Anisotropy of magnetic susceptibility as a strain gauge in the Flamanville granite, NW France
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Cited by (48)
Does tectonic deformation control episodic continental arc magmatism? Evidence from granitic magnetic fabrics (AMS)
2022, Gondwana ResearchCitation Excerpt :AMS analytical outputs include the corrected degree of anisotropy (Pj), describing the deviation of the AMS fabric from a sphere. Given our conclusion that AMS fabrics dominantly record tectonic strain, it would be appealing if this value provided another proxy for the degree of syn-magmatic strain (Cogné and Perroud, 1988). However, no apparent correlation exists between Pj and the qualitative classification of deformation (Fig. 15a and Fig. 15c) for the LCIS or Sierra Nevada.
Spatial-temporal heterogeneity of magma emplacement process and its constraints on localization of associated orebody: A case study in the Shizishan orefield of the Tongling Ore Cluster, East China
2021, Ore Geology ReviewsCitation Excerpt :Seventy-eight percent of the magnetic foliation of G-I is characterized by a NE-SW strike with steep or high-angle southeastward dip (Fig. 10 and Table 1). This pattern of relatively consistent strike and dip of the magnetic foliation in the Dongguashan quartz diorite stock is different from previous AMS studies on other stocks around the world, which usually present a circular array of inward dipping magnetic foliations with strike parallel to the stock boundary (Cogné and Perroud, 1988; Hrouda and Lanza, 1989; Romeo et al., 2008; He et al., 2009; Pina et al., 2010). Whereas the trend and plunge of magnetic lineation of these sites are highly variable (Fig. 10c and 10d), which is a typical feature for the fabric developed in a stock (Cogné and Perroud, 1988; Hrouda and Lanza, 1989; de Saint-Blanquat, et al., 2001).
Internal structure of the Paleoarchean Mt Edgar dome, Pilbara Craton, Western Australia
2021, Precambrian ResearchCitation Excerpt :This study includes a total of 1,150 core specimens spread across 137 stations throughout the Mt Edgar dome. AMS is a proven tool for studying magmatic and solid-state foliation and lineation in granitic rocks (e.g., Borradaile, 1988; Cogné and Perroud, 1988; Bouchez et al., 1990; Vigneresse and Bouchez, 1997; Benn et al., 1998; Borradaile and Gauthier, 2003; Titus et al., 2005; Čečys and Benn, 2007; Kruckenberg et al., 2010). It is sufficiently sensitive to provide robust three-dimensional data for rocks with weak visible anisotropy, which makes it a useful petrophysical technique in situations – such as the Mt Edgar dome – where mesoscopic lineation is difficult to identify in the field due to rounded outcrop geometry and the overall weakness of fabric.
Current challenges and future developments in magnetic fabric research
2020, TectonophysicsInterpreting magnetic fabrics in amphibole-bearing rocks
2018, TectonophysicsCitation Excerpt :The maximum susceptibility (k1 or magnetic lineation) is typically parallel to lineation, and the minimum susceptibility (k3, or pole to magnetic foliation) normal to the foliation plane (Balsley and Buddington, 1960). Numerous studies report that the degree of magnetic anisotropy increases with progressive deformation (e.g. Cogné and Perroud, 1988; Graham, 1966; Hirt et al., 1988; Kligfield et al., 1977; Kneen, 1976; Rathore, 1979; Wood et al., 1976). However, these empirical relationships are further influenced by mineralogy (Borradaile and Henry, 1997; Owens, 1974).