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Título:
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Dolomite cation order in the geological record
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Autores:
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Pina Martínez, Carlos Manuel ;
Pimentel Guerra, Carlos ;
Crespo López, Ángel
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Tipo de documento:
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texto impreso
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Editorial:
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Elsevier Science B.V., Amsterdam., 2020-08-05
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/embargoedAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Geología: Cristalografía
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Tipo = Artículo
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Resumen:
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Dolomite is a carbonate mineral frequently found in sedimentary rocks from Proterozoic to Holocene. In the Iberian Peninsula, dolomites appear in a wide number of geological formations and they can be considered as representative of dolomites crystallised in most (post)sedimentary environments on Earth. In this paper, we present a first systematic study of the cation order of dolomites formed from Neoproterozoic to late Holocene. We found that the lowest values of cation order (quantified by measuring I01.5/I11.0 intensity ratios on diffractograms) mainly correspond to dolomites formed in about the last 30 Myr. In contrast, older dolomites usually reach maximum I01.5/I11.0 intensity ratios. Furthermore, higher values of cation order seem to be related to higher values of the full width half maximum of 10.4 diffraction peaks (FWHM10.4). Assuming that a decrease in FWHM10.4 (i.e. an increase in the crystallite size) in sedimentary environments indicates mineral ripening, our results show that Mg-Ca ordering in dolomites might take place mainly by a dissolution-(re)crystallisation ageing process operating over large geological periods.
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En línea:
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https://eprints.ucm.es/id/eprint/60827/1/Pina_Pimentel_Crespo%20%282020%29%20MS.pdf
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