Geochemical Characterization, Geochronology, and Geodynamic Implications of Grenville Rare Earths Bearing Syenites, Haut-Saint-Maurice, QC, Canada
Abstract
:1. Introduction
1.1. Regional Geology
1.2. Local Geology
1.2.1. Wemotaci Intrusive Suite
1.2.2. Veillette Intrusive Suite
1.2.3. Chateauvert Intrusive Suite
1.2.4. Rheaume Intrusive Suite
1.2.5. Toad Intrusive Suite
1.2.6. Dix Milles Syenite
1.2.7. Lortie Syenite
1.2.8. Core Syenite
1.2.9. Bouvreuil Syenite
1.2.10. Bourguet Syenite
2. Materials and Methods
2.1. Whole-Rock Geochemistry
2.2. Electron Microprobe Analyses
2.3. µXRF
2.4. U-Pb Methodology
3. Results
3.1. Whole-Rock Geochemistry
3.2. Clinopyroxene and Amphibole Thermobarometry
3.3. Rare Earth Mineralization
3.3.1. Parisite
3.3.2. Allanite-Ce
3.3.3. Monazite
3.4. Geochronology
3.4.1. Wemotaci Intrusive Suite
Zircon Description
Analytical Results
3.4.2. Rheaume Intrusive Suite
Zircon Description
Analytical Results
4. Discussion and Conclusion
4.1. Geochemical Implications
4.2. Thermobarometric Implications
4.3. Geological Setting of REEs
4.4. Geodynamic Model
- The first event was an alkaline magmatic event associated with a volcanic arc that occurred between 1040 and 1015 Ma (Figure 7a). During this event, the enriched mantle metasomatism [12] gave rise to a wide range of ultramafic to intermediate alkaline intrusions (glimmerites, syenites, pyroxenites, gabbronorites), which are mutually related and show magma-mingling textures. The mantle enrichment resulted in the crystallization of economically interesting REE-bearing minerals (allanite) during this period. Back-arc basin magmatism was probably associated with this event, as indicated by the mafic to ultramafic rocks of the Simoncouche Gabbro. According to [34], this gabbro body formed at a depth of about 18 to 30 km and at a temperature of 937 to 1005 °C.
- The second was an alkalic magmatic event associated with an orogenic collapse that occurred between 1015 and 1000 Ma. This event produced the Labrieville Anorthosite [35], with its associated ultramafic rocks, lamprophyres [36], and alkaline intrusions (syenite and gabbronorite). During this event, there was less REE mineralization. The rocks display a within-plate signature corresponding to extensional magmatism. During this period, there might have been a slab break which provoqued an astheonospheric upwelling. This event permitted the crystallisation of mafic to ultramafic rocks as the anorthosite. The emplacement of the Labrieville anorthosite during this period strengthens the anorogenic model. These Haut-Saint-Maurice syenitic intrusions of this period formed at a depth of about 6 to 18 km and at a temperature of 900 to 1000 °C.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
References
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Côté, G.; Moukhsil, A.; Constantin, M.; David, J. Geochemical Characterization, Geochronology, and Geodynamic Implications of Grenville Rare Earths Bearing Syenites, Haut-Saint-Maurice, QC, Canada. Minerals 2018, 8, 336. https://doi.org/10.3390/min8080336
Côté G, Moukhsil A, Constantin M, David J. Geochemical Characterization, Geochronology, and Geodynamic Implications of Grenville Rare Earths Bearing Syenites, Haut-Saint-Maurice, QC, Canada. Minerals. 2018; 8(8):336. https://doi.org/10.3390/min8080336
Chicago/Turabian StyleCôté, Gabriel, Abdelali Moukhsil, Marc Constantin, and Jean David. 2018. "Geochemical Characterization, Geochronology, and Geodynamic Implications of Grenville Rare Earths Bearing Syenites, Haut-Saint-Maurice, QC, Canada" Minerals 8, no. 8: 336. https://doi.org/10.3390/min8080336