Observations on the incorporation of trace elements in halite of Oligocene salt beds, Bourg-en-Bresse Basin, France

Moretto, Robert

doi:10.1016/0016-7037(88)90148-2

Cited by 31 publications

(11 citation statements)

References 10 publications

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“…curves based on natural halite standards. Moreover, bromine was determined (also by X-ray fluorescence using a Phillips PW2400 spectrometer) at the University of Barcelona in 21 samples from the Zdrada IG6 borehole that were previously processed in order to eliminate as much as possible bromine-rich fluid inclusion and grain-boundary brines; the used technique is described by Moretto (1988). The error of bromine determination was about 3% in both laboratories.…”

Section: Methodsmentioning

confidence: 99%

Polyhalite occurrence in the Werra (Zechstein, upper Permian) peribaltic basin of Poland and Russia: Evaporite facies constraints

Peryt

Tomassi-Morawiec

Czapowski

et al. 2005

Carbonates Evaporites

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Polyhalite is a common constituent of many ancient evaporite sequences, especially Permian and Neogene ones, that is related to the Na-K-Mg-CI-S0 4 type of marine brines in those time intervals. There are four polyhalite deposits in the Zechstein of northern Poland, and more than ten polyhalite-bearing areas in the adjacent part of Russia, and they are commonly accompanied by K-Mg chlorides. Most polyhalite occurrences are related to the upper part of the Lower Werra Anhydrite and in most cases, polyhalite deposits are concentrated at the sulfate platform close to its boundary with platform slope, where they can pass horizontally into polyhalite beds occurring in the Oldest Halite. The bromine content in samples of the Oldest Halite ranges from 40 -120 ppm and the composition of fluid inclusions in halite are characteristic of halite precipitated from seawater concentrated to the early and middle stages of halite precipitation. The 8 180 and 8 34S values for sulfates are 10.03%0 -13.50%0 and 10.03%0 -12.14%0, respectively, and the 8 37CI values for halites from -0.1 %0 to +0.4%0 support their marine origin. Bromine distribution in the Oldest Halite and the occurrence of anhydrite intercalations indicate fluctuations of the brine density during the Oldest Halite deposition. The formation of polyhalite was preceded by the syndepositional dehydration of the original gypsum deposit and it appears that the anhydrite was then transformed to polyhalite by reaction with marine brines more evolved than those from which precipitated precursor calcium sulfate minerals. These concentrated brines could have been derived from the evaporation of marine brines and/or inflow of K-and Mg-rich brines that were formed in nearby shallow salt pans occurring in sulfate platform areas and thus sulfate platform areas and adjacent slopes of those platforms were predestined for polyhalite formation.

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Section: Methodsmentioning

confidence: 99%

Polyhalite occurrence in the Werra (Zechstein, upper Permian) peribaltic basin of Poland and Russia: Evaporite facies constraints

Peryt

Tomassi-Morawiec

Czapowski

et al. 2005

Carbonates Evaporites

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“…Eleven halite samples were analysed by X‐ray diffraction for mineralogical composition, and by X‐ray fluorescence for Br geochemistry. The crystal lattice and fluid inclusions incorporate the Br content of the enclosing brine (Moretto, 1988). Samples were ground under ethylene glycol to remove all fluid inclusions.…”

Section: Samples and Methodsmentioning

confidence: 99%

A depositional model for the terminal Neoproterozoic–Early Cambrian Ara Group evaporites in south Oman

Schröder

Schreiber

Amthor³

et al. 2003

Sedimentology

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Six evaporite–carbonate sequences are recognized in the terminal Neoproterozoic–Early Cambrian Ara Group in the subsurface of Oman. Individual sequences consist of a lower, evaporitic part that formed mainly during a lowstand systems tract. Overlying platform carbonates contain minor amounts of evaporites and represent transgressive and highstand systems tracts. Detailed sedimentological and geochemical investigation of the evaporites allowed reconstruction of the depositional environment, source of brines and basin evolution. At the beginning of the evaporative phase (prograding succession), a shallow‐water carbonate ramp gradually evolved into a series of shallow sulphate and halite salinas. Minor amounts of highly soluble salts locally record the last stage of basin desiccation. This gradual increase in salinity contrasts sharply with the ensuing retrograding succession in which two corrosion surfaces separate shallow‐water halite from shallow‐water sulphate, and shallow‐water sulphate from relatively deeper water carbonate respectively. These surfaces record repeated flooding of the basin, dissolution of evaporites and stepwise reduction in salinity. Final flooding led to submergence of the basin and the establishment of an open‐water carbonate ramp. Marine fossils in carbonates and bromine geochemistry of halite indicate a dominantly marine origin for the brines. The Ara Group sequences represent a time of relatively stable arid climate in a tectonically active basin. Strong subsidence allowed accommodation of evaporites with a cumulative thickness of several kilometres, while tectonic barriers simultaneously provided the required restricted conditions. Subsidence allowed evaporites to blanket basinal and platform areas. The study suggests a deep‐basin/shallow‐water model for the evaporites.

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“…There are four methods for the removal of this solution: (1) Washing with an organic solvent (Moretto, 1988;García-Veigas et al, 2009) (e.g. ethanol, ethanol-glycol, or acetone), yet the effect of salting-out in organic solvent with high salinity would occur (Xu et al, 1991).…”

Section: Methodsmentioning

confidence: 99%

Model for the decomposition of carnallite in aqueous solution

Cheng

Hai

et al. 2015

International Journal of Mineral Processing

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Observations on the incorporation of trace elements in halite of Oligocene salt beds, Bourg-en-Bresse Basin, France

Cited by 31 publications

References 10 publications

Polyhalite occurrence in the Werra (Zechstein, upper Permian) peribaltic basin of Poland and Russia: Evaporite facies constraints

Polyhalite occurrence in the Werra (Zechstein, upper Permian) peribaltic basin of Poland and Russia: Evaporite facies constraints

A depositional model for the terminal Neoproterozoic–Early Cambrian Ara Group evaporites in south Oman

Model for the decomposition of carnallite in aqueous solution

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