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dc.contributor.author
Álvaro,Jimenez Berrocoso
dc.contributor.author
Olivero, Eduardo Bernardo
dc.contributor.author
Elorza, Javier
dc.date.available
2022-07-19T12:58:03Z
dc.date.issued
2006-12
dc.identifier.citation
Álvaro,Jimenez Berrocoso; Olivero, Eduardo Bernardo; Elorza, Javier; New petrographic and geochemical insights on diagenesis and palaeoenvironmental stress in Late Cretaceous inoceramid shells from the James Ross Basin, Antarctica; Cambridge University Press; Antarctic Science; 18; 3; 12-2006; 357-376
dc.identifier.issn
0954-1020
dc.identifier.uri
http://hdl.handle.net/11336/162483
dc.description.abstract
New petrographic and geochemical insights from inoceramid bivalve shells of lower Campanian (Marambio Group, James Ross Basin, Antarctica) show that they suffered significant palaeoenvironmental stress just before their disappearance in the southern high latitudes. Inoceramid data have mainly been derived from shell fragments of the large form Antarcticeramus rabotensis Crame & Luther, collected at stratigraphical levels marking the early disappearance of inoceramids in the James Ross Basin (10 m.y. before the Cretaceous/Tertiary boundary in Antarctica). Cathodoluminescence studies and minor and trace element intra-shell variations in A. rabotensis shells, along with their whole shell geochemistry (major, minor, and trace elements, including REE), have revealed evidence of only weak diagenesis but significant palaeoenvironmental stress. The most relevant evidence of such adverse palaeoenvironmental conditions in A. rabotensis shells is reflected by marked growth interruptions in the normal shell layering, including the occurrence of a previously undetected inner aragonitic nacreous layer formed of alternating aragonitic and calcitic sublayers. The weak diagenesis produced characteristic geochemical intra-shell variations which have subsequently been detected in the inoceramid shell microstructure, specially in the inner aragonitic nacreous layer.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Cambridge University Press
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
CAMPANIAN
dc.subject
CATHODOLUMINESCENCE
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GEOCHEMISTRY
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INOCERAMID EXTINCTION
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LOW MG CALCITE MICROSTRUCTURE
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SHELL GROWTH
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Geología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
New petrographic and geochemical insights on diagenesis and palaeoenvironmental stress in Late Cretaceous inoceramid shells from the James Ross Basin, Antarctica
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-07-04T19:21:52Z
dc.journal.volume
18
dc.journal.number
3
dc.journal.pagination
357-376
dc.journal.pais
Reino Unido
dc.journal.ciudad
Cambridge
dc.description.fil
Fil: Álvaro,Jimenez Berrocoso. Universidad del País Vasco; España
dc.description.fil
Fil: Olivero, Eduardo Bernardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
dc.description.fil
Fil: Elorza, Javier. Universidad del País Vasco; España
dc.journal.title
Antarctic Science
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1017/S0954102006000411
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/antarctic-science/article/abs/new-petrographic-and-geochemical-insights-on-diagenesis-and-palaeoenvironmental-stress-in-late-cretaceous-inoceramid-shells-from-the-james-ross-basin-antarctica/4A37DF2E7538E879E0F15C7E4B55CF21
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