Thermodynamic modelling of the Br partition between aqueous solutions and halite

Siemann, Michael G.; Schramm, Michael

doi:10.1016/s0016-7037(99)00385-3

Cited by 52 publications

(30 citation statements)

References 23 publications

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“…K) and SO 4 -Cl-tAlk (total alkalinity) (Equivalent/L) ternary classification diagrams of the salt waters from Northern Apennine and its foredeep. Data from this study (Table 1) behavior during evaporation of seawater and low partition coefficient in halite (Siemann and Schramm 2000), thus water dissolving halite (or other evaporitic chlorides) leads to Br/Cl ratio lower than in seawater (Br/Cl = 1.52 9 10 -3 ). In Fig.…”

Section: Resultsmentioning

confidence: 73%

Salt Waters of the Northern Apennine Foredeep Basin (Italy): Origin and Evolution

et al. 2010

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The salt waters from the Emilia-Romagna sector of the Northern Apennine Foredeep have been investigated using major and trace element and stable isotope (d 2 H, d 18 O, d 37 Cl, d 81 Br and 87 Sr/ 86 Sr ratio). Ca, Mg, Na, K, Sr, Li, B, I, Br and SO 4 vs. Cl diagrams suggest the subaerial evaporation of seawater beyond gypsum and before halite precipitation as primary process to explain the brine's salinity, whereas saline to brackish waters were formed by mixing of evaporated seawater and water of meteoric origin. A diagenetic end-member may be a third component for mud volcanoes and some brackish waters. Salinization by dissolution of (Triassic) evaporites has been detected only in samples from the Tuscan side of the Apennines and/or interacting with the Tuscan Nappe. In comparison with the seawater evaporation path, Ca-Sr enrichment and Na-K-Mg depletion of the foredeep waters reveal the presence of secondary processes such as dolomitization-chloritization, zeolitization-albitization and illitization. Sulfate concentration, formerly buffered by gypsum-anhydrite deposition, is heavily lowered by bacterial and locally by thermochemical reduction during burial diagenesis. From an isotopic point of view, data of the water molecule confirm mixing between seawater and meteoric endmembers. Local 18 O-shift up to ?11% at Salsomaggiore is related to water-rock interaction at high temperature (&150°C) as confirmed by chemical (Mg, Li, Ca distribution) and isotopic (SO 4 -H 2 O) geothermometers. 37 Cl/ 35 Cl and 81 Br/ 79 Br ratios corroborate the Electronic supplementary material The online version of this article (marine origin of the brines and evidence the diffusion of halogens from the deepest and most saline aquifers toward the surface. The 87 Sr/ 86 Sr ratio suggests a Miocene origin of Sr and rule out the hypothesis of a Triassic provenance of the dissolved components for the analyzed waters issuing from the Emilia-Romagna sector of the foredeep. Waters issuing from the Tuscan side of the Apennines and from the Marche sector of the foredeep show higher 87 Sr/ 86 Sr ratios because of the interaction with siliciclastic rocks.

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Section: Resultsmentioning

confidence: 73%

Salt Waters of the Northern Apennine Foredeep Basin (Italy): Origin and Evolution

et al. 2010

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“…Although bromide and chloride are both monovalent anions of similar ionic radii (Br À ¼ 1.96 Å , Cl À ¼ 1.81 Å ), Cl À is strongly preferentially partitioned over Br À into sodium, potassium, and magnesium halogen salts during precipitation (Hanor, 1987;Siemann and Schramm, 2000). During the initial evaporation of seawater, both bromide and chloride increase in concentration in the residual hypersaline waters, and the Br/Cl ratio of these waters does not vary ( Figure 8).…”

Section: Chloride and Bromidementioning

confidence: 99%

Deep Fluids in Sedimentary Basins

Kharaka

Hanor

2014

Treatise on Geochemistry

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“…The bromine content of two surface-piercing Ara salt samples was determined from two separate weightings per sample by ion chromatography at the Department of Mineralogy, Geochemistry and Salt Deposits at Technical University of Clausthal-Zellerfeld (Germany) following the method described by Siemann and Schramm (2000). The halite (\10 mg) was dissolved in distilled water at a ratio of 1:1,000.…”

Section: Grain and Subgrain Size Analysismentioning

confidence: 99%

Deformation mechanisms of deeply buried and surface-piercing Late Pre-Cambrian to Early Cambrian Ara Salt from interior Oman

Schoenherr

Schléder

Urai

et al. 2009

Int J Earth Sci (Geol Rundsch)

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We compared microstructures of Late PreCambrian to Early Cambrian Ara Salt diapirs from the deep subsurface (3.5-5 km) of the South Oman Salt Basin and from surface-piercing salt domes of the Ghaba Salt Basin. Laterally, these basins are approximately 500 km apart but belong to the same tectono-sedimentary system. The excellent data situation from both wells and outcrops allows a unique quantification of formation and deformation mechanisms, spanning from sedimentation to deep burial, and via re-activated diapir rise to surface piercement. Microstructures of gamma-irradiated and etched thin sections indicate dislocation creep and fluid-assisted grain boundary migration as the main deformation mechanisms operating in the deep subsurface. Microstructures from the surface are characterised by large 'old' subgrain-rich crystals. These 'old' grains are partly replaced by 'new' subgrain-free and subgrain-poor crystals, which show gamma irradiation-decorated growth bands and fibrous microstructures, indicative of pressure solution creep and static recrystallisation, most likely due to surface piercement and exposure. Using subgrain size piezometry, the maximum differential stresses for the subsurface salt is 1.7 MPa and those for the surface-piercing salt is 3.4 MPa, the latter value displaying the high stress conditions in the diapir 'stem' as the salt rises on its way to the surface.

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Thermodynamic modelling of the Br partition between aqueous solutions and halite

Cited by 52 publications

References 23 publications

Salt Waters of the Northern Apennine Foredeep Basin (Italy): Origin and Evolution

Salt Waters of the Northern Apennine Foredeep Basin (Italy): Origin and Evolution

Deep Fluids in Sedimentary Basins

Deformation mechanisms of deeply buried and surface-piercing Late Pre-Cambrian to Early Cambrian Ara Salt from interior Oman

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