Articles | Volume 16, issue 3
https://doi.org/10.5194/se-16-233-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-16-233-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
13 Mar 2025
Research article |
| 13 Mar 2025
| 13 Mar 2025
Hydroxyl in eclogitic garnet, orthopyroxene, and oriented inclusion-bearing clinopyroxene, western Norway
Dirk Spengler
CORRESPONDING AUTHOR
Department of Mineralogy, Petrography and Geochemistry, AGH University of Krakow, al. A. Mickiewicza 30, 30-059 Krakow, Poland
Monika Koch-Müller
Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany
Adam Włodek
Department of Mineralogy, Petrography and Geochemistry, AGH University of Krakow, al. A. Mickiewicza 30, 30-059 Krakow, Poland
Simon J. Cuthbert
Department of Mineralogy, Petrography and Geochemistry, AGH University of Krakow, al. A. Mickiewicza 30, 30-059 Krakow, Poland
Jarosław Majka
Department of Mineralogy, Petrography and Geochemistry, AGH University of Krakow, al. A. Mickiewicza 30, 30-059 Krakow, Poland
Department of Earth Sciences, Uppsala University, Villavägen 16, 752-36 Uppsala, Sweden
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Dirk Spengler, Adam Włodek, Xin Zhong, Anselm Loges, and Simon J. Cuthbert
Eur. J. Mineral., 35, 1125–1147, https://doi.org/10.5194/ejm-35-1125-2023, https://doi.org/10.5194/ejm-35-1125-2023, 2023
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Rock lenses from the diamond stability field (>120 km depth) within ordinary gneiss are enigmatic. Even more when these lenses form an alternating exposure pattern with ordinary lenses. We studied 10 lenses from W Norway and found that many of them have a hidden history. Tiny needles of quartz enclosed in old pyroxene cores are evidence for a rock origin at great depth. These needles survived the rocks' passage to the surface that variably obscured the mineral chemistry – the rocks' memory.
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Eur. J. Mineral., 36, 1023–1036, https://doi.org/10.5194/ejm-36-1023-2024, https://doi.org/10.5194/ejm-36-1023-2024, 2024
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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.
Christian Lathe, Monika Koch-Müller, Bernd Wunder, Oona Appelt, Melanie Sieber, Shrikant Bhat, and Robert Farla
Eur. J. Mineral., 35, 1149–1157, https://doi.org/10.5194/ejm-35-1149-2023, https://doi.org/10.5194/ejm-35-1149-2023, 2023
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We examined the reaction phase A plus high-P clinoenstatite to forsterite plus water (Reaction 1) by means of in situ X-ray diffraction measurements with the large volume press at the synchrotron PETRA III, Hamburg. Contrary to other studies, in which all experiments on Reaction (1) were performed at a water activity of 1, the reversed experiments presented in this study were performed at reduced water activity with mole fractions of about XH2O = XCO2 = 0.5.
Dirk Spengler, Adam Włodek, Xin Zhong, Anselm Loges, and Simon J. Cuthbert
Eur. J. Mineral., 35, 1125–1147, https://doi.org/10.5194/ejm-35-1125-2023, https://doi.org/10.5194/ejm-35-1125-2023, 2023
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Rock lenses from the diamond stability field (>120 km depth) within ordinary gneiss are enigmatic. Even more when these lenses form an alternating exposure pattern with ordinary lenses. We studied 10 lenses from W Norway and found that many of them have a hidden history. Tiny needles of quartz enclosed in old pyroxene cores are evidence for a rock origin at great depth. These needles survived the rocks' passage to the surface that variably obscured the mineral chemistry – the rocks' memory.
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Carbonates reduce the melting point of the mantle, and carbonate melts produced in low-degree melting of a carbonated mantle are considered the precursor of CO2-rich magmas. We established experimentally the melting relations of carbonates up to 9 GPa, showing that Mg-carbonates melt incongruently to periclase and carbonate melt. The trace element signature of carbonate melts parental to kimberlites is approached by melting of Mg-rich carbonates.
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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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Eur. J. Mineral., 33, 659–673, https://doi.org/10.5194/ejm-33-659-2021, https://doi.org/10.5194/ejm-33-659-2021, 2021
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Eur. J. Mineral., 32, 469–482, https://doi.org/10.5194/ejm-32-469-2020, https://doi.org/10.5194/ejm-32-469-2020, 2020
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Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Geochemistry, mineralogy, petrology, and volcanology | Discipline: Petrology
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Johannes Stefanski and Sandro Jahn
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Alice Vho, Pierre Lanari, Daniela Rubatto, and Jörg Hermann
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Xin Zhong, Evangelos Moulas, and Lucie Tajčmanová
Solid Earth, 11, 223–240, https://doi.org/10.5194/se-11-223-2020, https://doi.org/10.5194/se-11-223-2020, 2020
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Federico Lucci, Gerardo Carrasco-Núñez, Federico Rossetti, Thomas Theye, John Charles White, Stefano Urbani, Hossein Azizi, Yoshihiro Asahara, and Guido Giordano
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We study the petrographical and geochemical occurrence of magmatic sulfide minerals in volcanic rocks for areas characterised by different geodynamic settings, some of which are associated with porphyry (Cu and/or Au) and Au epithermal mineralisation. The aim is to investigate the role of magmatic sulfide saturation processes in depth for ore generation in the surface.
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Short summary
Western Norwegian “diamond facies” eclogite contains tiny mineral inclusions of quartz and amphibole lamellae that are not stable in the diamond field. Low trace amounts of water in the lamellae-bearing host minerals suggest that the inclusion microstructure was not formed by fluid infiltration but by dehydration during early exhumation of these rocks. Some samples with higher water content argue that a late fluid overprint was spatially restricted and erased evidence of extreme metamorphism.
Western Norwegian “diamond facies” eclogite contains tiny mineral inclusions of quartz and...
