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This paper constrains fluid flow and chemistry in Miocene dolomites of Spain, where dolomitization has been ascribed to ascending freshwater–mesohaline mixing. End-Miocene dolomite formed as replacement and cement with the same widespread cathodoluminescence. Fluid inclusion final melting temperatures of ice (Tm ice: −0.2 to −2.3 °C) indicate mixing of freshwater and evaporated seawater. δ18O and δ13C data mostly show positive covariation, and only some have variable δ13C and invariant δ18O, arguing that mixing was more important than sulphate reduction. Data range from +0.9 to +6.0‰ for δ18...

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