation (CIP) in the analysis of fossils: a case of study in a Palaeozoic coral (Sinopora, Syringoporicae, Carboniferous)

A Review of the Fossil Record of Turtle Reproduction: Eggs, Embryos, Nests and Copulating Pairs

Crystallographic orientations of structural elements in skeletons of Syringoporicae (tabulate corals, Carboniferous): implications for biomineralization processes in Palaeozoic corals

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