000148504 001__ 148504
000148504 005__ 20250214141229.0
000148504 0247_ $$2doi$$a10.1016/j.chemgeo.2024.122529
000148504 0248_ $$2sideral$$a141876
000148504 037__ $$aART-2025-141876
000148504 041__ $$aeng
000148504 100__ $$aEntrena, A.
000148504 245__ $$aBimineralic calcite-aragonite rafts in the hypogeous lakes of Cova dets Ases (Mallorca): Controls on precipitation and polymorphism
000148504 260__ $$c2025
000148504 5060_ $$aAccess copy available to the general public$$fUnrestricted
000148504 5203_ $$aCalcite-aragonite bimineralic rafts and related waters from hypogenic lakes in the coastal cave of “Cova dets Ases”, Mallorca, have been analyzed for mineralogy and geochemistry (including stable isotopes). The main objective has been the evaluation of the factors that control the chemical and mineralogical composition of the precipitates as they are another natural example of the classical problem of aragonite vs calcite precipitation.
The hydrochemistry of the lakes in these coastal caves is mainly conditioned by the mixture of fresh and marine waters. The percentage of mixing, together with the CO2 degasification from the lakes water, seems to play a fundamental role in the precipitation of the carbonate rafts. However, their presence in the studied lakes does not show a homogeneous distribution in space and time and no clear relation has been found between that distribution and the evolution of any of the monitored environmental variables. With respect to their mineralogy, the main factor that seems to control the dominant bimineralic composition of the rafts studied here is the Mg/Ca ratio in the waters, which means the percentage of marine component in those waters. The variations of this ratio, in combination with changes in the degasification rate and in the oversaturation with respect to calcite and aragonite will condition the presence of one or the other polymorph. Even small microenvironmental variations seem to affect the order of precipitation of these bimineralic rafts.
Another important issue in this work is that the data obtained in this natural system have been used to check the most suitable δ18O isotope fractionation equations for the paleotemperature calculations from rafts precipitated in the past under similar conditions.
000148504 536__ $$9info:eu-repo/grantAgreement/ES/MICIN/BES-C2017-009$$9info:eu-repo/grantAgreement/ES/MICIU/PID2020-112720GB-I00/AEI/10.13039/501100011033
000148504 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000148504 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000148504 700__ $$0(orcid)0000-0003-1463-1682$$aAuqué, L.F.$$uUniversidad de Zaragoza
000148504 700__ $$0(orcid)0000-0001-5645-9150$$aGimeno, M.J.$$uUniversidad de Zaragoza
000148504 700__ $$aFornós, J.J.
000148504 7102_ $$12000$$2685$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Petrología y Geoquímica
000148504 773__ $$g673 (2025), 122529 [22 pp.]$$pChem. geol.$$tCHEMICAL GEOLOGY$$x0009-2541
000148504 8564_ $$s2996043$$uhttps://zaguan.unizar.es/record/148504/files/texto_completo.pdf$$yPostprint$$zinfo:eu-repo/date/embargoEnd/2026-12-04
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000148504 909CO $$ooai:zaguan.unizar.es:148504$$particulos$$pdriver
000148504 951__ $$a2025-02-14-14:11:28
000148504 980__ $$aARTICLE