Factors affecting the record of strain fabrics at the anisotropy of magnetic susceptibility: West-Central South-Pyrenean cleavage domain (Southern Pyrenees; NE Spain)

Kinematics and strain distribution in an orogen-scale shear zone: Insights from structural analyses and magnetic fabrics in the Gavarnie thrust, Pyrenees

“…In (Lüneburg et al, 1999;Oliva-Urcia et al, 2009;Pueyo-Anchuela et al, 2012). These interpretations are supported by the low susceptibility of the samples, which fit within the typical paramagnetic range (Rochette et al, 1992;Martín-Hernández and Hirt, 2003), the high content of paramagnetic minerals (mainly phyllosilicates) revealed by XRD analysis (Table 1), and the dominance of hyperbolic shapes at first stages in thermomagnetic curves (Fig.…”

“…basement thrust sequence (see Izquierdo-Llavall et al, 2018, where a moderate clockwise rotation of basement thrust sheets is proposed). Changes in the direction of kinematic indicators (namely AMS related to folding) have been also obtained in other areas of the South-Pyrenean Zone (Pueyo-Anchuela et al, 2012;see also Oliva-Urcia et al, 2009;Pocoví et al, 2014). An alternative explanation for the constancy and consistency in the transport direction obtained for the GT is that different, opposite rotations (counter-clockwise and clockwise rotations) of different thrust sheets underlying the GT could sum up to finally obtain the SSW transport direction (this is suggested, for example, in Izquierdo-Llavall et al 2015).…”

Determination of the tectonic evolution from fractures, faults, and calcite twins on the southwestern margin of the Indochina Block

“…One explanation for the different trend is that the belt was rotated from a N‐S direction to a more E‐W orientation by motion along the NW‐SE trending Cenozoic Mae Ping Fault Zone; Tapponnier et al [] proposed sinistral displacement of about 150 km on this fault. However, even after restoring this offset and applying a relative clockwise rotation of about 25°–30° [ Charusiri et al ., ; Cung and Geissman , ; Singsoupho et al , ] to the northern side of the fault, the boundary does not restore to a N‐S orientation [ Anchuela et al , ; Mochales et al , ; Morley et al , ]. Alternatively, the deflection may be due to the original orientation of the continental margins, or possibly due to a poorly documented intra‐Indochina suture, that strikes east‐west and lies close to the southern margin of the Khorat Plateau [ Hutchison , ; Morley et al , ].…”

Rock Magnetic Signature of Heterogeneities Across an Intraplate Basal Contact: An Example From the Northern Apennines

“…The intersection lineation fabric (Graham, 1966; Hirt et al., 2004; Weil & Yonkee, 2009) is plotted at the lower left vertex (Figures 9a and 9b). The magnetic foliation coincides with either the bedding or the cleavage depending on the tectonic overprint degree (Kligfield et al., 1981, 1983; Pueyo Anchuela et al., 2012), as well as the intensity of the original pre‐deformational fabric (Parés & van der Pluijm, 2002; Till et al., 2010). This is also true for shear zones of low finite shear strain, where k 1 is parallel to the S‐C intersection (Casas‐Sainz et al., 2018; Pueyo Anchuela et al., 2010).…”

“…In well‐developed shear‐fabric, the magnetic foliation can be aligned with the shear plane and k 1 can be either parallel or perpendicular to the transport direction (Casas‐Sainz et al., 2018; Román‐Berdiel et al., 2019; Satolli et al., 2020; Ujiie et al., 2000). Moreover, coexisting magnetic subfabrics can result from the combination of different modal mineral composition, grain‐size, and strain partitioning (Borradaile, 1988; Evans et al., 2003; Kusbach et al., 2019; Pueyo Anchuela et al., 2010, 2012). The mineralogical carriers of the AMS, both paramagnetic and ferromagnetic minerals, may form at different deformation stages and respond differently to the deformation mechanisms (e.g., Borradaile & Alford, 1988; Ferré et al., 2004; Martín‐Hernández & Ferré, 2007).…”