نتایج جستجو برای: anhydrite
تعداد نتایج: 404 فیلتر نتایج به سال:
MIL03346 meteorite: It is a martian meteorite (nakhlite) collected from Miller Range, Antarctica. It contains variety of hydrous Caand Fe 3+ -sulfates, and other H2O/OH-bearing species, thus has been extensively studied, with a purpose to build the links to aqueous alteration processes on Mars [4-9]. The martian origin of Ca-sulfates and jarosites in MIL 03346 is validated by the finding of the...
ABSTRACT: Extreme swelling pressures (in excess of 5 MPa) were measured against the invert of a tunnel excavated by drill and blast method in a hard claystone containing variable proportions of anhydrite and gypsum dispersed in the clay matrix. When the invert was not present, floor heave reached displacements in excess of 60 cm in some cross sections. Displacements and pressures developed at a...
Abstract Climate models for Venus rely heavily on theoretical modeling and laboratory experimentation due to the extreme surface conditions of planet limited in situ data. To better explore relative importance reactions between atmosphere Venus, we exposed representative volcanic glasses basaltic minerals a large‐scale simulation with realistic atmospheric composition. This study consistend two...
Introduction: Akaganeite (β-FeOOH) is an Fe(III) (hydr)oxide with a tunnel structure usually occupied by chloride. Akaganeite has been recently discovered in a mudstone on the surface of Mars by the Chemistry and Mineralogy (CheMin) and Sample Analysis at Mars (SAM) instruments onboard the Mars Science Laboratory (MSL) Curiosity Rover in Gale crater [1, 2]. Akaganeite was detected together with...
In the context of the study of the wet creep of plasterboards, we have performed digital holographic interferometry measurements of the dissolution of gypsum of various quarries in water and in aqueous solutions of salts inhibiting dissolution, and of the dissolution of anhydrite in water. This technique is carried out in still water and permits to observe directly the reacting solid-liquid int...
The Mars Science Laboratory rover Curiosity scooped samples of soil from the Rocknest aeolian bedform in Gale crater. Analysis of the soil with the Chemistry and Mineralogy (CheMin) x-ray diffraction (XRD) instrument revealed plagioclase (~An57), forsteritic olivine (~Fo62), augite, and pigeonite, with minor K-feldspar, magnetite, quartz, anhydrite, hematite, and ilmenite. The minor phases are ...
Kieserite on Mars: The hydrous Mg-sulfate that has been identified definitively on Mars by OMEGA (Mars Express orbiter) is kieserite (MgSO4·H2O) [1]. An additional class of OMEGA spectra has been attributed to “polyhydrated sulfate.” This class has spectral features that match Mg-sulfates of higher hydration or multi-cation sulfates [2,3]. Ca-sulfates, especially gypsum (CaSO4·2H2O), are also i...
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