Dolomite cation order in the geological record



Downloads per month over past year

Pina Martínez, Carlos Manuel and Pimentel Guerra, Carlos and Crespo López, Ángel (2020) Dolomite cation order in the geological record. Chemical geology, 547 (119667). ISSN 0009-2541

[thumbnail of Pina_Pimentel_Crespo (2020) MS.pdf] PDF
Restringido a Repository staff only hasta 5 August 2022.


Official URL:


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.

Item Type:Article
Uncontrolled Keywords:Dolomite; Iberian Peninsula; Geological record; Cation ordering; Crystallite size; Dissolution-crystallisation; X-ray Powder Diffraction
Subjects:Sciences > Geology > Crystallography
ID Code:60827
Deposited On:09 Jun 2020 10:03
Last Modified:09 Jun 2020 11:11

Origin of downloads

Repository Staff Only: item control page