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  4. Mass transfers during fluid-rock interactions at divergent and convergent plate boundaries
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-00107083-13

Mass transfers during fluid-rock interactions at divergent and convergent plate boundaries

Veröffentlichungsdatum
2019-02-04
Autoren
Albers, Elmar  
Betreuer
Bach, Wolfgang  
Gutachter
John, Timm  
Zusammenfassung
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.
Schlagwörter
Geosciences

; 

Metamorphic geology

; 

Fluid-rock interactions

; 

Mid-ocean ridges

; 

Subduction zones
Institution
Universität Bremen  
Fachbereich
Fachbereich 05: Geowissenschaften (FB 05)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

00107083-1.pdf

Size

25.97 MB

Format

Adobe PDF

Checksum

(MD5):9c41494aac14b2482edd18b158e3f4eb

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