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Andesite --- Andesite --- Andesite --- Geology, Stratigraphic --- From 25 to 40 million years ago --- Colorado --- Colorado --- Colorado

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Geology, Stratigraphic --- Weathering --- Andesite --- Basalt --- Andesite. --- Basalt. --- Geology, Stratigraphic. --- Quaternary Geologic Period. --- Weathering. --- From 2 million years ago --- United States, West.

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Andesite. --- Plate tectonics. --- Andesite --- Plate tectonics --- PETROLOGIE ROCHES IGNEES --- GENESE --- ROCHES IGNEES BASIQUES, ULTRA-BASIQUES --- TECTONIQUE --- STRUCTURE D'ENSEMBLE --- RELATION TECTONIQUE ET AUTRES PHENOMENES --- GEOPHYSIQUE --- GEODYNAMIQUE --- ISOSTASIE, DERIVE DES CONTINENTS, PLAQUES...

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L’île de Panarea fait partie d’un large complexe volcanique qui s’est principalement développé entre 155 et 118 ka. Les protolithes sélectionnés sont de compositions andésitiques à dacitiques et issus des séries calco-alcalines riches en potassium. Les phases minérales majeures sont le plagioclase, le clinopyroxène, l’orthopyroxène, l’olivine et l’amphibole. Les textures sont porphyriques et gloméropophyriques. Les protolithes montrent un comportement d’arc volcanique avec un enrichissement en LILE (Large Ion Lithophile Elements) par rapport aux HFSE (High Field Strength Elements). Une forte activité hydrothermale touche ces roches, produisant des néoformations sous forme de séquences paragénétiques : (1) des veines de sulfures et sulfates massifs (marcassite-silice-alunite-baryte-gypse-halite), (2) des précipitations d’alunite et de kaolinite (alunite-silice-kaolinite-montmorillonite) et (3) des veines de sulfures et sulfates oxydées (silice-hématite-goethite-alunite-kaolinite-montmorillonite-gypse), soumises à l’altération supergène. Les profils d’altération montrent un enrichissement global en LILE/HFSE, indiquant une altération de surface, et le lessivage de certains éléments (Dy, Y, Yb, Lu). Un schéma d’altération est présenté pour les différentes paragenèses.

Volcanisme, altération hydrothermale acide, andésite, alunite, kaolinite, sulfure, sulfate, Îles Éoliennes, Panarea, altération supergène --- Physique, chimie, mathématiques & sciences de la terre > Sciences de la terre & géographie physique

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An ever-increasing concern over environmental degradation, together with recent technological advances, has spawned an explosion of chemical data for a wide variety of matter found on earth and in the solar system. Yuan-Hui Li's book offers professionals and students alike an indispensable up-to-date guide to geochemistry, bringing together new information on topics ranging from nucleosynthesis to crystal chemistry, from the systematics of chemical variation in the earth's core to the composition of complex organics. The objective is to illustrate the physicochemical principles and various natural processes that can explain observed compositional changes in natural substances. A general understanding of these principles and processes (including those pertaining to cosmology, geology, and biology) is essential, maintains the author, for deciphering and predicting transport pathways and final sinks of anthropogenic pollutants in our environment. The book focuses on compositional data and related references for such substances as solar photosphere, meteorites, igneous rocks, soils, sedimentary rocks, surficial waters, marine and terrestrial organisms (including humans), and aerosols. It emphasizes the use of original raw data as much as possible, and applies the statistical technique of factor analysis to elucidate any underlying interrelationships among chemical elements and given sample sets. Whenever applicable, simple chemical thermodynamic models are introduced to explain the observed partitioning of elements among different phases.

Geochemistry. --- Achondrites. --- Acid dissociation constant. --- Aerosols, Arctic and Antarctic. --- Affinity of aqueous cation to oxide. --- Albedo of celestial bodies. --- Allende mixing line. --- Amoeboid olivine rich inclusion (AOI). --- Atomic mass units (amu). --- Big Bang theory. --- Biologically mediated reduction. --- Biophile and biophobe elements. --- Black body radiation. --- Black shale. --- Calcium aluminum rich inclusions (CAI). --- Carbon burning in stars. --- Carbonaceous chondrites. --- Chemical weathering. --- Chondrules. --- Comets. --- Compatible and incompatible elements. --- Cumulative ionization energy. --- Dry and wet precipitations. --- Eccentricity. --- Eigenvalues. --- Explosive nucleosynthesis. --- Factor analysis. --- Fecal pellets. --- Fractionation factor. --- Galactic clusters. --- Glacial till. --- Grand unified theories. --- Helium core flash. --- Hemipelagic mud. --- Human body. --- Hydrogen burning in stars. --- Ionic potential. --- Ionic radii. --- Island arc andesite. --- Jupiter family of comets. --- Kirkwood gaps. --- Komatiite. --- Kuiper belt. --- Magic numbers of nuclides. --- Main sequence stars. --- Mica schist. --- Neutron star. --- Normalized planetary masses. --- Oxidative uptake. --- Oxygen burning in stars. --- Perihelion. --- Periodic table. --- crude oil. --- evaporites. --- hemipelagic mud.