Abstract
AbstractA detailed geochronological study was conducted on zircons from a diorite sample of the Posets pluton (Axial Zone, Pyrenees). The extracted igneous zircons constrain the emplacement of the pluton to 302 ± 2 Ma and 301 ± 3 Ma, by means of U–Pb sensitive high-resolution ion microprobe (SHRIMP) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses, respectively. Considering the syn- to late-tectonic emplacement of the Posets pluton during the main Variscan deformation event (D2), the obtained ages constrain the long-lasting D2, associated with the dextral transpression registered through the Axial Zone of the Pyrenees.
Highlights
The Pyrenees, the E–W-trending orogenic belt that runs parallel to the French–Spanish border, were raised in response to the convergence of the Iberian and European plates in Cenozoic times
Considering the syn- to late-tectonic emplacement of the Posets pluton during the main Variscan deformation event (D2), the obtained ages constrain the longlasting D2, associated with the dextral transpression registered through the Axial Zone of the Pyrenees
We present new U–Pb sensitive high-resolution ion microprobe (SHRIMP) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses of zircons from a diorite sample of the Posets pluton (PO-52) to determine the precise age for the emplacement of the pluton
Summary
The Pyrenees, the E–W-trending orogenic belt that runs parallel to the French–Spanish border, were raised in response to the convergence of the Iberian and European plates in Cenozoic times. Late tectonic phases generated localized strike-slip ductile shear zones in granitoids and high-grade metamorphic rocks (Carreras & Capellà, 1994). In this context, the Variscan magmatism in the Pyrenees is mainly represented by calc-alcaline plutons of granite to granodiorite compositions emplaced into intermediate to shallow structural levels. Most plutons are of Carboniferous age and their emplacement age extends over 70 Myr from 339–337 Ma (granite stocks situated in the core of the Ordovician Aston and Bossòst domes; Mezger & Gerdes, 2016) to 267 ± 1 Ma (Aya pluton in the Western Pyrenees; Denèle et al 2012) This long timespan makes it difficult to establish an accurate time relationship between the development of S2 and the emplacement age for any given pluton from geological constraints alone. We present new U–Pb sensitive high-resolution ion microprobe (SHRIMP) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses of zircons from a diorite sample of the Posets pluton (PO-52) to determine the precise age for the emplacement of the pluton
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