Fingerprinting sources of orogenic plutonic rocks from Variscan belt with lithium isotopes and possible link to subduction-related origin of some A-type granites

Magna, Tomáš; Janoušek, Vojtěch; Kohút, Milan; Oberli, Felix; Wiechert, Uwe

doi:10.1016/j.chemgeo.2010.03.020

Cited by 71 publications

(38 citation statements)

References 107 publications

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“…Archean TTG values of d 7 Li(WR) vary from 2.6 to 7.5%, with an average of 4.1 ± 3.9% (2SD). Paleozoic and Mesozoic granitoids have d 7 Li(WR) from -4.5 to ?8.9%, with an average of 1.2 ± 5.5% (2SD) (Magna et al 2010;Teng et al 2009). TTG zircons (d 7 Li = 3.0 ± 7.6%) have compositions similar to these Archean TTG and granitoid rocks, suggesting that Li isotopes in zircons are not largely altered over [2.5 Ga.…”

Section: Ttg Zirconsmentioning

confidence: 93%

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Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids

Bouvier

Ushikubo

Kita

et al. 2011

Contrib Mineral Petrol

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We report d 7 Li, Li abundance ([Li]), and other trace elements measured by ion probe in igneous zircons from TTG (tonalite, trondhjemite, and granodiorite) and sanukitoid plutons from the Superior Province (Canada) in order to characterize Li in zircons from typical Archean continental crust. These data are compared with detrital zircons from the Jack Hills (Western Australia) with U-Pb ages greater than 3.9 Ga for which parent rock type is not known. Most of the TTG and sanukitoid zircon domains preserve typical igneous REE patterns and CL zoning.[Li] ranges from 0.5 to 79 ppm, typical of [Li] in continental zircons. Atomic ratios of (Y ? REE)/(Li ? P) average 1.0 ± 0.7 (2SD) for zircons with magmatic composition preserved, supporting the hypothesis that Li is interstitial and charge compensates substitution of trivalent cations. This substitution results in a relatively slow rate of Li diffusion. The d 7 Li and trace element data constrain the genesis of TTGs and sanukitoids. [Li] in zircons from granitoids is significantly higher than from zircons in primitive magmas in oceanic crust. TTG zircons have d 7 Li (3 ± 8%) and d 18 O in the range of primitive mantlederived magmas. Sanukitoid zircons have average d 7 Li (7 ± 8%) and d 18 O higher than those of TTGs supporting genesis by melting of fluid-metasomatized mantle wedge. The Li systematics in sanukitoid and TTG zircons indicate that high [Li] in pre-3.9-Ga Jack Hills detrital zircons is a primary igneous composition and suggests the growth in proto-continental crust in magmas similar to Archean granitoids.

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Section: Ttg Zirconsmentioning

confidence: 93%

“…TTG zircons can be compared with other granitoids and Archean TTGs (Magna et al 2010;Teng et al 2008Teng et al , 2009). Teng et al (2008) reported whole-rock [Li] and d 7 Li for Archean terranes, including TTGs.…”

Section: Ttg Zirconsmentioning

confidence: 97%

Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids

Bouvier

Ushikubo

Kita

et al. 2011

Contrib Mineral Petrol

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“…Post-Paleoproterozoic rocks include glacial diamictites (this study) and other sedimentary rocks (loess, shales, clay) compiled from the literature (Bouman et al, 2004;Teng et al, 2004;Chan et al, 2006;Qiu et al, 2009Qiu et al, , 2011Sauzéat et al, 2015; Appendix Table A6-1). The d 7 Li and CIA data for average granites are compiled from Pearce et al, 1984;Castro et al, 1999;James and Palmer, 2000;Moyen et al, 2001;Wu et al, 2002;Rudnick et al, 2004;Teng et al, 2004Teng et al, , 2006Teng et al, , 2009Yang et al, 2004Yang et al, , 2006Magna et al, 2010;Liu et al, 2010;Cuccuru et al, 2012;Huang et al, 2013a,b,c. The d 7 Li and CIA data for average TTGs are from Teng et al, 2008;Donskaya et al, 2009;Qiu, 2011;Moyen, 2011;Seixas et al, 2012;Huang et al, 2013a,b,c.…”

Section: Introductionmentioning

confidence: 99%

Insights into chemical weathering of the upper continental crust from the geochemistry of ancient glacial diamictites

Gaschnig

Rudnick

2016

Geochimica et Cosmochimica Acta

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“…%), a typical calc-alkaline, subaluminous to peraluminous character (Shand's index -A/CNK = 0.9-1.4), high concentrations of Ba, Rb, Li, Cs, Mo, Nb, Y, V, W, Cr, F, Th, U and low concentrations of Sr, Zr and Be (Határ et al 1989). The low to moderate initial Sr isotope ratios (I Sr = 0.7083-0.7126), together with negative Nd (81) = -3.0 to -2.4, and stable isotopes values ( 18 O (VSMOW) = 8.0 to 8.3 ‰; 34 S (CDT) = -2.1 ‰; 7 Li (SVEC) = 4.7 ‰) suggest a lower crustal meta-igneous protolith (Hraško et al 1998;Kohút et al 2001;Magna et al 2010). Although the first K/Ar cooling ages on biotites 88-75 Ma (Kantor & Rybár 1979) indicated the Alpine-Cretaceous age of the Rochovce granite, Cambel et al (1989) still supposed its Permian age by means of Rb/Sr isochron GEOLOGICA CARPATHICA GEOLOGICA CARPATHICA GEOLOGICA CARPATHICA GEOLOGICA CARPATHICA GEOLOGICA CARPATHICA, 2013, 64, 1, 71-79 (WR) -253± 2 Ma.…”

Section: Geological Settingmentioning

confidence: 99%

Re-Os and U-Th-Pb dating of the Rochovce granite and its mineralization (Western Carpathians, Slovakia)

Kohút¹,

Stein²,

Uher³

et al. 2013

Geologica Carpathica

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The subsurface Rochovce granite intrusion was emplaced into the contact zone between two principal tectonic units (the Veporic Unit and the Gemeric Unit) of the Central Western Carpathians (CWC), Slovakia. The Cretaceous age of this granite and its Mo-W mineralization is shown using two independent methods: U-Pb on zircon and Re-Os on molybdenite. The studied zircons have a typical homogeneous character with oscillatory zoning and scarce restite cores. SHRIMP U-Pb data provide an age of 81.5 ± 0.7 Ma, whereas restite cores suggest a latest Neoproterozoic-Ediacaran age (~565 Ma) source. Zircon εHf(81) values -5.2 to + 0.2 suggest a lower crustal source, whereas one from the Neoproterozoic core εHf(565)= + 7.4 call for the mantle influenced old precursor. Two molybdenite- bearing samples of very different character affirm a genetic relation between W-Mo mineralization and the Rochovce granite. One sample, a quartz-molybdenite vein from the exocontact (altered quartz-sericite schist of the Ochtiná Formation), provides a Re-Os age of 81.4 ± 0.3 Ma. The second molybdenite occurs as 1-2 mm disseminations in finegrained granite, and provides an age of 81.6 ± 0.3 Ma. Both Re-Os ages are identical within their 2-sigma analytical uncertainty and suggest rapid exhumation as a consequence of post-collisional, orogen-parallel extension and unroofing. The Rochovce granite represents the northernmost occurrence of Cretaceous calc-alkaline magmatism with Mo-W mineralization associated with the Alpine-Balkan-Carpathian-Dinaride metallogenic belt.

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Fingerprinting sources of orogenic plutonic rocks from Variscan belt with lithium isotopes and possible link to subduction-related origin of some A-type granites

Cited by 71 publications

References 107 publications

Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids

Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids

Insights into chemical weathering of the upper continental crust from the geochemistry of ancient glacial diamictites

Re-Os and U-Th-Pb dating of the Rochovce granite and its mineralization (Western Carpathians, Slovakia)

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