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Abstract:

The Achala Batholith (31°30′S, 64°45′W, Córdoba, Argentina) is a major magmatic complex of the Sierras Pampeanas, emplaced as a post-orogenic pluton in a metamorphic-plutonic basement. It is mainly a porphyritic to coarse-grained equigranular monzogranite, with crystallization age of ∼ 370 and cooling age of ∼ 340 Ma, presently exposed as asymmetric, eastward-tilted blocks. Forty-three sites were sampled in the Achala monzogranite. Overall, it is weakly magnetic, with a mean magnetic susceptibility of 15 × 10- 5 (SI). Twenty-two sites showed unstable magnetic behaviour. The remaining 21 sites have haematite as magnetic carrier of a stable remanence. The ilmeno-haematite appears as an accessory mineral, with exsolved intergrowths of (haemo)ilmenite. Thermal demagnetisation up to 620-640 °C isolated steeply-dipping, dual-polarity remanence directions. The palaeomagnetic pole is located at 56°S, 307°E (N = 18, A95 10.7, K 11). The remanence was locked on cooling, over a range of temperatures from magnetic ordering to exsolution of ilmenite-haematite (∼ 600 to 390 °C). The pole better coincides with the 370-360 Ma segment of the Gondwana apparent polar wander path, suggesting that remanence was acquired quickly. The Achala pole matches a complex mid-Palaeozoic apparent polar wander path ("Y-type") for Gondwana, which may involve rapid movement, true polar wander episodes and/or continental collisions before the final amalgamation of Pangea. © 2007 International Association for Gondwana Research.

Registro:

Documento: Artículo
Título:Palaeomagnetism of the Late Devonian-Early Carboniferous Achala Batholith, Córdoba, central Argentina: Implications for the apparent polar wander path of Gondwana
Autor:Geuna, S.E.; Escosteguy, L.D.; Miró, R.
Filiación:CONICET-INGEODAV, Depto. Cs. Geológicas, Facultad de Ciencias Exactas y Naturales, Pabellon 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Servicio Geológico Minero Argentino (SEGEMAR), Av. Roca 651, Piso 10, C1067ABB Buenos Aires, Argentina
Palabras clave:APWP; Granite; Late Devonian-Early Carboniferous; Palaeomagnetism; South America
Año:2008
Volumen:13
Número:2
Página de inicio:227
Página de fin:237
DOI: http://dx.doi.org/10.1016/j.gr.2007.05.006
Título revista:Gondwana Research
Título revista abreviado:Gondwana Res.
ISSN:1342937X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v13_n2_p227_Geuna

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Citas:

---------- APA ----------
Geuna, S.E., Escosteguy, L.D. & Miró, R. (2008) . Palaeomagnetism of the Late Devonian-Early Carboniferous Achala Batholith, Córdoba, central Argentina: Implications for the apparent polar wander path of Gondwana. Gondwana Research, 13(2), 227-237.
http://dx.doi.org/10.1016/j.gr.2007.05.006
---------- CHICAGO ----------
Geuna, S.E., Escosteguy, L.D., Miró, R. "Palaeomagnetism of the Late Devonian-Early Carboniferous Achala Batholith, Córdoba, central Argentina: Implications for the apparent polar wander path of Gondwana" . Gondwana Research 13, no. 2 (2008) : 227-237.
http://dx.doi.org/10.1016/j.gr.2007.05.006
---------- MLA ----------
Geuna, S.E., Escosteguy, L.D., Miró, R. "Palaeomagnetism of the Late Devonian-Early Carboniferous Achala Batholith, Córdoba, central Argentina: Implications for the apparent polar wander path of Gondwana" . Gondwana Research, vol. 13, no. 2, 2008, pp. 227-237.
http://dx.doi.org/10.1016/j.gr.2007.05.006
---------- VANCOUVER ----------
Geuna, S.E., Escosteguy, L.D., Miró, R. Palaeomagnetism of the Late Devonian-Early Carboniferous Achala Batholith, Córdoba, central Argentina: Implications for the apparent polar wander path of Gondwana. Gondwana Res. 2008;13(2):227-237.
http://dx.doi.org/10.1016/j.gr.2007.05.006