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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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North Africa
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Egypt (2)
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Asia
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Atlantic Ocean
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Primary terms
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Africa
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Asia
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Middle East (1)
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Atlantic Ocean
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Mid-Atlantic Ridge
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Australia
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sedimentary structures
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sedimentary structures
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sediments
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siliciclastics (1)
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soils
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soils (2)
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calcium sulfate
Evaporite weathering and deposition as a long-term climate forcing mechanism
Reaction pathways and textural aspects of the replacement of anhydrite by calcite at 25 °C
Location and stability of europium in calcium sulfate and its relevance to rare earth recovery from phosphogypsum waste
Images from Curiosity: A New Look at Mars
ChemCam: Chemostratigraphy by the First Mars Microprobe
Determining Mineralogy on Mars with the CheMin X-Ray Diffractometer
Spectral properties of Ca-sulfates: Gypsum, bassanite, and anhydrite
The crystal structure of gypsum-II determined by single-crystal synchrotron X-ray diffraction data
Sulfur on Mars
Thermal behaviour and kinetics of dehydration in air of bassanite, calcium sulphate hemihydrate (CaSO 4 ·0.5H 2 O), from X-ray powder diffraction
A comparison of Khuff and Arab reservoir potential throughout the Middle East
Pseudomorphs after evaporitic minerals interbedded with 2.2 Ga stromatolites of the Yerrida basin, Western Australia: Origin and significance
Study of particle fluxes in the Broken Spur hydrothermal vent field (29 degrees N, Mid-Atlantic Ridge)
Fibrous Calcium Sulfate in Veins: ABSTRACT
Relationships of modern gypsum nodules in sabkhas of loess to compositions of brines and sediments in northern Egypt
Major-element geochemistry of brines from the Wind tidal flat area, Laguna Madre, Texas
Primary gypsum nodules in a modern sabkha on the Mediterranean coast of Egypt
Abstract The permanence of concrete in engineering structures is jeopardized where highalkali portland cement is used with aggregates containing opal, chalcedony, tridymite, intermediate to acidic volcanic rocks, or some phyllites. First recognized in 1938, deterioration caused by cement-aggregate reaction is characterized by cracking, expansion, and decline in strength and elasticity of the concrete. Petrographic and petrologic methods have contributed significantly to the investigation of cement-aggregate reaction. Microscopic criteria serve to distinguish between this and other types of deterioration. Petrographic examination of concrete aggregates can be used to predict their potential reactivity. Physical-chemical conditions contributing to the deterioration were explored by petrologic and geochemical methods. The mechanism by which reaction between rocks and minerals and the alkalies of cement causes this destruction is explained. Essentially i t consists of osmotic pressures produced by the formation and hydration of alkalic silica gels, which arise from interaction of alkalies and certain aggregates.