Anisotropy of magnetic susceptibility of the Pyrenean granites

Porquet, Manuel; Pueyo, Emilio L.; Román‐Berdiel, Teresa; Olivier, Philippe; Longares, Luis Alberto; Cuevas, Julia; Ramajo, Javier; Antolín, Borja; Aranguren, A.; Auréjac, Jean Baptiste; Bouchez, Jean‐Luc; Casas, A.; Denèle, Yoann; Gleizes, Gérard; Hilario, Asier; Izquierdo‐Llavall, Esther; Leblanc, Dennis; Oliva‐Urcia, Belén; Santana, Vicente; Tubía, José María; Vegas, Néstor

doi:10.1080/17445647.2017.1302364

Cited by 15 publications

(14 citation statements)

References 50 publications

(52 reference statements)

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“…(3) the existence of S-shaped lineation patterns in the Posets pluton is similar, in both its layout and orientation (Fig. 2), to sigmoidal lineation patterns that have been linked with dextral transpression in many other synkinematic Pyrenean granites (Bouchez & Gleizes, 1995;Gleizes et al 1998b;Román-Berdiel et al 2004;Porquet et al 2017). It thus seems reasonable to consider the Posets pluton as a syn-to late-kinematic granite emplaced during the dextral transpression triggered at the end of the long-lasting Variscan deformational event (D 2 ).…”

Section: Discussionmentioning

confidence: 77%

“…Structural and anisotropy-of-magnetic-susceptibility (AMS) studies of the granitoids in the Pyrenees (Porquet et al 2017) have demonstrated that their emplacement was coeval with the main Variscan D 2 transpressive event (see Bouchez & Gleizes, 1995;Carreras & Druguet, 2014). 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).…”

Section: Introductionmentioning

confidence: 99%

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Posets pluton: a geochronological piece in the puzzle of the Axial Zone of the Pyrenees

et al. 2021

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A 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.

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Section: Discussionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Posets pluton: a geochronological piece in the puzzle of the Axial Zone of the Pyrenees

et al. 2021

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“…During the Carboniferous and Early Permian, the Pyrenees recorded an intense igneous activity including syn-to post-kinematic plutonism and volcanism (Fig. 1B; e.g., Gleizes et al, 1997Gleizes et al, , 2003Denèle et al, 2011Denèle et al, , 2014Porquet et al, 2017), sometimes interpreted as subduction related (e.g., Pereira et al, 2014).…”

Section: Paleozoic History: Variscan Cyclementioning

confidence: 99%

Paleomagnetism from multi-orogenic terranes is "not a simple game": Pyrenees' Paleozoic warning

Pastor‐Galán¹,

Groenhof²,

Pueyo³

et al. 2021

Preprint

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Paleomagnetism is a versatile tool in the Earth sciences: it provides critical input to geological time scales and plate tectonic reconstructions. Despite its undeniable perks, paleomagnetism is not without complications. Remagnetizations overprinting the original magnetic signature of rocks are frequent, especially in orogens which tend to be the areas with better rock exposure. Unraveling the magnetic history of the rocks is a complicated task, especially in areas that underwent several orogenic pulses. In turn, constraining the timing of remagnetization represents an opportunity to solve post-magnetization structural and tectonic kinematics. Here, we evaluate the magnetization history of Silurian-Devonian carbonates from the Axial Zone of the Pyrenees. The Pyrenees are a multi-orogenic mountain belt where Silurian-Devonian rocks have seen the Variscan collision (late Paleozoic), the opening of the Atlantic / Bay of Biscay (early Cretaceous) and the Alpine orogeny (late Cretaceous to Miocene). Our results show widespread remagnetization(s) carried by magnetite and pyrrhotite in the Silurian-Devonian series of the Pyrenees. The majority of the samples show a post-folding but pre-alpine tilting magnetization. Considering the equatorial inclinations found in such samples, we suggest that they likely acquired their magnetization during the late Carboniferous and early Permian times. Two of the studied sites (located at the western Axial Zone) were subsequently remagnetized at the end of the Alpine orogeny. The paleomagnetic results constrained that the Variscan orogeny was responsible for the main folding event affecting Paleozoic rocks in the Axial Zone, whereas the Alpine orogeny produced the large-scale thrusting and antiformal stacking of these units. In addition, we observed a general clockwise rotational pattern which could be related with the formation of the Cantabrian Orocline and/or rotations associated with the Alpine orogeny. The Silurian-Devonian carbonates are thus useful to understand the tectonic evolution of the Pyrenean mountain range after a systematic combination of paleomagnetism with structural and petrological observations. In contrast, the secondary character of magnetization and complications associated with the Variscan tectonics indicate that a reassessment of Siluro-Devonian poles from the Variscan elsewhere in Europe might be appropriate.

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“…In the Iberian Variscan belt, specifically in the Central Iberian Zone (CIZ), in Spain and Portugal, the magnetic behavior of numerous granites has been analyzed. The Spanish granites are mostly ilmenite-type and have been extensively analyzed by several authors, like Aranguren et al (1996); Olivia-Urcia et al (2012); Porquet et al (2017); Román-Berdiel et al (1995). These authors found K m values between 22µSI and 467µSI.…”

Section: Introductionmentioning

confidence: 97%

Magnetic mineralogy of Variscan granites from northern Portugal: an approach to their petrogenesis and metallogenic potential

Cruz

Sant'Ovaia

Noronha³

2020

GeA

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Northern Portugal is characterized by the occurrence of numerous W hydrothermal deposits spatially associated with granites. The primary goal of this work is to establish a relationship between the magnetic behavior of the granites and the redox conditions during magma genesis, as this can influence the occurrence of mineralizations, namely of W (Mo). To this end, the magnetic mineralogy of the granites of the Lamas de Olo Pluton, a posttectonic pluton in northern Portugal, with associated W (Mo) occurrences was characterized and compared with the magnetic mineralogy of other post-tectonic Variscan plutons. This pluton is composed of different biotite granites: Lamas de Olo, Alto dos Cabeços and Barragem. To better characterize its magnetic behavior, different analytical techniques that complement previous magnetic susceptibility studies were performed. The magnetic mineralogy of Lamas de Olo Pluton was then compared with other post-tectonic Variscan plutons such as the Vila Pouca de Aguiar, Peneda-Gerês and Lavadores-Madalena plutons. The presence of magnetite in some of these granites is important because it points to melt-oxidized conditions not commonly found in Iberian Variscan granites. Our study shows that granite areas where magnetite and/or magnetite/ilmenite coexist are important targets for W (Mo) mineralizations. The results indicate that a few plutons have granites with a complex redox history which leads to the formation of magnetite and ilmenite. Magnetic mineralogy. Variscan granites. Post-D 3 biotite granites. Central Iberian Zone. W-Mo mineralizations. KEYWORDS

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Anisotropy of magnetic susceptibility of the Pyrenean granites

Cited by 15 publications

References 50 publications

Posets pluton: a geochronological piece in the puzzle of the Axial Zone of the Pyrenees

Posets pluton: a geochronological piece in the puzzle of the Axial Zone of the Pyrenees

Paleomagnetism from multi-orogenic terranes is "not a simple game": Pyrenees' Paleozoic warning

Magnetic mineralogy of Variscan granites from northern Portugal: an approach to their petrogenesis and metallogenic potential

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