Mass transfers during fluid-rock interactions at divergent and convergent plate boundaries
|Other Titles:||Massentransfers während Fluid-Gesteins-Wechselwirkungen an divergenten und konvergenten Plattengrenzen||Authors:||Albers, Elmar||Supervisor:||Bach, Wolfgang||1. Expert:||Bach, Wolfgang||2. Expert:||John, Timm||Abstract:||
Fluids and reactions between fluids and rock evoke significant mass and energy transfers in the marine realm. Phyllosilicate-rich shear zone rocks from a detachment fault zone (Mid-Atlantic Ridge) formed by hydrothermal alteration of hybrid ultramafica mafic rocks. Extensional strain and deformation focus in these weak lithologies and initiate a feedback loop between hydration and strain localization, which likely play a key role in detachment faults worldwide. Carbonates, precipitated from CO2-rich, oxidizing fluids, have formed in veins in metavolcanic and -sedimentary clasts at depths <20 km within the subduction channel (Mariana subduction system). Their existence proofs of C mobilization from the slab at shallow portions of subduction zones. Serpentinites from the basal plane of the mantle wedge (Mariana subduction zone) contain high contents of fluid-mobile elements (Li, B, Sr, Rb, Cs, Ba) that were mobilized during dehydration of the slab. Element concentrations vary with slab-depths and the sources of the serpentinization fluids, and provide a continuous record of slab dehydration reactions.
|Keywords:||Geosciences, Metamorphic geology, Fluid-rock interactions, Mid-ocean ridges, Subduction zones||Issue Date:||4-Feb-2019||URN:||urn:nbn:de:gbv:46-00107083-13||Institution:||Universität Bremen||Faculty:||FB5 Geowissenschaften|
|Appears in Collections:||Dissertationen|
checked on Sep 19, 2020
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