ECLOGITE-FACIES VEIN SYSTEMS IN THE MARUN-KEU COMPLEX (POLAR URALS, RUSSIA): TEXTURAL, CHEMICAL AND THERMAL CONSTRAINTS FOR PATTERNS OF FLUID FLOW IN THE LOWER CRUST
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dc.contributor.author | Molina J.F. | |
dc.contributor.author | Poli S. | |
dc.contributor.author | Austrheim H. | |
dc.contributor.author | Glodny J. | |
dc.contributor.author | Rusin A. | |
dc.date.accessioned | 2022-03-24T08:31:13Z | |
dc.date.available | 2022-03-24T08:31:13Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13450795 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2004, 147, 4, 484-504 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36644 | |
dc.description.abstract | Metasomatic amphibole-eclogite sequences grew in selvages of quartz veins from the Marun-Keu complex (Polar Urals, Russia) during high-pressure metamorphism. Relicts of a pre-metasomatic eclogite-facies assemblage are present in the wallrock layers as irregular patches. Wallrock interstitial quartz trails lying at a high angle to reaction fronts provide evidence for grain-scale pore channelisation which may be produced by intergranular-fluid compositional gradients parallel to the quartz trails. Disequilibrium at vein-wallrock scale is inferred from wallrock mineral heterogeneity and from variable initial Sr isotope ratios in mineral separates. Mass-balance calculations between relicts and wallrock assemblages reveal chemical imbalances caused by open system-behaviour with two way mass-transfer. The vein-wallrock system registers a prograde history from 408–434C (relicts) to 526–668C (vein precipitates). Vein and metasomatic assemblages formed during a single fluid-rock interaction process, implying high heating rates (100C/Ma), which could result from heat advection by large-scale fluid circulation. | |
dc.title | ECLOGITE-FACIES VEIN SYSTEMS IN THE MARUN-KEU COMPLEX (POLAR URALS, RUSSIA): TEXTURAL, CHEMICAL AND THERMAL CONSTRAINTS FOR PATTERNS OF FLUID FLOW IN THE LOWER CRUST | |
dc.type | Статья |
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