SURFACE COMPLEXATION CLUES TO DOLOMITE GROWTH
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dc.contributor.author | Brady P.V. | |
dc.contributor.author | Krumhansl J.L. | |
dc.contributor.author | Papenguth H.W. | |
dc.date.accessioned | 2020-11-23T10:53:31Z | |
dc.date.available | 2020-11-23T10:53:31Z | |
dc.date.issued | 1996 | |
dc.identifier | https://elibrary.ru/item.asp?id=491607 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1996, , 4, 727-731 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/19396 | |
dc.description.abstract | Calcium and magnesium adsorb in near-stoichiometric proportions to dolomite over wide ranges in [Ca2+]2+], ionic strength, and solution composition pointing to minimal mixing of metal cations between the CaCO3 and MgCO3 layer edges exposed at the dolomite surface. Near-neutral pH Mg and Ca adsorb as hydrated ions, or, in sulfate-rich solutions, as metal sulfate complexes. Near-stoichiometric adsorption of Ca and Mg points to dehydration and subsequent carbonation of adsorbed Mg as the likely rate-limiting step for dolomite growth at near-Earth surface conditions. We propose that one path for dolomite growth from low-temperature natural waters is through the initial adsorption of Mg-sulfate complexes onto either (1) growing dolomite crystals or (2) rate-limiting dolomite nucleii. Field relations, as well as homogeneous syntheses at low temperatures (25°C < T < 100°C) support this hypothesis and provide a mechanistic explanation for dolomite growth from sulfate-rich natural waters. | |
dc.title | SURFACE COMPLEXATION CLUES TO DOLOMITE GROWTH | |
dc.type | Статья |
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