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This study examines how changes in magma influence the formation and composition of quartz in highly peraluminous rare-metal granites.

July 11, 2026Open Access

Quartz as a recorder of the magmatic-hydrothermal transition in highly peraluminous rare-metal granites

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This study examines how changes in magma influence the formation and composition of quartz in highly peraluminous rare-metal granites.
Investigated the Beauvoir leucogranite from the French Paleozoic Variscan belt.
Analyzed magmatic quartz and associated fluid inclusions integrating detailed petrographic observations.
Conducted in situ analyses of trace-element compositions and oxygen isotopes in quartz.
Early formation of quartz showed increasing Li and Al contents during granite differentiation.
Crystal rims exhibited systematic depletion in Li and Al due to fluid influence on crystallization.
High-intensity magmatic volatile phase exsolution event led to snowball-textured quartz with low δ¹⁸O values, promoting cassiterite crystallization.

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Randomized trial shows the influence of magmatic volatile phase on quartz crystallization in granites, indicating a complex evolution process.

Rocher et al. (2026) studied this question.

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Randomized trial shows the influence of magmatic volatile phase on quartz crystallization in granites, indicating a complex evolution process.