PRECISE ECLOGITIZATION AGES DEDUCED FROM RB/SR MINERAL SYSTEMATICS: THE MAKSYUTOV COMPLEX, SOUTHERN URALS, RUSSIA
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dc.contributor.author | Glodny J. | |
dc.contributor.author | Bingen B. | |
dc.contributor.author | Austrheim H. | |
dc.contributor.author | Molina J.F. | |
dc.contributor.author | Rusin A. | |
dc.date.accessioned | 2021-09-21T01:06:23Z | |
dc.date.available | 2021-09-21T01:06:23Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=13390343 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2002, 66, 7, 1221-1235 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30353 | |
dc.description.abstract | The Maksyutov complex (Southern Urals, Russia) is a well-preserved example of subduction-related high-pressure metamorphism. One of its two litho-tectonic units consists of rocks that experienced eclogite-facies conditions. Published 40Ar/39Ar data on phengite, U/Pb data on rutile, and Sm/Nd mineral data define a cluster of ages around 370 to 380 Ma. Nevertheless, no consensus exists as to the detailed interpretation of data and the exact age of eclogitization. We present new, high-precision internal mineral Rb/Sr isochrons for eclogite-facies metabasites, felsic eclogites, and eclogite-facies quartz veins. Nine isochrons, mainly controlled by omphacite and white mica phases, give concordant ages with an average value of 375 ± 2 Ma (2σ). Microtextural features, such as prograde growth zoning in eclogite-facies phases, suggest that the assemblages dated formed at a stage of prograde metamorphism. Sr-isotopic equilibria among eclogite-facies phases, and among eclogite-facies fluid veins and the host rocks, indicate that our ages reflect crystallization ages, related to the prograde-metamorphic, probably fluid-mediated eclogitization reactions. This interpretation is reinforced by data from fluid-precipitated quartzitic eclogites, whose modal composition, together with intergrowth relationships, conclusively imply closed-system behavior after crystallization. The possible occurrence of a pre-375 Ma event of ultra-high-pressure metamorphism (UHPM) in the Maksyutov complex is disproved by isotope systematics, microtextures, and mineral zoning patterns. | |
dc.title | PRECISE ECLOGITIZATION AGES DEDUCED FROM RB/SR MINERAL SYSTEMATICS: THE MAKSYUTOV COMPLEX, SOUTHERN URALS, RUSSIA | |
dc.type | Статья |
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