Contrasting mantle sources and processes involved in a peri-Gondwanan terrane: A case study of pre-Variscan mafic intrusives from the autochthon of the Central Iberian Zone

Plaza, Miguel López; Peinado, Mercedes; Moro, Francisco Javier López; Rodríguez-Alonso, M. Dolores; Carnicero, Asunción; Franco, M. Piedad; Gonzalo, Juan Carlos; Navidad, M.

doi:10.1130/2007.2423(14)

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…Annen et al (2005) proposed that fractional crystallization in shallow magma chambers and dehydration crustal melting are optimal settings for generating intermediate to silicic magmas in an arc. Together with the Al 2 O 3 versus TiO 2 diagram of Lopez‐Plaza et al (2007), this indicates that the granites followed a fractional crystallization trend and the monzodiorites followed a mantle‐fractionated trend (Figure 13e,f).…”

Section: Discussionsupporting

confidence: 58%

“…(a) And (b) plots of ∫ Sm/Nd versus T DM1 ; (c) plot of ε Nd ( t ) versus T DM1 ; (d) plot of ε Nd ( t ) versus 87 Sr/ 86 Sr for samples from the Ghorveh area; (e) and (f) mantle partial melting and fractional crystallization trends in Al 2 O 3 versus TiO 2 diagram (after Lopez‐Plaza et al, 2007). Data for the Ebrahim‐Attar granites are from Azizi et al (2016), data for the Malayer granitoids are from Ahadnejad et al (2011), and data for the Ghorveh granite are from Azizi and Asahara (2013), Azizi et al (2011), and Azizi, Zanjefili‐Beiranvand, and Asahara (2015).…”

Section: Discussionmentioning

confidence: 99%

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Zircon U–Pb and titanite U–Th–Pb ages of the Ghorveh mixed granitoid pluton: Implications for the Late Jurassic supra‐subduction extension of the Sanandaj–Sirjan Zone, Iran

et al. 2022

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The Ghorveh batholith, located in the central part of the Sanandaj–Sirjan Zone (SSZ), Iran, preserves several sequences of Mesozoic plutonic and volcanic rocks. This study presents systematic analyses of the calc‐alkaline granites and monzodiorites from the southern part of the Ghorveh pluton. The granites are metaluminous to slightly peraluminous with A/CNK ratios of 0.97–1.02, indicating an A‐type granitic affinity. High Rb, Th, and K and low Sr, P, and Ti concentrations indicate an involvement of crustal materials. Whole‐rock negative εNd(t) values and relatively high TDM1 model ages support a continental crustal source. Thus, the granites are of fractionated A‐type in composition produced by partial melting of crustal materials. The monzodiorites have incompatible trace element patterns with enrichment in light rare earth elements (LREEs) and large‐ion lithophile elements (LILEs) relative to heavy rare earth elements and high‐field strength elements. This combined with the high Mg# values and the positive εNd and εHf(t) values, indicate a mantle‐derived origin. Dating results show that the granites and monzodiorites have uniform crystallization ages of ~150 Ma. Previous results and our new data suggest that the Jurassic subduction of Neo‐Tethyan Oceanic crust under the Eurasian continent was followed by slab rollback that induced back‐arc extension. Heat transfer from arc magmas increased the degree of decompressional melting in the thinned lithosphere. Melting of the presumably homogeneous crust was concurrent with emplacement of the intermediate composition magmas. Consequently, we propose that the Ghorveh area of the central SSZ developed in a supra‐subduction extensional phase during the Late Jurassic.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Zircon U–Pb and titanite U–Th–Pb ages of the Ghorveh mixed granitoid pluton: Implications for the Late Jurassic supra‐subduction extension of the Sanandaj–Sirjan Zone, Iran

et al. 2022

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“…Spatial distribution of shear zones and folds indicates NE-SW maximum compression trajectories [63], not deviating significantly from the stress configuration characterizing the previous deformation phases. The D3 (315-306 Ma) [39,44,56] deformation phase took place mostly after the climax of crustal thickening, followed by decompression and HT-LP metamorphism during which large volumes of crustal melting were produced [39,55,[64][65][66][67][68]. Late-to post-D3 (300-270 Ma) [63,69], conjugate strike-slip fault systems running NNE-SSW (left-lateral) and NNW-SSE (right-lateral) were further generated in brittle conditions, locally reactivating syn-D3 (and syn-D1) shear zones (e.g., [37][38][39]45]).…”

Section: Meso-cenozoic Covermentioning

confidence: 99%

The Lanthanide “Tetrad Effect” as an Exploration Tool for Granite-Related Rare Metal Ore Systems: Examples from the Iberian Variscan Belt

et al. 2022

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Highly fractionated granites and related magmatic-hydrothermal ore-forming processes can be traced by elemental ratios such as Nb/Ta, K/Rb, Y/Ho, Sr/Eu, Eu/Eu*, Zr/Hf, and Rb/Sr. The lanthanide “tetrad effect” parameter (TE1,3) can also be a useful geochemical fingerprint of highly fractionated granites. This work assesses its application as an exploration vector for granite-related mineralization in the Central Iberian Zone by examining TE1,3 variations with different elemental ratios and with the concentrations of rare metals and fluxing elements (such as F, P, and B). The multi-elemental whole-rock characterization of the main Cambrian–Ordovician and Carboniferous–Permian granite plutons and late aplite–pegmatite dykes exposed across the Segura–Panasqueira Sn-W-Li belt show that the increase in TE1,3 values co-vary with magmatic differentiation and metal-enrichment, being the Carboniferous–Permian granite rocks the most differentiated, and metal specialized. The Argemela Li-Sn-bearing rare metal granite and the Segura Li-phosphate-bearing aplite–pegmatite dykes deviate from this geochemical trend, displaying TE1,3 < 1.1, but high P2O5 contents. The results suggest that mineralized rocks related to peraluminous-high-phosphorus Li-Sn granite systems are typified by TE1,3 < 1.1, whereas those associated with peraluminous-high-phosphorus Sn-W-Li (lepidolite) and peraluminous-low-phosphorus Sn-Ta-Nb granite systems display TE1,3 > 1.1, reaching values as high as 1.4 and 2.1, respectively.

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The collapse of the Variscan belt: a Variscan lateral extrusion thin-skinned structure in NW Iberia

Silva

Clavijo

Montes

2020

International Geology Review

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Contrasting mantle sources and processes involved in a peri-Gondwanan terrane: A case study of pre-Variscan mafic intrusives from the autochthon of the Central Iberian Zone

Cited by 4 publications

References 37 publications

Zircon U–Pb and titanite U–Th–Pb ages of the Ghorveh mixed granitoid pluton: Implications for the Late Jurassic supra‐subduction extension of the Sanandaj–Sirjan Zone, Iran

Zircon U–Pb and titanite U–Th–Pb ages of the Ghorveh mixed granitoid pluton: Implications for the Late Jurassic supra‐subduction extension of the Sanandaj–Sirjan Zone, Iran

The Lanthanide “Tetrad Effect” as an Exploration Tool for Granite-Related Rare Metal Ore Systems: Examples from the Iberian Variscan Belt

The collapse of the Variscan belt: a Variscan lateral extrusion thin-skinned structure in NW Iberia

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