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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Kalahari Desert (1)
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Southern Africa
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Namibia (1)
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Asia
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Krasnoyarsk Russian Federation
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United States
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oxygen
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vanadates (3)
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Primary terms
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Africa
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Kalahari Desert (1)
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Southern Africa
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Namibia (1)
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Asia
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Altai Mountains
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Gorny Altai (1)
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Altai Russian Federation
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Gorny Altai (1)
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Baikal region (1)
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Krasnoyarsk Russian Federation
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atmosphere (1)
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oxygen
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Paleozoic
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syngenite
Antofagastaite, Na 2 Ca(SO 4 ) 2 ·1.5H 2 O, a new mineral related to syngenite
Leonite [K 2 Mg(SO 4 ) 2 · 4 H 2 O], konyaite [Na 2 Mg(SO 4 ) 2 · 5 H 2 O] and syngenite [K 2 Ca(SO 4 ) 2 ·H 2 O] from Tausoare Cave, Rodnei Mts, Romania
A new occurrence of syngenite
Comparative data for antofagastaite and syngenite. Antofagastaite*...
Raman spectra of syngenite and native-sulfur solid phases in polyphase incl...
SEM picture with a close-up of sulfate crystals, gypsum, and syngenite. The...
Radiating crystals of syngenite.
(a) The layer of (CaØ 8 ) polyhedra and (SO 4 ) tetrahedra in gypsum; (b) t...
(a) The layer of (CaØ 8 ) polyhedra and (SO 4 ) tetrahedra in gypsum; (b) t...
Synthesis and characterization of K 2 Ca 5 (SO 4 ) 6 · H 2 O, the equivalent of görgeyite, a rare evaporite mineral
Powder infrared absorption spectra of ( a ) antofagastaite from the Coronel...
SEM picture of a neoformed prismatic or needle-like forms of Ca-oxalate and...
Abundant lath-shaped to acicular crystals of antofagastaite on massive syng...
Infrared and Raman spectra of görgeyite 2b-HT in comparison to the infrare...
Medvedevite, KMn 2+ V 5+ 2 O 6 Cl⋅2H 2 O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia
Medieval stained glass in a Mediterranean climate: Typology, weathering and glass decay, and associated biomineralization processes and products
Sulphur isotopic composition of K–Mg sulphates of the Miocene evaporites of the Carpathian Foredeep, Ukraine
Abstract Miocene evaporites of the Carpathian Foredeep host an interesting sulphates group of potash deposits, including about 20 sulphates minerals. The study of sulphur isotopic composition of 10 of the sulphates minerals from the Kalush–Holyh and Stebnyk potash deposits shows that only the basal Ca-sulphates (anhydrite) from the Kalush–Holyn potash deposits has δ 34 S values typical of Neogene marine evaporites (+21.0‰). Potash minerals related to the deposits (polyhalite, anhydrite, kainite, langbeinite and kieserite) show δ 34 S values from +15.28‰ to +17.54‰, and the weathering zone minerals (picromerite, leonite, bloedite, syngenite and gypsum) show values ranging from +14.73‰ to +18.22‰. The recorded depletion of sulphur isotopic composition of the salt minerals of potash deposits (and their weathering zone) was probably caused by one or more of the following isotope fractionation factors: bacterial reduction of sulphate, effect of crystallization and inflow of surface waters containing sulphates enriched in light sulphur isotopes due to pyrite oxidation. Accordingly, the observed sulphur isotopic composition of minerals from these potash deposits demonstrates the depletion of the original brines and continual inflow of new (concentrated) seawater. Similar sulphur isotopic composition of minerals from the potash deposits and their weathering zone points out that there was no significant sulphur isotope fractionation during weathering and in this case inflow of surface water has an insignificant influence on sulphur isotopic composition.