Lithium and boron in late-orogenic granites – Isotopic fingerprints for the source of crustal melts?

Romer, Rolf L.; Meixner, Anette; Förster, Hans‐Jürgen

doi:10.1016/j.gca.2014.01.018

Cited by 76 publications

(24 citation statements)

References 98 publications

(140 reference statements)

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“…1). However, this  7 Li range is similar to the range of  7 Li values (-4 to +2‰) obtained on Erzgebirge granites by Romer et al (2014), Fig. 11.…”

Section: Insignificant Li-isotope Fractionation Throughout the Mapfsupporting

confidence: 87%

“…Similar observations are made by Romer et al (2014) who report a similarly narrow range of granite  7 Li (‰) values, Fig. 11.…”

Section:  7 LI As Reflecting Inherited Signatures Of Crustal Protolithssupporting

confidence: 87%

“…As suggested by Romer et al (2014), fluid-triggered wall-rock interactions may involve a shift in the primary Li isotope compositions of granites. In this case, meteoric fluids released during the intrusion of granites (i.e., development of a metamorphic contact aureole) influx into granitic magma leading the overprint of Li isotope compositions of magmatic fluids from which Li-bearing phases crystallize by meteoric fluids.…”

Section: Mixing-driven LI Isotope Fractionation?mentioning

confidence: 91%

“…11. These  7 Li signatures are interpreted as "isotopic fingerprints for the source of crustal melts" (Romer et al 2014). As has been proposed for the Erzgebirge granites, we suggest that the MAPF micas'  7 Li values (‰) correspond to inherited isotopic signatures from a common type of crustal source for both SSGC and the MAPF.…”

Section:  7 LI As Reflecting Inherited Signatures Of Crustal Protolithsmentioning

confidence: 99%

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The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in micas

2015

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International audienceIsotopic compositions in the Monts d’Ambazac Pegmatite Field (French Massif Central) exhibit a narrow range of mica δ7Li values, ranging from -3.6 to + 3.4‰. The value obtained in biotite from the host Saint Sylvestre granite falls within this range (δ7Li = -1.5‰). Lithium concentrations are consistent with the degree of magmatic evolution of each pegmatite type: from 630 ppm in Type II up to 13,500 ppm in the more evolved Type VI pegmatite. Although the rare-element contents e.g., Li, Cs, Ta of the micas are consistent with pegmatite differentiation, δ7Li (‰) are firstly, independent of the degree of magmatic differentiation (independent of pegmatite type) and secondly, independent of the content of Li and other flux-elements such as Be and Cs. Muscovite sampled in pegmatite V from the Chabannes locality is the only pegmatite to exhibit a δ7Li variation from intermediate unit (-1.7‰) to internal pegmatitic unit (+ 3.4‰). The nature of this δ7Li variation suggests that there was extensive fractional crystallisation during the pegmatite’s consolidation. The independence of δ7Li (‰) evolution from the degree of magmatic evolution and the presence of distinct major rare-element bearing phases throughout the pegmatite field tend to confirm that the δ7Li (‰) values recorded in mica are inherited from crustal source rocks common to the granite and pegmatite-forming melts. We propose that the distinct pegmatite subtypes (beryl columbite vs lepidolite-petalite subtypes) observed throughout the Monts d’Ambazac Pegmatite Field reflect the diverse contributions of crustal protoliths. The lack of evidence of surrounding alteration combined with the absence of increasing Li-content within the host granite tend to confirm that the δ7Li values obtained within this pegmatite field are primary, and that no Li-diffusional process and/or mixing-driven Li-isotope fractionation has overprinted these isotopic compositions. In light of these results, the process of partial melting of protoliths enriched in rare-element bearing phases, e.g., mica, garnet, seems to be more responsible for Li-isotope fractionation than Li-diffusion or fractional crystallisation at the temperature of pegmatite consolidation. Finally, we discuss the use of Li isotopic compositions to identify the most highly evolved pegmatitic systems

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“…1). However, this  7 Li range is similar to the range of  7 Li values (-4 to +2‰) obtained on Erzgebirge granites by Romer et al (2014), Fig. 11.…”

Section: Insignificant Li-isotope Fractionation Throughout the Mapfsupporting

confidence: 87%

“…Similar observations are made by Romer et al (2014) who report a similarly narrow range of granite  7 Li (‰) values, Fig. 11.…”

Section:  7 LI As Reflecting Inherited Signatures Of Crustal Protolithssupporting

confidence: 87%

Section: Mixing-driven LI Isotope Fractionation?mentioning

confidence: 91%

Section:  7 LI As Reflecting Inherited Signatures Of Crustal Protolithsmentioning

confidence: 99%

See 2 more Smart Citations

The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in micas

2015

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“…The mean d 7 Li of the Earth's primitive upper mantle (PUM -solid star; 3.5 ± 1.0&, 2r) is estimated from equilibrated peridotites (Magna et al, 2006;Jeffcoate et al, 2007;Seitz et al, 2007;Magna et al, 2008;Pogge von Strandmann et al, 2011). Mid-ocean ridge basalts (MORB) - Elliott et al, 2006;Chan et al, 1992;Tomascak et al, 2008; dark gray band -d 7 Li range in common granitic rocks of the upper continental crust (UCC); Li contents in various UCC lithologies are significantly elevated >14 ppm (Bryant et al, 2004;Teng et al, 2004;Magna et al, 2010;Romer et al, 2014).…”

Section: Distinguishing Between Terrestrial and Martian Lowtemperaturmentioning

confidence: 99%

Lithium isotope constraints on crust–mantle interactions and surface processes on Mars

Magna

Day

Mezger

et al. 2015

Geochimica et Cosmochimica Acta

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Formation and evolution of multistage hydrothermal fluids in the Baishitouwa quartz–wolframite vein‐type deposit in the southern Great Xing'an Range tungsten belt, NE China: Constraints from individual fluid inclusion LA‐ICP‐MS analysis

et al. 2023

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Revealing hydrothermal evolution from the early oxide to late carbonate stages for quartz-wolframite vein-type deposits is essential for understanding the ore-forming process. In this study, we choose the Baishitouwa tungsten polymetallic deposit located in the southern Great Xing'an Range tungsten belt as a case study, and present detailed deposit geology and in situ fluid inclusion (FI) analyses including microthermometry, laser Raman spectra, and LA-ICP-MS microanalysis to address this issue. Four stages of hydrothermal activity were identified: (1) quartz-wolframite (I),(2) quartz-wolframite (II)-pyrite-chalcopyrite, (3) quartz-polymetallic sulphides, and (4) quartz-carbonate. Four types of FIs were recognized: CO 2 -rich, CO 2 -bearing, liquid-rich, and brine inclusions. Microthermometric data showed that the homogenization temperatures and salinities from the early to late stages are 380-460 C,

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Lithium and boron in late-orogenic granites – Isotopic fingerprints for the source of crustal melts?

Cited by 76 publications

References 98 publications

The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in micas

The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in micas

Lithium isotope constraints on crust–mantle interactions and surface processes on Mars

Formation and evolution of multistage hydrothermal fluids in the Baishitouwa quartz–wolframite vein‐type deposit in the southern Great Xing'an Range tungsten belt, NE China: Constraints from individual fluid inclusion LA‐ICP‐MS analysis

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