publication . Article . 2011

nitrogen isotopes in ophiolitic metagabbros a re evaluation of modern nitrogen fluxes in subduction zones and implication for the early earth atmosphere

Vincent Busigny; Pierre Cartigny; Pascal Philippot;
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  • Published: 14 Oct 2011 Journal: Geochimica et Cosmochimica Acta, volume 75, pages 7,502-7,521 (issn: 0016-7037, Copyright policy)
  • Publisher: Elsevier BV
Abstract
Nitrogen contents and isotope compositions together with major and trace element concentrations were determined in a sequence of metagabbros from the western Alps (Europe) in order to constrain the evolution and behavior of N during hydrothermal alteration on the seafloor and progressive dehydration during subduction in a cold slab environment (8 C/km). The rocks investigated include: (i) low-strain metagabbros that equilibrated under greenschist to amphibolite facies (Chenaillet Massif), blueschist facies (Queyras region) and eclogite facies (Monviso massif) conditions and (ii) highly-strained mylonites and associated eclogitic veins from the Monviso Massif. In...
Subjects
free text keywords: Geochemistry and Petrology, Metamorphic facies, Mantle (geology), Geology, Geochemistry, Subduction, Massif, geography.geographical_feature_category, geography, Subduction zone metamorphism, Volcanic arc, Greenschist, Blueschist
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