نتایج جستجو برای: basal anhydrite
تعداد نتایج: 97772 فیلتر نتایج به سال:
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...
The stable-isotope geochemistry of sulfate minerals that form principally in I-type igneous rocks and in the various related hydrothermal systems that develop from their magmas and evolved fluids is reviewed with respect to the degree of approach to isotope equilibrium between minerals and their parental aqueous species. Examples illustrate classical stable-isotope systematics and principles of...
Calcite cement is a common diagenetic mineral in carbonate rocks and plays an important role on rock quality as hydrocarbon reservoirs. Traditionally, oxygen isotopic compositions (δ 18 O) of the calcites tend to decrease with increasing depths due temperature-dependent isotope fractionation. In this study, stable calcite cements Changxing Feixianguan formations from Puguang, Yuanba, Jiannan Fu...
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