CONTINUOUS SOLID-SOLUTION BETWEEN MERCURIAN GIRAUDITE AND HAKITE
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dc.contributor.author | Förster H.-J. | |
dc.contributor.author | Rhede D. | |
dc.contributor.author | Tischendorf G. | |
dc.date.accessioned | 2021-06-30T03:48:50Z | |
dc.date.available | 2021-06-30T03:48:50Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=36252586 | |
dc.identifier.citation | The Canadian Mineralogist, 2002, 40, 4, 1161-1170 | |
dc.identifier.issn | 0008-4476 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/29460 | |
dc.description.abstract | Among the minerals of the selenide assemblage at the Niederschlema-Alberoda uranium deposit, Erzgebirge, Germany, members of the mercurian giraudite-hakite solid solution intergrown with berzelianite and galena have been identified as rare and previously unknown phases. They form complexly zoned, anhedral, minute (<350 mu m) grains embedded in a dolomite matrix. Compositional variability is expressed by the following crystallochemical formula (calculated on the basis of 29 atoms per formula unit): (Cu-9.92-Ag0.01-0.08)(Sigma 10.00) (Hg0.92-1.81Cu0.06-1.12Zn0.05-0.10Fe0.00-0.15)(Sigma 1.98-2.06) (As0.69-3.98Sb0.02-3.29)(Sigma 3.91-4.08) (Se10.47-11.53S1.47-2.61)(Sigma 12.90-13.09). The solid solutions span the range from gir(99.5)hak(0.5) to gir(16.2)hak(83.8), suggesting complete miscibility between mercurian giraudite and mercurian hakite in nature, equivalent to what already has been established for their S-bearing analogues, tennantite and tetrahedrite. The lack of thermodynamic data for both Se-rich species limits reliable inferences on the P-T-X conditions that prevailed during their formation. The assemblage mercurian giraudite-hakite + berzelianite + galena may represent a short-term equilibrium paragenesis of Jurassic age, formed at temperatures between 110 and 150 degrees C under the conditions of low Se and S activities (i.e., -26 < logf(Se-2) < -31 and -24 < logf(S-2) < -28 at similar to 110 degrees C), before the bulk of the selenide minerals crystallized. A second, less likely hypothesis calls upon the formation of the mercurian giraudite-hakite solid solutions during an early Cretaceous event, when pre-existing selenide minerals (berzelianite) were partially attacked by infiltrating fluids that introduced the major portion of the As and Sb into the system. | |
dc.subject | giraudite | |
dc.subject | hakite | |
dc.subject | mercury | |
dc.subject | selenium minerals | |
dc.subject | solid solution | |
dc.subject | miscibility | |
dc.subject | uranium deposit | |
dc.subject | Schlema–Alberoda | |
dc.subject | Erzgebirge | |
dc.subject | Germany | |
dc.title | CONTINUOUS SOLID-SOLUTION BETWEEN MERCURIAN GIRAUDITE AND HAKITE | |
dc.type | Статья |
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