Articles | Volume 35, issue 5
https://doi.org/10.5194/ejm-35-831-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-35-831-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
04 Oct 2023
Research article |
| 04 Oct 2023
| 04 Oct 2023
Very-low-grade phyllosilicates in the Aravis massif (Haute-Savoie, France) and the di-trioctahedral substitution in chlorite
Benoît Dubacq
CORRESPONDING AUTHOR
Institut des Sciences de la Terre
de Paris, ISTeP, UMR 7193, Sorbonne Université, CNRS-INSU, 75005 Paris, France
Guillaume Bonnet
Institut des Sciences de la Terre
de Paris, ISTeP, UMR 7193, Sorbonne Université, CNRS-INSU, 75005 Paris, France
Manon Warembourg
Institut des Sciences de la Terre
de Paris, ISTeP, UMR 7193, Sorbonne Université, CNRS-INSU, 75005 Paris, France
Benoît Baptiste
Institut de Minéralogie, de Physique des Matériaux et de
Cosmochimie, IMPMC, UMR 7590, Sorbonne Université, Muséum National d'Histoire Naturelle, CNRS, 75005 Paris, France
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Partition coefficients are key to petrological modelling yet hard to estimate independently of measurements. Here we model the partitioning of Cr between garnet and clinopyroxene ab initio. Incorporation of Cr into crystal structures causes strain, and its energetic toll defines whether Cr favours one mineral or another. Comparing to Cr content in metamorphic rocks shows how mineral composition and structure set equilibrium partition coefficients and how kinetics hampers equilibrium.
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Metamorphic petrology
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The La Picherais metagranite is a key example of undeformed high-pressure quartzofeldspathic rock from the Armorican Massif. Through petrological observations and thermodynamic modelling, this study determines that the metagranite was pressured above 1.7 GPa and the associated mafic lenses at ~ 2.1 GPa. This metagranite provides an opportunity to study the degree of transformation of quartzofeldspathic rocks at high pressure, which may have a significant impact on the dynamics of subduction.
Pan Tang and Shun Guo
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In this study, unusual corundum- and spinel-bearing symplectites after muscovite were found in ultrahigh-pressure eclogites from the Dabie terrane, China. The results indicate that these symplectites formed by the low-pressure partial melting of muscovite during slab exhumation. We stress that the occurrence of corundum- and spinel-bearing symplectites after muscovite in eclogites provides important implications for fluid and melt actions in exhumed slabs.
Michael Brown
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Larry Tuttle and Darrell J. Henry
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Quartz inclusions in garnet are used to constrain the metamorphic pressure–temperature history of multiple ~2.8 Ga metasedimentary rocks from Montana, USA. Inclusion studies along with mineral and whole rock chemistry suggests that the rocks of interest experienced a clockwise metamorphic P–T history that included isobaric heating to peak metamorphic temperatures once inclusions were entrapped. These findings place fundamental constraints on the P–T evolution of this important geologic setting.
Jan Schönig, Carsten Benner, Guido Meinhold, Hilmar von Eynatten, and N. Keno Lünsdorf
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When and how modern-style plate tectonics initiated is a matter of debate. Although the earliest unequivocal evidence for ultrahigh-pressure metamorphism is Neoproterozoic, similar processes have been proposed for Paleoproterozoic rocks of western Greenland. We intensely screened the area by studying detrital heavy minerals, garnet chemistry, and mineral inclusion assemblages in garnet. Our results raise considerable doubts on the existence of Paleoproterozoic ultrahigh-pressure rocks.
Sara Nerone, Chiara Groppo, and Franco Rolfo
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The coexistence of chloritoid and biotite in medium-pressure Barrovian terranes is uncommon, with chloritoid usually occurring at lower temperatures than biotite. A petrologic approach using equilibrium thermodynamic modelling points out how metapelites can attain H2O-undersaturated conditions even at medium pressure and amphibolite-facies conditions and consequently can be affected by kinetic barriers, which need to be taken into account.
Gerhard Franz, Martin Kutzschbach, Eleanor J. Berryman, Anette Meixner, Anselm Loges, and Dina Schultze
Eur. J. Mineral., 33, 401–423, https://doi.org/10.5194/ejm-33-401-2021, https://doi.org/10.5194/ejm-33-401-2021, 2021
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Metamorphic rocks contain information about their original rocks and thus provide insight into the earlier stages of a region of interest. Here, we used the whole-rock chemical composition and stable boron isotopes of a suite of rocks from the Alps (Italy–Austria), which were deposited in a restricted intramontane basin before the Alpine orogeny. It is possible to reconstruct the depositional conditions for these sediments, which are now common metamorphic rocks such as schists and gneisses.
Annette Süssenberger, Susanne Theodora Schmidt, Florian H. Schmidt, and Manuel F. G. Weinkauf
Eur. J. Mineral., 32, 653–671, https://doi.org/10.5194/ejm-32-653-2020, https://doi.org/10.5194/ejm-32-653-2020, 2020
Wentao Cao, Jane A. Gilotti, and Hans-Joachim Massonne
Eur. J. Mineral., 32, 405–425, https://doi.org/10.5194/ejm-32-405-2020, https://doi.org/10.5194/ejm-32-405-2020, 2020
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Zoisite eclogites from the Sanddal area, North-East Greenland, contain numerous textures, such as cusps and neoblasts, which are interpreted as melt-related textures. Mineral chemistry and thermodynamic modeling demonstrate that they were partially melted through the breakdown of hydrous minerals, phengite, paragonite and zoisite. Pressure–temperature phase diagrams show that the eclogites reached a maximum depth of ∼70 km and were partially melted near that depth and during exhumation.
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Short summary
Minerals in a vein network from the Aravis limestone (Haute-Savoie, France) include carbonates, quartz, fluorite and phyllosilicates, crystallized at around 7 km depth and 190 °C. The mineralogy has been studied with emphasis on the chlorite types: chamosite (iron-rich), cookeite (lithium-rich) and sudoite. The presence of the three chlorite types sheds light on their phase diagrams, and observed cationic substitutions confirm the need for more systematic measurement of lithium in chlorite.
Minerals in a vein network from the Aravis limestone (Haute-Savoie, France) include carbonates,...
