Lehrstuhl für Endogene Geodynamik (Prof. Dr. Haase)
Ophiolites – Insights into mantle melting and subduction zone processes
Subduction zone magmas – Aegean Arc
Ophiolites are assemblages of submarine basaltic volcanic rocks, underlain by sheeted dyke complex, gabbroic and ultramafic cumulates, which in turn are underlain by depleted upper mantle peridotites. Ophiolites are generally considered to be fragments of oceanic crust and upper mantle emplaced on land, and potentially give insights into the volcanic structure and mode of formation of the oceanic crust.
The presence of a sheeted dyke complex and the enrichment in fluid-mobile elements in volcanic rocks of the Troodos ophiolite indicates a formation at a spreading centre in the vicinity of a subduction zone. So-called supra-subduction zone ophiolites. Thus, Cyprus provides an exceptional natural laboratory to investigate the influence of both processes. The occurrence of fresh volcanic glass and the use of microanalytical measurement methods allows us to avoid the effects of extensive seafloor alteration processes.
We will carry out major and trace element and Sr-Nd-Pb-Hf isotope measurements of fresh volcanic glasses from different sections to get a “three-dimensional” geochemical model of the extrusive series of the Troodos ophiolite. This dataset will place new constraints on tectonic models for the origin of supra-subduction zone ophiolites.
Mineral- and glass composition by electron microprobe analysis, LA-ICP-MS.
Oxygen isotope composition and radiogenic isotopes by Laser-fluorination and MC-ICP-MS.
Oxygen isotope and trace element compositions of platiniferous dunite pipes of the Bushveld Complex, South Africa – Signals from a recycled mantle component?
In: Lithos 310-311 (2018), S. 332-341
, , , , , :
Evolution and genesis of calc-alkaline magmas at the Paphsanias Volcanic Field, Aegean Arc
GeoBonn2018 (Bonn, 09/02/18 - 09/06/18)
, , , , :
Evidence for melting of subducting carbonate-rich sediments in the western Aegean Arc
In: Chemical Geology (2018)
, , , , , , :
Petrogenesis of boninitic lavas from the Troodos Ophiolite, and comparison with Izu–Bonin–Mariana fore-arc crust
In: Earth and Planetary Science Letters (2018)
, , , , :
The origin of evolved volcanic rocks in Methana, Greece
Goldschmidt 2017 (Palais des Congrès de Paris 2 Place de la Porte Maillot, 75017 Paris, France, 08/13/17 - 08/18/17)
, , , :
Geodynamic constraints from glass geochemistry in the Troodos ophiolite
GeoBremen2017 (Bremen, 09/24/17 - 11/29/17)
, , , :
The geochemical stratigraphy of lavas from the Troodos Ophiolite
Goldschmidt 2017 Paris (Palais des Congrès de Paris 2 Place de la Porte Maillot, 75017 Paris, France, 08/13/17 - 11/18/17)
, , , :