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Jörg Hermann
University of Bern
232Publications
62H-index
11kCitations
Publications 240
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#1Qiang Liu (China University of Geosciences)
#2Jörg Hermann (ANU: Australian National University)H-Index: 62
Last.Junfeng Zhang (China University of Geosciences)
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#1F. Piccoli (University of Bern)
#2Jörg Hermann (University of Bern)H-Index: 62
Last.J. F. Vieira Duarte (University of Bern)
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The observation that primitive arc magmas are more oxidized than mid-ocean-ridge basalts has led to the paradigm that slab-derived fluids carry SO2 and CO2 that metasomatize and oxidize the sub-arc mantle wedge. We combine petrography and thermodynamic modelling to quantify the oxygen fugacity (fO2) and speciation of the fluids generated by serpentinite dehydration during subduction. Silicate-magnetite assemblages maintain fO2 conditions similar to the quartz-fayalite-magnetite (QFM) buffer at f...
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#1Michael C. Jollands (UNIL: University of Lausanne)H-Index: 6
#2Elias Dominik Kempf (University of Bern)H-Index: 1
Last.Othmar Müntener (UNIL: University of Lausanne)H-Index: 48
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Abstract Natural olivine from Zermatt (Switzerland) and Almklovdalen (Norway) were dehydrogenated at 1 bar, 517–1009 °C at various oxygen fugacity conditions. Following experiments, H contents (either bulk, or core-rim profiles) were measured using Fourier transform infrared spectroscopy, and spectra were resolved into Gaussian peaks. The starting olivine contained ∼150 and ∼10 wt. ppm H2O for the Zermatt and Almklovdalen samples respectively, but importantly the initial H distribution in both c...
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#1Alice Vho (University of Bern)H-Index: 1
#2Pierre Lanari (University of Bern)H-Index: 16
Last.Jörg Hermann (University of Bern)H-Index: 62
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Abstract. Oxygen isotope geochemistry is a powerful tool for investigating rocks that interacted with fluids, to assess fluid sources and quantify the conditions of fluid-rock interaction. We present an integrated modelling approach and the computer program PTLOOP that combine thermodynamic and oxygen isotope fractionation modelling for multi-rock open systems. The strategy involves a robust petrological model performing on-the-fly Gibbs energy minimizations coupled to an oxygen fractionation mo...
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#1Daniela RubattoH-Index: 49
#2Kate R BostonH-Index: 1
Last.Yuri AmelinH-Index: 36
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#1Daniela RubattoH-Index: 49
#2Kate R BostonH-Index: 1
Last.Yuri AmelinH-Index: 36
view all 5 authors...
#1Daniela RubattoH-Index: 49
#2Kate R BostonH-Index: 1
Last.Yuri AmelinH-Index: 36
view all 5 authors...
#1Daniela RubattoH-Index: 49
#2Kate R BostonH-Index: 1
Last.Yuri AmelinH-Index: 36
view all 5 authors...
#1Peter Tollan (University of Bern)H-Index: 1
#2Jörg Hermann (University of Bern)H-Index: 62
Elevated H2O concentrations and oxygen fugacities are two fundamental properties that distinguish magmas formed in subduction zones from new crust generated at mid-ocean ridges. However, the mechanism of magma oxidation and how it relates to the increase in H2O remain unclear. In this study, we used infrared spectroscopy of mantle wedge orthopyroxene to trace the temporal and spatial evolution of oxygen fugacity during the transport of hydrous arc melts towards the crust. A positive correlation ...
4 CitationsSource
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