...S.V. Michurin; R.F. Abdrakhmanov; V.N. Durnaeva; V.F. Yuldashbaeva The geochemical and mineralogical features of gypsum of the Kungurian Stage in the southern Cis-Urals have been studied. Elevated contents of Sr (up to 1.6 wt.%) were detected, and its sedimentary genesis has been established...

...Janice L. Bishop; Peter Schiffman; Enver Murad; Randal J. Southard; Lukas Gruendler; M. Darby Dyar; Melissa D. Lane Abstract Solfataric alteration at the South Sulfur Bank of the former Kilauea caldera produced opal, Mg- and Fe-rich smectites, gypsum, and jarosite through silica replacement...

... in height, subdivide them into smaller cells ~1 km in diameter. The ridges were up to ~40% higher before the alteration of gypsum to anhydrite. Both seismic and gravity surveys indicate the presence of similar structures over an area of thousands of square kilometers. Two alternative hypotheses, gypsum...

...) analyses of the Oligocene non-marine succession of St-Geniez (Digne region, France). Oligocene salt influences are highlighted by (1) high Sr concentrations (>1000 ppm) in most of the series, (2) the occurrence of halophytic gastropods and (3) the deposition of two gypsum beds. The 87 Sr/ 86 Sr ratios...

... as aggregates, gypsum and white powder as cementing materials, and mica flakes as materials for the laminated strata. The composition scheme of the different materials was determined according to the similarity criterion ( Table 2 ). The complete physical model is shown in Figure 7(a) . Figure 7...

... of crushed rock backfill, during construction, operation and closure, relies on optimizing its mechanical properties. This paper explores how density and composition influence the strength of (i) crushed halite and (ii) crushed gypsum–mudstone mixtures of the Triassic Mercia Mudstone Group, which...

... of gypsum, also points to interactions between silica-laden groundwater and carbonate host rocks during cold periods. In parallel, the distribution and micromorphology of silicifications in associated Tertiary limestone formations suggests that they formed during cold climates in the Quaternary...

... to statistics, nearly 50% of drilling accidents occur in composite salt formations. The composite salt formation is mainly composed of salt, gypsum, and interbed mud, and the lithology is complex and changeable. Therefore, it is very important to study the deformation mechanism and leading influencing factors...

... by modifying the modelled gypsum fluxes via the incorporation of evaporite data from the geological record. We found that forcing gypsum burial with the observed evaporite deposition data causes the model to better match proxy records at some times, but worsens predictions at others. We also investigated...

...Paul L. Broughton Abstract The stromatolite tufa mound at La Saline Lake developed along the Athabasca River Valley in northeast Alberta consists of a 30 m-high structure with a multi-meter thick caprock of stratified gypsum. The gypsum caprock developed when the meteoric-charged groundwater...

... of antarcticite (CaCl 2 ·6H 2 O) ( Torii et al. 1977 ) and gypsum (CaSO 4 ·2H 2 O), as well as elevated halite (NaCl) that leave a “bathtub ring” of salt encrustation around the perimeter ( Oberts 1973 ). Aqueous processes and the brine chemistry depend on the regional water system and several schools of thought...

... consistent maintenance to prevent structural issues, even though they experience lower traffic. Traditionally, gypsum has been used for soil stabilization due to its cation exchange capability with clay minerals and flocculation properties. However, its water solubility in wet conditions necessitates...

... in mineral slits must be understood. Here, we simulate the molecular dynamics and displacement efficiency of CH 4 in gypsum, quartz, and illite mineral slit models. The results demonstrate that gas density is not uniform throughout the slits and prove that gypsum and quartz have a greater adsorption capacity...

... dynamics simulations. The simulation results revealed that (1) CO 2 occurrence in gypsum slit pores is stable, with the distribution involving two adsorption layers. The CO 2 occurrence in calcite slit pores stabilizes after 250 ps, involving two adsorption layers adjacent to the walls of the slit...

... authigenic mineral formation took place in the lake basin; gypsum, halite and carbonates of calcite-dolomite series dominate among the newly formed mineral phases. Mg-calcites with different Mg contents, excess-Ca dolomites, aragonite and occasionally Mg-siderite have been found in the assemblage...

...Karena K. Gill; Elliot A. Jagniecki; Kathleen C. Benison; Martha E. Gibson Abstract Various sulfate minerals exist on Mars; except for gypsum, they are understudied on Earth. Extremophiles have been documented in modern gypsum and halite and ancient halite, but other chemical sediments have...

...James W. Hagadorn; Antoine Bercovici; R. Farley Fleming; Karen R. Whiteley; Michael R. Yusas; Tyler R. Lyson; Charles M. Henderson ABSTRACT The first reported Permian (Kungurian to Roadian) palynomorphs are described from Colorado, recovered from bedded gypsum and rare organic-rich shale...

...Curtis R. Klug Abstract A method for the relatively fast, inexpensive, and safe dissolution of rock gypsum and rock anhydrite for the recovery of palynomorphs is described. Rock gypsum and rock anhydrite deposits are widely distributed geographically and throughout the geologic column...

..., notably in the outer alteration envelope (smectite zone), and was likely deposited during the calcite event. Translucent gypsum and rare prismatic, pale-blue euhedral celestine may fill the central cavity in main-stage banded quartz veins. However, most gypsum in the Kupol district occurs as swarms...

... (DRIFT) spectroscopy and X-ray diffraction (XRD) on 10 samples of cave sulfate minerals reveal, in order of decreasing abundance: Gypsum (CaSO 4 ·2H 2 O), forming decimeter-thick saccharoidal crusts on cave walls ( Fig. 2C ); centimeter-long efflorescences along small fissures, styloliths...