Stealth Metasomatism in Granulites from Ivrea (NW Italy): Hydration of the (Variscan) Lower Crust by Melt Flow
Abstract
:1. Introduction
2. Geological Setting
2.1. Kinzigite Formation
2.2. Mafic Complex
2.3. Ultramafic Massifs
3. Methods
4. Results
4.1. Field Evidence
4.1.1. Mafic Granulites
4.1.2. Enderbites
4.1.3. Amphibole-Rich Dykes, Pods, and Lenses
4.1.4. Quartz-Feldspathic Dykes
4.1.5. Stronalites
4.1.6. Alpine Overprint
4.2. Petrography, Mineral Chemistry, and Thermobarometry
4.2.1. Mafic Lithologies
4.2.2. Enderbites
4.2.3. Mineral Trace Element Composition in Mafic Lithologies
4.2.4. Thermobarometry
5. Discussion
5.1. Comparison between the Ivrea Granulites and the Other Granulites of the Ivrea–Verbano Zone
5.2. The Stealth Metasomatism of the Mafic Complex in Ivrea
5.3. Geodynamic Implicationsof the Metasomatic Melt
5.4. Permian Hydration of the Southalpine Lower Crust and Implications for Alpine Magma-Poor Rifting
6. Conclusions
- The granulites of the southern IVZ show many similarities with those belonging to the LMC of the central IVZ (Sessera Valley) and are supposed to be genetically similar to them, although with a possible lower degree of crustal contamination. The presence of stronalitic septa could indicate the proximity of a not-outcropping UMC to the southeast.
- The interstitial pargasitic amphibole and An-rich plagioclase in the mafic granulites have a metasomatic origin (stealth metasomatism) and were derived by the suprasolidus interactions between the former dry gabbro–norite with a more mafic hydrous–silicate melt that infiltrated along channels (now hornblenditic dykes) and then percolated along grain boundaries.
- The metasomatic melt likely corresponds to the Early-Mesozoic post-collisional orogenic basaltic magmas, whose infiltration is well documented in the northern IVZ (Finero area).
- The metasomatic event is responsible for the hydration of large volumes of the thick hot lower crust and for the changes in rheology of this crustal level.
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample Name | Coordinates (N, E) | Specimen Description |
---|---|---|
IZ21-01 | 45°26′47″, 7°52′48″ | Medium-grained enderbite |
IZ21-02 | 45°26′47″, 7°52′47″ | Coarse-grained enderbite |
IZ21-03 | 45°26′47″, 7°52′46″ | Coarse-grained enderbite in contact with fine-grained enderbitic dyke |
IZ21-04 | 45°26′51″, 7°52′53″ | Very coarse-grained enderbite |
IZ21-06 | 45°28′29″, 7°52′49″ | Fine-grained stronalite |
IZ21-07 | 45°28′29″, 7°52′50″ | Medium-grained stronalite |
IZ21-13 | 45°28′37″, 7°52′55″ | Medium-grained stronalite with cm-sized Grt porphyroblasts |
IZ21-14 | 45°26′41″, 7°51′50″ | Coarse-grained mafic granulite with pegmatoid coarse-grained lens |
IZ21-15 | 45°26′41″, 7°51′50″ | Cpx-rich band in contact with sample IZ21-14 |
IZ21-17 | 45°26′41″, 7°51′50″ | Coarse-grained Amp-rich mafic granulite |
IZ21-18 | 45°26′40″, 7°51′49″ | Coarse-grained mafic granulite |
IZ21-19 | 45°26′39″, 7°51′49″ | Anhydrous coarse-grained mafic granulite |
IZ21-20 | 45°26′39″, 7°51′48″ | Foliated coarse-grained mafic granulite |
IZ21-21 | 45°26′40″, 7°51′49″ | Slightly foliated medium-grained mafic granulite with Cpx porphyroblasts |
IZ21-22 | 45°26′37″, 7°51′56″ | Medium- to coarse-grained mafic granulite, rich in opaques |
IZ21-23 | 45°26′27″, 7°51′39″ | Homogeneous medium- to coarse-grained mafic granulite |
IZ23-02b | 45°28′19″, 7°52′58″ | Slightly foliated Amp–Cpx-poor mafic granulite with a pyroxenitic layer |
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Karastergios, S.; Ferrando, S.; Kunz, B.E.; Frezzotti, M.L. Stealth Metasomatism in Granulites from Ivrea (NW Italy): Hydration of the (Variscan) Lower Crust by Melt Flow. Geosciences 2024, 14, 218. https://doi.org/10.3390/geosciences14080218
Karastergios S, Ferrando S, Kunz BE, Frezzotti ML. Stealth Metasomatism in Granulites from Ivrea (NW Italy): Hydration of the (Variscan) Lower Crust by Melt Flow. Geosciences. 2024; 14(8):218. https://doi.org/10.3390/geosciences14080218
Chicago/Turabian StyleKarastergios, Stylianos, Simona Ferrando, Barbara E. Kunz, and Maria Luce Frezzotti. 2024. "Stealth Metasomatism in Granulites from Ivrea (NW Italy): Hydration of the (Variscan) Lower Crust by Melt Flow" Geosciences 14, no. 8: 218. https://doi.org/10.3390/geosciences14080218