What question did this study set out to answer?

To document changes in the trace-element chemistry of igneous quartz during the magmatic evolution and differentiation of contrasting rare-metal granite suites.

December 17, 2008European Journal of Mineralogy

Evolution of rare-metal granitic magmas documented by quartz chemistry

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To document changes in the trace-element chemistry of igneous quartz during the magmatic evolution and differentiation of contrasting rare-metal granite suites.
Optically differentiated six quartz populations across two late-Variscan granite suites (a peraluminous phosphorus-rich S-type and a slightly peraluminous phosphorus-poor A-type) from the Erzgebirge/Krušné Hory Mountains.
Quantified in situ concentrations of Li, Be, B, Al, Ge, P, K, Na, Ca, Ti, Mn, and Fe in quartz populations using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS).
Titanium was the only element whose concentration systematically decreased with progressive fractionation, while aluminium was the most abundant trace element (100–1200 μg g⁻¹), incorporated via the coupled substitution Si⁴⁺ ↔ Al³⁺ + (Li, K, H)⁺.
Aluminium concentrations increased from early to late quartz generations by a factor of 3 in Podlesí and 10 in Kateřina, despite granite aluminium saturation indices remaining nearly stable (1.20–1.35 and 1.05, respectively).
Concentrations of B, Be, Ge, Fe, Mn, and P generally remained below 10 μg g⁻¹, though erratic spikes in Fe and Mn in marginal pegmatites indicated external fluid infiltration during crystallization.

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Implication

Geochemical analysis reveals systematic trace-element shifts in igneous quartz across granitic suites, indicating that titanium and aluminium track magmatic differentiation and fluid infiltration.

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Karel Breiter (2008) studied this question.

synapsesocial.com/papers/6a8ecb53159e2969267d90e9 https://doi.org/10.1127/0935-1221/2009/0021-1907

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Implication

Geochemical analysis reveals systematic trace-element shifts in igneous quartz across granitic suites, indicating that titanium and aluminium track magmatic differentiation and fluid infiltration.

Evolution of rare-metal granitic magmas documented by quartz chemistry

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Implication

Cite This Study

Evolution of rare-metal granitic magmas documented by quartz chemistry

Key Points

Discussion

Implication

Cite This Study

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