Contrasting chemical and isotopic signatures from Neoproterozoic metasedimentary rocks in the Central Iberian Zone (Spain) of pre-Variscan Europe: Implications for terrane analysis and Early Ordovician magmatic belts

Metasedimentary and igneous xenoliths from Tallante (Betic Cordillera, Spain): Inferences on crust–mantle interactions and clues for post-collisional volcanism magma sources

“…This hypothesis is confirmed by Sm-Nd and Rb-Sr model ages (Fig. 2a, b) calculated relative to the average meta-sedimentary composition of the Iberian basement (López-Guijarro et al, 2008;Villaseca et al, 2014), which suggest that the upper crust beneath Tallante suffered an important melting episode during the Paleozoic, plausibly between 300 and 320 Ma. These ages correspond to Variscan ages obtained on metasedimentary rocks from sections exposed in the neighboring occurrence of Ronda and Beni Bousera (Montel et al, 2000;Ruiz Cruz and Sanz de Galdeano, 2014) and in general conform to ages obtained on high-grade metamorphic rocks and S-type granitoids from various Iberian occurrences (Esteban et al, 2011;Merino Martínez et al, 2014).…”

“…1) reveals a marked depletion of most incompatible elements such as Light Rare Earth Elements (LREE) and Large Ion Lithophile Elements (LILE). Moreover, the comparison between these Tallante xenolith and metasedimentary analogues from Neoproterozoic-Lower Paleozoic Iberian outcrops (López-Guijarro et al, 2008;Pastor-Galán et al, 2013;Ugidos et al, 2003;Villaseca et al, 2014) confirms the extreme low abundance of LILE (e.g. Rb) and LREE (e.g.…”

“…The metasedimentary xenoliths (TL29, TL203 and TL380) reveal bulk 87 Sr/ 86 Sr ratios between 0.70771 and 0.72604, and 143 Nd/ 144 Nd ratios varying between 0.51239 and 0.51259. The 87 Sr/ 86 Sr ratios are less radiogenic (and the 143 Nd/ 144 Nd ratios are more radiogenic) with respect to the isotope composition of metasedimentary analogues from Neoproterozoic-Lower Paleozoic Iberian outcrops (López-Guijarro et al, 2008;Pastor-Galán et al, 2013;Ugidos et al, 2003;Villaseca et al, 2014). The 87 Sr/ 86 Sr ratio is correlated with the parent 87 Rb/ 86 Sr ratio, and 143 Nd/ 144 Nd ratio is correlated with the parent 147 Sm/ 144 Nd ratio (trace element analyses of these rocks are reported by Bianchini et al, 2013).…”

Petrographic and geochemical study of the stone warrior stelae from central Iberia: Linking the geological record and archaeological heritage

“…Neoproterozoic to Paleozoic metasedimentary rocks are predominantly found in the southern part of the CIZ (S‐CIZ), although they are also relatively common in its northern area (N‐CIZ; Figure a). Metasedimentary units from the N‐CIZ consist of Neoproterozoic to Cambrian pelitic rocks with medium‐ to high‐grade metamorphism (paragneisses to migmatites), with minor amphibolite, calc‐silicate, marble, or psammitic interlayers, showing high LILE, LREE and HFSE (Th, U, Zr, Hf, Nb, Ta) contents (e.g., Rubio Pascual, Arenas, Martínez Catalán, Rodríguez Fernández & Wijbrans, ; Villaseca et al, ). These metasediments are intruded by abundant Cambro‐Ordovician orthogneisses, followed by the deposition of other Paleozoic detrital sequences with intercalations of carbonate levels and acidic volcanic rocks (Vilas et al, ).…”

Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosán cupola (Central Iberian Zone)

“…* Ratio corrected for mass fractionation (0.11 ± 0.02 % AMU Pb; 0.10± 0.02 % AMU U), spike contribution and analytical blank (6 pg Pb; 0.1 pg U). The other isotopic ratios are also corrected for initial common Pb after the model of Stacey and Kramers (1975 (Castro et al, 1999;Antunes et al, 2008;González-Menéndez and Bea, 2004), the Spanish Central System (Villaseca et al, 1998) and crustal protoliths of the Central Iberian Zone (Beetsma, 1995;López-Guijarro et al, 2008;Ugidos et al, 1997;Villaseca et al, 2014). All data have been recalculated to a reference age of 300 Ma.…”