87Sr/86Sr age determination by rapidly formed spherical carbonate concretions
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چکیده
منابع مشابه
Calcium carbonate concretions formed by the decomposition of organic matter.
Bacterial decomposition of butterfish and smelts in small sealed jars containing seawater and other solutions, for periods ranging from 65 to 205 days, results in a large increase in concentrations of dissolved bicarbonate, carbonate, and ammonia (plus volatile amines). Accompanying this is a rise in pH and the precipitation of Ca(++) ion from solution. The Ca(++) is not precipitated as CaCO(3)...
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Carbonate concretions occur in sedimentary rocks of widely varying geological ages throughout the world. Many of these concretions are isolated spheres, centered on fossils. The formation of such concretions has been variously explained by diffusion of inorganic carbon and organic matter in buried marine sediments. However, details of the syn-depositional chemical processes by which the isolate...
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The carbonate phase of impure sideritic concretions from a sequence of argillaceous sediments from the Westphalian of Yorkshire has been analysed using an acid-dissolution technique and corrections allowing for the decomposition of non-carbonate minerals applied to obtain accurate compositional formulae. The siderites show considerable compositional variation, some containing Ca in excess of an...
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Lattice parameters have been determined for two coexisting siderite phases in concretions of Westphalian age. Chemical evidence indicates that, for one concretion at least, the phase of smaller cell dimensions is a magnesian siderite with around 25 mole % MgCOa. Both abundances and compositions of the two phases vary between concretions whilst a single phase only is present in disseminated side...
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AND MONTERDE, NORTHEAST SPAIN: AN ANALOGUE AQUEOUS ORIGIN Alberto G. Fairén, Ricardo Amils, Fernando Leandro, James M. Dohm, Dirk SchulzeMakuch, and Alexis P. Rodríguez. Centro de Biología Molecular, Universidad Autónoma de Madrid, 28049-Cantoblanco, Madrid, Spain. [email protected], Centro de Astrobiología (CSIC–INTA). 28850-Torrejón de Ardoz, Madrid. Spain, Facultad de Geología, Universidad...
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ژورنال
عنوان ژورنال: Scientific Reports
سال: 2019
ISSN: 2045-2322
DOI: 10.1038/s41598-019-38593-9