VOLATILE COMPONENTS, MAGMAS, AND CRITICAL FLUIDS IN UPWELLING MANTLE
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dc.contributor.author | Wyllie P.J. | |
dc.contributor.author | Ryabchikov I.D. | |
dc.date.accessioned | 2021-01-29T03:36:29Z | |
dc.date.available | 2021-01-29T03:36:29Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=13350805 | |
dc.identifier.citation | Journal of Petrology, 2000, 41, 7, 1195 | |
dc.identifier.issn | 0022-3530 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23914 | |
dc.description.abstract | The phase diagram for lherzolite-CO2-H2O provides a framework for interpreting the distribution of phase assemblages in the upper mantle with various thermal structures, in different tectonic settings. Experiments show that at depths >80 km, the near-solidus partial melts from lherzolite-CO2-H2O are dolomitic, changing through carbonate-silicate liquids with rising temperatures to mafic liquids; vapor, if it coexists, is aqueous. Experimental data from simple systems suggest that a critical end-point (K) occurs on the mantle solidus at an undetermined depth. Isobaric (T-X) phase diagrams for volatile-bearing systems with K elucidate the contrasting phase relationships for lherzolite-CO2-H2O at depths below and above a critical end-point, arbitrarily placed at 250 km. At levels deeper than K, lherzolite can exist with dolomitic melt, aqueous vapor, or with critical fluids varying continuously between these end-members. Analyses of fluids in microinclusions of fibrous diamonds reveal this same range of compositions, supporting the occurrence of a critical end-point. Other evidence from diamonds indicates that the minimum depth for this end-point is 125 km; maximum depth is not constrained. Constructed cross-sections showing diagrammatically the phase fields intersected by upwelling mantle indicate how rising trace melts may influence trace element concentrations within a mantle plume. | |
dc.title | VOLATILE COMPONENTS, MAGMAS, AND CRITICAL FLUIDS IN UPWELLING MANTLE | |
dc.type | Статья |
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