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Boron isotope geochemistry of N a‐bicarbonate, N a‐chloride, and C a‐chloride waters from the N orthern A pennine F oredeep basin: other pieces of the sedimentary basin puzzle
Author(s) -
Boschetti T.,
Toscani L.,
Salvioli Mariani E.
Publication year - 2015
Publication title -
geofluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.44
H-Index - 56
eISSN - 1468-8123
pISSN - 1468-8115
DOI - 10.1111/gfl.12124
Subject(s) - chloride , diagenesis , geology , geochemistry , carbonate , sedimentary depositional environment , brine , sedimentary rock , bicarbonate , mineralogy , facies , chemistry , structural basin , geomorphology , organic chemistry
The boron stable isotope ratio δ 11 B of 12 water samples representative of three chemical facies (fresh N a‐bicarbonate, brackish N a‐chloride, saline, and brine C a‐chloride) has been analyzed. Interpretation of the δ 11 B data, along with the chemical compositions, reveals that N a‐carbonate waters from the N orthern A pennine are of meteoric origin, with boron contributions from clay desorption and mixing with seawater‐derived fluids of N a‐chloride or C a‐chloride compositions. The comparison of our new results with the literature data on other sedimentary basins of M editerranean, and worldwide, confirms the contribution of N a‐bicarbonate waters to the genesis of mud volcano fluids. The N a‐chloride sample of S alvarola ( SAL ), which may represent the end‐member of the mud volcanoes, and the C a‐chloride brine water from S alsomaggiore ( SM ) indicate boron release from clays compatible with the diagenetic process. The empirical equation:δ 11 B = [ 5.1364 × ln(1/B) mg l − 1] + 44.601 relating 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:T ∘ C = [ δ 11 B − 38.873( ± 1.180 ) ] / [ − 0.164( ± 0.012 ) ]The application of this equation to obtain reservoir temperatures from δ 11 B 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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