What question did this study set out to answer?

To resolve the timing, conditions, and interplay of magmatic and hydrothermal processes responsible for rare-metal enrichment in the Beauvoir leucogranite.

September 10, 2024Chemical GeologyOpen Access

Unravelling the magmatic and hydrothermal evolution of rare-metal granites through apatite geochemistry and geochronology: The Variscan Beauvoir granite (French Massif Central)

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To resolve the timing, conditions, and interplay of magmatic and hydrothermal processes responsible for rare-metal enrichment in the Beauvoir leucogranite.
Analyzed in-situ major, trace, and halogen element compositions across suprasolidus and subsolidus apatite generations.
Conducted in-situ apatite oxygen isotope systematics and high-precision U-Pb geochronological dating across different depth units of the granite.
Dated initial magmatic crystallization to 314.6 ± 4.7 Ma, with diminishing europium anomalies marking an increase in magma oxygen fugacity that promoted primary cassiterite deposition.
Identified early hydrothermal greisenisation stages at 314.3 ± 5.5 Ma and 311.7 ± 8.1 Ma driven by magmatic fluids mixing with meteoric fluids at temperatures of 450 °C or higher.
Documented two distinct late-stage hydrothermal circulations at 268.3 ± 20.4 Ma and 148.5 ± 26.6 Ma marked by arsenic enrichment and heavy oxygen isotope signatures from regional post-orogenic events.

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Implication

Geochemical analysis reveals multi-stage magmatic and hydrothermal ore-forming processes in the Beauvoir granite, indicating open-system fluid mixing during rare-metal mineralization.

Cite This Study

Rocher et al. (2024) studied this question.

synapsesocial.com/papers/6a9197d49cd6bcde3cfb6375 https://doi.org/10.1016/j.chemgeo.2024.122400

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Implication

Geochemical analysis reveals multi-stage magmatic and hydrothermal ore-forming processes in the Beauvoir granite, indicating open-system fluid mixing during rare-metal mineralization.

Unravelling the magmatic and hydrothermal evolution of rare-metal granites through apatite geochemistry and geochronology: The Variscan Beauvoir granite (French Massif Central)

Key Points

Discussion

Implication

Cite This Study

Unravelling the magmatic and hydrothermal evolution of rare-metal granites through apatite geochemistry and geochronology: The Variscan Beauvoir granite (French Massif Central)

Key Points

Discussion

Implication

Cite This Study

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