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Jörg Hermann
University of Bern
226Publications
59H-index
10.4kCitations
Publications 226
Newest
Published on Jul 1, 2019in Geochimica et Cosmochimica Acta 4.26
Michael C. Jollands5
Estimated H-index: 5
(UNIL: University of Lausanne),
Elias Dominik Kempf (University of Bern)+ 1 AuthorsOthmar Müntener48
Estimated H-index: 48
(UNIL: University of Lausanne)
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 resolved into Gaussian peaks. The starting olivine contained ∼150 and ∼10 wt. ppm H 2 O for the Zermatt and Almklovdalen samples respectively, but importantly the initial H distribution in both corr...
Published in Nature Geoscience 14.48
Peter Tollan1
Estimated H-index: 1
(University of Bern),
Jörg Hermann59
Estimated H-index: 59
(University of Bern)
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 ...
Published on Apr 1, 2019in American Mineralogist 2.63
Jörg Hermann59
Estimated H-index: 59
(University of Bern)
Published on Dec 1, 2018in Geostandards and Geoanalytical Research 4.26
Maria Rosa Scicchitano1
Estimated H-index: 1
(ANU: Australian National University),
Daniela Rubatto49
Estimated H-index: 49
(UNIL: University of Lausanne)
+ 4 AuthorsYong-Fei Zheng72
Estimated H-index: 72
(USTC: University of Science and Technology of China)
We present the first investigation of in situ oxygen isotopes in serpentine minerals by sensitive high-resolution ion microprobe (SHRIMP). Chemically homogeneous samples of antigorite (d18O = 8.30 ± 0.12‰), chrysotile (d18O = 4.37 ± 0.02‰) and lizardite (d18O = 5.26 ± 0.20‰) analysed by laser fluorination are identified as potential reference materials. They were analysed by SHRIMP to assess their homogeneity compared with the San Carlos olivine, as well as for potential matrix bias and crystal ...
Published on Nov 1, 2018in Contributions to Mineralogy and Petrology 3.23
Peter Michael Edward Tollan4
Estimated H-index: 4
(ANU: Australian National University),
Hugh St. C. O’Neill53
Estimated H-index: 53
(ANU: Australian National University),
Jörg Hermann59
Estimated H-index: 59
(University of Bern)
We conducted a series of hydroxylation experiments using mm-sized cuboids cut from six different crystals of San Carlos olivine with a range of trace-element concentrations. The cuboids were pre-annealed and then hydroxylated under identical conditions, ensuring that variation in the amounts of H incorporated depended only on the compositional variables. The pre-anneal was at 1400 °C, atmospheric pressure and an oxygen fugacity equivalent to Δlog FMQ + 1, with the subsequent hydroxylation at 800...
Published on Nov 1, 2018in Chemical Geology 3.62
Maria Rosa Scicchitano1
Estimated H-index: 1
(ANU: Australian National University),
Daniela Rubatto49
Estimated H-index: 49
(UNIL: University of Lausanne)
+ 2 AuthorsAndrew Putnis56
Estimated H-index: 56
(Curtin University)
Abstract In order to resolve inter- and intracrystalline oxygen isotopic heterogeneities in olivine crystals encountered in mantle peridotites, basaltic lavas, chondritic meteorites and metamorphic rocks, in situ techniques such as ion microprobes are needed. Accurate ion microprobe analysis requires not only well-characterised reference materials, but also calibration of the matrix bias for compositional variations within a given mineral. We investigated matrix bias effects related to Mg/Fe var...
Published on Sep 1, 2018in Contributions to Mineralogy and Petrology 3.23
Julien Reynes (ANU: Australian National University), Michael C. Jollands5
Estimated H-index: 5
(UNIL: University of Lausanne)
+ 1 AuthorsTrevor R. Ireland53
Estimated H-index: 53
(ANU: Australian National University)
The incorporation mechanisms and diffusional loss of hydrogen in garnet have been experimentally investigated. A suite of gem-quality hydrous spessartine- and grossular-rich garnets were analysed by Fourier transform infrared spectroscopy (FTIR) and by ion microprobe (SHRIMP-SI) to determine the calibration coefficients for quantification of FTIR data. The excellent agreement between measured absorption and OH/O indicates that the same molar extinction coefficient can be used for spessartine and...
Published on Aug 1, 2018in Earth and Planetary Science Letters 4.64
M.J. Sieber1
Estimated H-index: 1
(ANU: Australian National University),
Jörg Hermann59
Estimated H-index: 59
(University of Bern),
Gregory M. Yaxley31
Estimated H-index: 31
(ANU: Australian National University)
The carbonation of serpentinites in the forearc region of the mantle wedge in subduction zones and of serpentinites within the subducting slab by fluids derived from prograde dehydration and decarbonation has important implications for the deep Earth carbon cycle. This study shows that the carbonation of serpentinites under the forearc can establish, over time, a significant reservoir for carbon within a partially hydrated mantle wedge and that carbonation of (ultra-) mafic rocks within the subd...
Published on Aug 1, 2018in Geochimica et Cosmochimica Acta 4.26
Mark A. Kendrick25
Estimated H-index: 25
(ANU: Australian National University),
Marco Scambelluri35
Estimated H-index: 35
+ 1 AuthorsJosé Alberto Padrón-Navarta21
Estimated H-index: 21
(University of Montpellier)
Ophiolitic serpentinites and secondary peridotites formed by serpentinite dehydration were investigated to improve constraints on the fates of noble gases and halogens during subduction zone metamorphism. The work extends previous studies to encompass F and four stages of serpentinization and serpentinite dehydration including: (i) oceanic serpentinites preserving the features of seafloor serpentinization; (ii) subducted high grade (olivine bearing) antigorite-serpentinites; (iii) spinifex and g...
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