RECORD IN METAMORPHIC TOURMALINES OF SUBDUCTION-ZONE DEVOLATILIZATION AND BORON CYCLING
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dc.contributor.author | Bebout G.E. | |
dc.contributor.author | Nakamura E. | |
dc.date.accessioned | 2021-12-18T07:26:49Z | |
dc.date.available | 2021-12-18T07:26:49Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=32158749 | |
dc.identifier.citation | Geology, 2003, 31, 5, 407-410 | |
dc.identifier.issn | 0091-7613 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33589 | |
dc.description.abstract | Boron concentrations and isotope compositions of fluids and lavas from subduction-zone settings show great potential for elucidating mass flux at Earth's modern convergent margins. However, the fluid-mineral-melt behavior of B and its two stable isotopes remains relatively poorly understood. Boron isotope analyses of tourmaline in metasedimentary rocks subducted to 15-90 km depths (1) demonstrate the ability of this mineral to retain information regarding prograde devolatilization history in even highly retrograded rocks and (2) indicate the importance of tourmaline in affecting whole-rock B loss and B isotope evolution during subduction-zone metamorphism. The B lost from micas during metamorphism of subducting sedimentary rocks and altered oceanic crust is isotopically more enriched in 11B than the B retained in the micas. Beneath forearcs and volcanic arcs, the B from micas is either removed from the subduction-zone rocks via metamorphic fluids or sequestered by growing tourmaline, in which the B can be entrained to even greater depths. Here we demonstrate that these metamorphic fluids could contribute to the relatively high δ11B signatures observed in most arc lavas and the across-arc trends of decreasing δ11B observed in several arcs. | |
dc.subject | subduction zones | |
dc.subject | tourmaline | |
dc.subject | 11B/10B | |
dc.subject | secondary ion mass spectrometry | |
dc.subject | metamorphism | |
dc.title | RECORD IN METAMORPHIC TOURMALINES OF SUBDUCTION-ZONE DEVOLATILIZATION AND BORON CYCLING | |
dc.type | Статья |
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