Abstract
AbstractThe boron stable isotope ratio δ11Bof 12 water samples representative of three chemical facies (freshNa‐bicarbonate, brackishNa‐chloride, saline, and brineCa‐chloride) has been analyzed. Interpretation of the δ11Bdata, along with the chemical compositions, reveals thatNa‐carbonate waters from theNorthernApennine are of meteoric origin, with boron contributions from clay desorption and mixing with seawater‐derived fluids ofNa‐chloride orCa‐chloride compositions. The comparison of our new results with the literature data on other sedimentary basins ofMediterranean, and worldwide, confirms the contribution ofNa‐bicarbonate waters to the genesis of mud volcano fluids. TheNa‐chloride sample ofSalvarola (SAL), which may represent the end‐member of the mud volcanoes, and theCa‐chloride brine water fromSalsomaggiore (SM) indicate boron release from clays compatible with the diagenetic process. The empirical equation:urn:x-wiley:14688115:media:gfl12124:gfl12124-math-0001relating boron concentration and the stable isotope composition of the fluids observed in this study and the literature is proposed to trace the effect of diagenesis in sedimentary basins. A geothermometer associated to the diagenetic equation is also proposed:urn:x-wiley:14688115:media:gfl12124:gfl12124-math-0002The application of this equation to obtain reservoir temperatures from δ11B compositions of waters should be carefully evaluated against the results obtained from other chemical and isotopic geothermometers from other basins around the world.
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