Composite magnetic fabrics and S–C structure in granitic gneiss of Cerro de los Viejos, La Pampa province, Argentina

Tomezzoli, Renata N.; MacDonald, W. D.; Tickyj, Hugo

doi:10.1016/s0191-8141(02)00030-5

Cited by 35 publications

(25 citation statements)

References 18 publications

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“…Investigation of the fabric of the Cerro de los Viejos Complex (Tomezzoli et al, 2003), located close to the Carapacha Basin (Fig. 1), revealed two distinct foliations, s1 and s2.…”

Section: Introductionmentioning

confidence: 99%

Tectonic implications of post-folding Permian magnetizations in the Carapacha Basin, La Pampa province, Argentina

2006

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Paleomagnetic results from Permian clastic and igneous rocks of the Carapacha Basin of the Gondwáides orogenic zone of central Argentina are mainly consistent with results reported previously from the same zone further east, e.g., in the Sierra de la Ventana. Three lithologic entities were analysed: the lower member and upper member of the Carapacha Formation, and an andesite intrusive into the upper member. The directions of their characteristic remanences are similar, differ significantly from the present field direction, and are post-folding. The in situ magnetization directions are moreover consistent with directions expected for late Permian poles of the APWP for South America. The in situ pole for the lower Carapacha Formation is 70• S, 049• E, A95=11• (San Roberto pole); the pole for the upper Carapacha, combined with similar directions from the intrusive, is 64• S, 005• E, A95=5• (Río Curacó pole). These magnetizations imply that the Carapacha Formation, with a minimum age of early Late Permian (about 260 Ma.), was deformed before the end of the Permian. Structural evidence, as well as paleomagnetic, IRM, and AMS experimental results, support the interpretations. The paleogeographic implications of these results are interpreted as a significant counterclockwise movement of Gondwana between the early and the late Permian.

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“…Investigation of the fabric of the Cerro de los Viejos Complex (Tomezzoli et al, 2003), located close to the Carapacha Basin (Fig. 1), revealed two distinct foliations, s1 and s2.…”

Section: Introductionmentioning

confidence: 99%

Tectonic implications of post-folding Permian magnetizations in the Carapacha Basin, La Pampa province, Argentina

2006

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“…In Los Viejos Hill, an AMS systematic sampling was made in a grid perpendicular to the main structures of the body [54]. Unexpectedly, it was found that the K min poles deviate from the poles of the main foliation S 1 by about 25 ( Figure 4).…”

Section: Chadileuvú Block La Pampa Provincementioning

confidence: 97%

Tectonic Insight in the Southwest Gondwana Boundary Based on Anisotropy of Magnetic Susceptibility

Arzadún¹,

Nela²,

Tickyj³

et al. 2018

Tectonics - Problems of Regional Settings

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The anisotropy of magnetic susceptibility (AMS) is an effective tool to measure the rock petrofabric and it allow analyzing the tectonic stress. The southwest boundary of Gondwana in South America is the counter-part of the Cape fold belt of South Africa and its geological evolution is still a subject of debate. Samples of different localities of this sector were analyzed with the AMS technique, from Buenos Aires, La Pampa and Mendoza province. For rocks of Permian age, there is a clear regional magnetic signature indicating a NW-SE elongation direction and a NE-SW shortening. The ASM patterns obtained in the oldest rocks are complex, probably as the result of stress interference in the magnitudes, space and time with different pulses of the orogenic activity developed from the Middle Devonian to the Permian. In the southwest of Gondwana, small continental plates were accreted to the main continent mass during the Middle Devonian. The Permian deformation has been interpreted as the consequence of a paleogeographic re-organization of Gondwana that moves to lowest latitudes to makes the Pangea continent during the Triassic. This younger deformation evidences an orogenic front migration and attenuation to the foreland basin.

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“…However, for granitic gneisses that have undergone a considerable amount of post-emplacement solid state deformation, especially in the Himalaya, the magnetic fabric is difficult to interpret as it can be a combined effect of various deformation episodes (Jayangondaperumal et al, 2010;Tripathi et al, 2012). Past studies have shown that for granitic mylonites, the magnetic fabric may represent an intermediate fabric between the 'S' and 'C' fabric (Aranguren et al, 1996;Tomezzoli et al, 2003) or weakly mimic a fabric developed at later stages (Ono et al, 2010). These studies confirm that for granitic gneisses, the mesoscopic and magnetic foliation may not be concordant and magnetic fabric may result from superposed deformation.…”

Section: Introductionmentioning

confidence: 99%

Composite mesoscopic and magnetic fabrics of the Paleo-Proterozoic Wangtu Gneissic Complex, Himachal Himalaya, India: Implications for ductile deformation and superposed folding of the Himalayan basement rocks

Sen

Dubey

Tripathi

et al. 2012

Journal of Geodynamics

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Composite magnetic fabrics and S–C structure in granitic gneiss of Cerro de los Viejos, La Pampa province, Argentina

Cited by 35 publications

References 18 publications

Tectonic implications of post-folding Permian magnetizations in the Carapacha Basin, La Pampa province, Argentina

Tectonic implications of post-folding Permian magnetizations in the Carapacha Basin, La Pampa province, Argentina

Tectonic Insight in the Southwest Gondwana Boundary Based on Anisotropy of Magnetic Susceptibility

Composite mesoscopic and magnetic fabrics of the Paleo-Proterozoic Wangtu Gneissic Complex, Himachal Himalaya, India: Implications for ductile deformation and superposed folding of the Himalayan basement rocks

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