Articles | Volume 36, issue 2
https://doi.org/10.5194/ejm-36-279-2024
© Author(s) 2024. This work is distributed under
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the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-36-279-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Mar 2024
Research article |
| 15 Mar 2024
| 15 Mar 2024
Halogen-bearing metasomatizing melt preserved in high-pressure (HP) eclogites of Pfaffenberg, Bohemian Massif
Faculty of Geology, Geophysics and Environmental Protection, AGH University of Kraków, 30-059 Kraków, Poland
Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
Silvio Ferrero
Dipartimento di Scienze Chimiche e Geologiche, University of Cagliari, 09042 Monserrato, Italy
Museum für Naturkunde (MfN), Leibniz-Institut für Evolutions- und Biodiversitätsforschung, 10115 Berlin, Germany
Patrick J. O'Brien
Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
Bernd Wunder
Deutsches GeoForschungsZentrum (GFZ), 14473 Potsdam, Germany
Peter Tollan
Eidgenössische Technische Hochschule, ETH, 8092 Zürich, Switzerland
Jarosław Majka
Faculty of Geology, Geophysics and Environmental Protection, AGH University of Kraków, 30-059 Kraków, Poland
Department of Earth Sciences, Uppsala University, 752-36 Uppsala, Sweden
Rico Fuchs
Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
Kerstin Gresky
Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
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We examined the influence of Al2O3 and H2O on the position of the coesite–stishovite transition by means of in situ X‑ray diffraction measurements with the large-volume press at the synchrotron PETRA III in Hamburg. The position of the transition was found to be shifted almost in parallel by about 1.5 GPa to lower pressures compared to results for the pure SiO2 system by Ono et al. (2017). Stishovite of this study containing Al and H is only partially quenchable but transforms back to coesite.
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Inclusions in natural rocks are an invaluable asset for geoscientists because they provide information about processes in the Earth's history that are otherwise hidden or subsequently overprinted. In this paper we review the development over the last 200 years of the concepts and methods to measure the remnant pressures in mineral inclusions and how they can be used to determine pressures and temperatures at which the inclusions were formed deep within the Earth.
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The equilibrium phase of A + HP clinoenstatite = forsterite + water was experimentally investigated at aH2O = 1 in situ. In cold subducting slabs, it is of relevance to transport water to large depths, initiating the formation of dense hydrous magnesium silicate (DHMS). At normal gradients, the huge water amount from this reaction induces important processes within the overlying mantle wedge. We additionally discuss the relevance of this reaction for intermediate-depth earthquake formation.
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Dense hydrous magnesium silicates, like the 3.65 Å phase, are thought to cause deep earthquakes. We investigated the dehydration of the 3.65 Å phase at P and T. In both directions of the investigated simple reaction, additional metastable water-rich phases occur. The observed extreme reduction in grain size in the dehydration experiments might cause mechanical instabilities in the Earth’s mantle and, finally, induce earthquakes.
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Short summary
We studied primary granitic and halogen-rich melt inclusions trapped in mantle rocks in the Bohemian Massif (Germany) in order to retrieve important information about the nature of the melt and the source rock. The melt was produced by the partial melting of metasediments during the deepest stages of subduction and interacted with the mantle. This work is an excellent example of transfer of crustal material, volatiles in particular, in the mantle during the subduction of the continental crust.
We studied primary granitic and halogen-rich melt inclusions trapped in mantle rocks in the...
