Evidence for lithium-aluminosilicate supersaturation of pegmatite-forming melts

Maneta, Victoria; Baker, Don R.; Minarik, W. G.

doi:10.1007/s00410-015-1158-z

Cited by 48 publications

(12 citation statements)

References 43 publications

(59 reference statements)

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“…The Rayleigh fractionation models suggest that with extensive crystallisation the Li content of the last remaining melt can be significantly increased. This is similar to extensive fractionation of granitic melts where the final pegmatitic liquids often produce Li-bearing mineral phases at sub-magmatic temperatures 45 , 46 . In the welded ignimbrites of the Snake River Plain, the contacts between the glassy vitrophyres and the microcrystalline interiors are typically sharp (Fig.…”

Section: Discussionmentioning

confidence: 53%

Post-eruptive mobility of lithium in volcanic rocks

et al. 2018

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To reflect magmatic conditions, volcanic rocks must retain their compositions through eruption and post-eruptive cooling. Mostly, this is the case. However, welded ignimbrites from the Yellowstone–Snake River Plain magmatic province reveal systematic modification of the lithium (Li) inventory by post-eruptive processes. Here we show that phenocrysts from slowly cooled microcrystalline ignimbrite interiors consistently have significantly more Li than their rapidly quenched, glassy, counterparts. The strong association with host lithology and the invariance of other trace elements indicate that Li remains mobile long after eruption and readily passes into phenocrysts via diffusion as groundmass crystallisation increases the Li contents of the last remaining melts. Li isotopic measurements reveal that this diffusion during cooling combined with efficient degassing on the surface may significantly affect the Li inventory and isotopic compositions of volcanic rocks. Utilisation of Li for petrogenetic studies is therefore crucially dependent on the ability to ‘see through’ such post-eruptive processes.

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Section: Discussionmentioning

confidence: 53%

Post-eruptive mobility of lithium in volcanic rocks

et al. 2018

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“…The absence of primary petalite or evidence of petalite breakdown (sqi) indicate Leinster pegmatites crystallised in the conditions of the spodumene stability field (London 2005) at pressures of at least ~150 MPa and maximum temperature of ~725 o C. This is equivalent to depths greater than 4-5 km. Maneta and Baker (2014) and Maneta et al (2015) showed pegmatite-forming melts may accumulate thousands of ppm Li above saturation before the crystallization of Li-aluminosilicates. Pegmatite bodies formed by Li-supersaturated melts are expected to have abundant Li-aluminosilicates in proximity with the wallrocks (Maneta et al 2015).…”

Section: Magmatic Stagementioning

confidence: 99%

“…Maneta and Baker (2014) and Maneta et al (2015) showed pegmatite-forming melts may accumulate thousands of ppm Li above saturation before the crystallization of Li-aluminosilicates. Pegmatite bodies formed by Li-supersaturated melts are expected to have abundant Li-aluminosilicates in proximity with the wallrocks (Maneta et al 2015). These textural characteristics are observed in Leinster as spodumene is at, or within a few centimetres of, the contact surfaces with wallrocks (Figs.…”

Section: Magmatic Stagementioning

confidence: 99%

Controls on chemical evolution and rare element enrichment in crystallising albite-spodumene pegmatite and wallrocks: Constraints from mineral chemistry

Barros

Kaeter

Menuge

et al. 2020

Lithos

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“…However, pegmatites are commonly zoned with the sequential crystallization (London 2018). In zoned pegmatites, Li minerals rarely occur in the border or wall zones from the start of crystallization unless the melt is substantially undercooled (Maneta et al 2015). Most Li minerals occur in the intermediate zone or core after extended (70%-80%) fractional crystallization (Maneta and Baker 2014;London and Morgan 2017).…”

Section: Comparisons With Typical Lct Pegmatites Worldwide: Toward a Generalized Sequence Of LI Crystallization In Lct-type Pegmatitesmentioning

confidence: 99%

Paragenesis of Li minerals in the Nanyangshan rare-metal pegmatite, Northern China: Toward a generalized sequence of Li crystallization in Li-Cs-Ta-type granitic pegmatites

Yang

Wang

Che

et al. 2022

American Mineralogist

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The Nanyangshan Li-Cs-Ta (LCT) pegmatite is the largest of hundreds of pegmatite dikes in the eastern Qinling orogenic district, North China. The Nanyangshan pegmatite is strongly zoned into a contact zone, border zone, wall zone, intermediate zone and core, with Li mineralization occurring predominantly in the intermediate zone. Inwards through the intermediate zone, Li mineralization is divided into subzones of Spd (spodumene), Mbs (montebrasite), Elb (elbaite), and Lpd (lepidolite). Lithium minerals include spodumene, montebrasite, lithiophilite, elbaite, lepidolite, and possible former petalite. Paragenetic assemblages of Li minerals are variable, with spodumene ± Li-phosphates (montebrasite and This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Evidence for lithium-aluminosilicate supersaturation of pegmatite-forming melts

Cited by 48 publications

References 43 publications

Post-eruptive mobility of lithium in volcanic rocks

Post-eruptive mobility of lithium in volcanic rocks

Controls on chemical evolution and rare element enrichment in crystallising albite-spodumene pegmatite and wallrocks: Constraints from mineral chemistry

Paragenesis of Li minerals in the Nanyangshan rare-metal pegmatite, Northern China: Toward a generalized sequence of Li crystallization in Li-Cs-Ta-type granitic pegmatites

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