نتایج جستجو برای: evaporites
تعداد نتایج: 253 فیلتر نتایج به سال:
Abstract. In Europe, formation of the Palaeozoic Variscan orogenic belt, and Mesozoic–Cenozoic Alpine–Carpathian belt led to a widespread inversion events within forelands both domains. We used legacy 2-D seismic data together with newly acquired 3-D that, for first time, precisely imaged sub-Zechstein (i.e. sub-evaporitic) upper successions in NW Poland order develop quantitative, balanced mod...
We use 3D seismic reflection data from the Levant margin, offshore Lebanon to investigate structural evolution of Messinian evaporite sequence, and how intra-salt structure strain varies within a thick salt sheet during early-stage tectonics. Intra-Messinian reflectivity reveals lithological heterogeneity otherwise halite-dominated sequence. This leads rheological heterogeneity, with different ...
Geochemical models of secondary mineral precipitation on Mars generally assume semiopen systems (open to the atmosphere but closed at the water-sediment interface) and equilibrium conditions. However, in natural multicomponent systems, the reactive surface area of primary minerals controls the dissolution rate and affects the precipitation sequences of secondary phases, and simultaneously, the ...
The debate of life on Mars centers around the source of the globular, micrometer-sized mineral carbonates in the ALH84001 meteorite; consequently, the identification of Martian processes that form carbonates is critical. This paper reports a previously undescribed carbonate formation process that occurs on Earth and, likely, on Mars. We identified micrometer-sized carbonates in terrestrial aero...
The image of the colonisation of the land by plants as a spectacular event, when barren wastes suddenly became verdant triggered by a change in some extrinsic environmental factor, is fading. It derived from the appearance and rapid diversification of vascular plants, unequivocal land colonisers, and, almost simultaneously, the earliest terrestrial arthropods, in the late Silurian and early Dev...
Distinct parts of limestones within the upper Paleozoic Auernig Group of the Carnic Alps, Austria and Italy, are characteristic of cool-water carbonates. The Carnic Alps were between 5 N and 10 S paleolatitude during the late Carboniferous, a position confirmed by dasyclad algae and fossil plants. The floral association, occurrence of coal seams, and absence of evaporites indicate a humid tropi...
Systematic patterns of detrital K-feldspar decline with increasing burial depth are revealed during deep burial (1.5–4.5 km) of sandstones in diverse sedimentary basins from three rift and two passive margin settings in the North Sea and USA Gulf Coast. K-feldspar destruction is predominantly by dissolution, though in-situ alteration to albite also occurs. Dissolution can remove up to 15% solid...
Pleistocene to present evaporitic lacustrine sediments in Lake Magadi, East African Rift Valley, Kenya were studied and mapped using spectral remote sensing methods. This approach incorporated surface mineral mapping using space-borne hyperspectral Hyperion imagery together with laboratory analysis, including visible, near-infrared diffuse reflectance spectroscopy (VNIR) measurements and X-ray ...
Abstract The Central Andes of South America host the largest known lithium resources in a confined area, but primary sources salar deposits and mobilisation process are still matter speculation. Chemical weathering at or near surface leaching hydrothermal systems active magmatic arc considered two main mechanisms Li extraction from source rock. strontium isotope composition typical offer insigh...
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