Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/225059
COMPARTIR / EXPORTAR:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Invitar a revisión por pares abierta
Título

Orientation patterns of aragonitic crossed-lamellar, fibrous prismatic and myostracal microstructures of modern Glycymeris shells

AutorCrippa, Gaia; Griesshaber, Erika; Checa, Antonio G. CSIC ORCID; Harper, Elizabeth M.; Simonet Roda, Maria; Schmahl, Wolfgang W.
Fecha de publicación23-oct-2020
EditorElsevier BV
CitaciónJournal of Structural Biology 212(3): 107653 (2020)
ResumenThe shells of the bivalves Glycymeris glycymeris and Glycymeris nummaria are widely used for environmental studies. They consist of aragonite and comprise four different microstructures and textures from outer to inner shell surfaces: crossed-lamellar, myostracal, complex crossed-lamellar and fibrous prismatic. We characterize with SEM, EBSD, laser-confocal microscopy and AFM imaging mineral unit size, morphology and orientation of crystallites in the different microstructural arrangements and at the transition from one microstructure to the other. We also characterize the microstructure and texture of adductor and pedal retractor myostraca and address structural characteristics at the transition from crossed-lamellar to myostracal assemblies. We find that the crossed-lamellar layer has a three-dimensional crystallographic orientational order. Each set of first-order lamellae consists of twinned aragonite; the two sets of first-order lamellae are misoriented to each other by about 30 to 40° while retaining an approximately parallel a-axis; they do not show any particular twin relationship. Myostracal aragonite grows homoepitactically onto the crossed-lamellar aragonite, but is clearly a separate microstructure, with its own crystallite size and morphology. Within adductor and pedal myostraca, prisms increase in size towards inner surfaces. In contrast to the other shell layers, the myostraca form through competitive growth. The complex crossed-lamellar aragonite initially inherits the three-dimensional texture of the crossed-lamellar microstructure, but with growth develops an axial texture, which is transmitted to the underlying fibrous prismatic microstructure. With this work we provide a modern, unaltered, reference for fossil Glycymeris shells to be used for detection of diagenetic overprint in fossil Glycymeris analogs.
Versión del editorhttp://dx.doi.org/10.1016/j.jsb.2020.107653
URIhttp://hdl.handle.net/10261/225059
DOI10.1016/j.jsb.2020.107653
Identificadoresdoi: 10.1016/j.jsb.2020.107653
issn: 1095-8657
Aparece en las colecciones: (IACT) Artículos




Ficheros en este ítem:
Fichero Descripción Tamaño Formato
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo

CORE Recommender

SCOPUSTM   
Citations

19
checked on 19-mar-2024

WEB OF SCIENCETM
Citations

20
checked on 26-feb-2024

Page view(s)

106
checked on 27-mar-2024

Download(s)

31
checked on 27-mar-2024

Google ScholarTM

Check

Altmetric

Altmetric


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.