Polyhalite and its analogous triple salts

Wollmann, Georgia; Freyer, Daniela; Voigt, Wolfgang

doi:10.1007/s00706-007-0835-7

Cited by 23 publications

(18 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 In a next step, the fields of crystallization from aqueous solutions at ambient temperatures shall be investigated. Because crystallization of polyhalite proceeds very slowly, the experimental data will be combined with a thermodynamic model based on Pitzer's equations.…”

Section: Introductionmentioning

confidence: 99%

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Wollmann

Voigt

2008

J. Chem. Eng. Data

Self Cite

View full text Add to dashboard Cite

The search for literature data in the ternary systems M 2+ , Ca 2+ + SO 4 2-+ H 2 O (M ) Mg, Mn, Co, Ni, Cu, Zn) revealed a lack of data. A reason might be the difficulties of Ca analysis at high concentrated bivalent metal solutions. The solubility of gypsum was determined in MSO 4 solutions (M ) Mg, Mn, Co, Ni, Cu, Zn) over a broad concentration range at T ) 298.15 K and T ) 313.15 K. With increasing magnesium and heavy metal sulfate, respectively, the gypsum solubility decreases to a minimum and rises afterward to a maximum at about 1.2 mol MSO 4 /kg. Above that concentration, the solubility of gypsum decreases again until saturation with MSO 4 . At both temperatures and in the whole concentration range, no double salt formation was noticed. With increasing temperature, the solubility of gypsum increases also.

show abstract

Section: Introductionmentioning

confidence: 99%

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Wollmann

Voigt

2008

J. Chem. Eng. Data

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the wet hexary system Na + , K + , Mg 2+ , Ca 2+ /Cl − , SO 4 2− //H 2 O, polyhalite is also stable at room temperature (Wollmann 2010). Under laboratory conditions, the dehydration process of polyhalite starts at 255 °C and is completed at 343 °C (Wollmann et al 2008). As will be argued in the present study, polyhalite precipitated from migrating fluids through the mudrock and mudrock-anhydrite sequences.…”

Section: Introductionmentioning

confidence: 99%

Origin of deformed halite hopper crystals, pseudomorphic anhydrite cubes and polyhalite in Alpine evaporites (Austria, Germany)

Leitner

Neubauer

Marschallinger

et al. 2012

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

The Alpine Haselgebirge Formation represents an Upper Permian to Lower Triassic evaporitic rift succession of the Northern Calcareous Alps (Eastern Alps). Although the rocksalt body deposits are highly tectonised, consisting mainly of protocataclasites and mylonites of halite and mudrock, the early diagenetic history can be established from non-tectonised mudrock bodies: Cm-sized euhedral halite hopper crystals formed as displacive cubes within mud just during shallow burial. The crystals were deformed by subsequent compaction. Later, migrating fluids led to the replacement of halite by anhydrite retaining the shapes of deformed halite cubes. Polyhalite formed from subsequent enhanced fluid migration. Mudrock provided water by dewatering, while potassium and magnesium were dissolved from primary salt minerals. When these fluids interacted with sulphates, polyhalite precipitated. 40Ar/ 39 Ar analyses date the polyhalite from within the retaining shapes of deformed halite hoppershaped cubes from two localities to ca. 235-232 Ma (Middle Triassic). At this time, ca. 20-25 Ma after sedimentation, polyhalite crystallised at shallow levels.

show abstract

“…It was first described from Bad Ischl (Stromeyer 1818) and the crystal structure was determined for the first time in Austria (Schlatti et al 1970;Bindi 2005). Under laboratory conditions, using thermal analysis methods, Wollmann et al (2008) found that the dehydration process of polyhalite starts at 255 8C and the dehydration reactions are completed at 343 8C. These temperature boundaries define the upper range of polyhalite as a geochronometer.…”

mentioning

confidence: 99%

“…Polyhalite can be used as practical geochronometer close to its thermal stability boundary. The dehydration starts at c. 255 8C and the dehydration reactions are completed at 343 8C (Wollmann et al 2008). A challenge for the future could be to date specific growth stages of polyhalite by microsampling.…”

mentioning

confidence: 99%

⁴⁰ Ar/ ³⁹ Ar ages of crystallization and recrystallization of rock-forming polyhalite in Alpine rocksalt deposits

Leitner

Neubauer

Genser

et al. 2013

View full text Add to dashboard Cite

Ar data from the region. Illite crystallinity points to temperatures of c. 200 8C. The peak temperature of overprint was at c. 180 8C in the Berchtesgaden mine (vitrinite reflectance, fluid inclusions) and .240 8C in the Altaussee mine (fluid inclusions). These temperatures are below the value of 255 8C, where polyhalite starts to dehydrate. Disturbed age spectra patterns result from multiphase polyhalite growth; however, single phases and completely recrystallized fabrics yield good results. As in the Alpine test case, polyhalite may characteristically serve as a geochronometer for diagenetic and very-low-grade metamorphic processes.

show abstract

Polyhalite and its analogous triple salts

Cited by 23 publications

References 10 publications

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Origin of deformed halite hopper crystals, pseudomorphic anhydrite cubes and polyhalite in Alpine evaporites (Austria, Germany)

⁴⁰ Ar/ ³⁹ Ar ages of crystallization and recrystallization of rock-forming polyhalite in Alpine rocksalt deposits

Contact Info

Product

Resources

About

Polyhalite and its analogous triple salts

Cited by 23 publications

References 10 publications

Solubility of Gypsum in MSO4 Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Solubility of Gypsum in MSO4 Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Origin of deformed halite hopper crystals, pseudomorphic anhydrite cubes and polyhalite in Alpine evaporites (Austria, Germany)

40 Ar/ 39 Ar ages of crystallization and recrystallization of rock-forming polyhalite in Alpine rocksalt deposits

Contact Info

Product

Resources

About

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

⁴⁰ Ar/ ³⁹ Ar ages of crystallization and recrystallization of rock-forming polyhalite in Alpine rocksalt deposits