Palaeomagnetism of the Late Devonian-Early Carboniferous Achala Batholith, Córdoba, central Argentina: Implications for the apparent polar wander path of Gondwana
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 cooli...
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| 100 | 1 | |a Geuna, S.E. | |
| 245 | 1 | 0 | |a Palaeomagnetism of the Late Devonian-Early Carboniferous Achala Batholith, Córdoba, central Argentina: Implications for the apparent polar wander path of Gondwana |
| 260 | |c 2008 | ||
| 270 | 1 | 0 | |m Geuna, S.E.; CONICET-INGEODAV, Depto. Cs. Geológicas, Facultad de Ciencias Exactas y Naturales, Pabellon 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina; email: geuna@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a 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. |l eng | |
| 536 | |a Detalles de la financiación: IM40-2000 No. 61 | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica, BID 1201/OC-AR-PICT 07-10602 | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas, PIP 5783 | ||
| 536 | |a Detalles de la financiación: This work was partially supported by grants from: ANPCyT (BID 1201/OC-AR-PICT 07-10602), MECyT (IM40-2000 No. 61) and CONICET (PIP 5783). Argentine Geological Survey (SEGEMAR) provided assistance in the fieldwork. F. Gaído and J.C. Candiani contributed to the selection of the sites. Some experiments were carried out in the CSIRO facilities at North Ryde, as part of a CONICET fellowship to SG. Kind assistance of D. Clark, P. Schmidt and M. Huddleston is acknowledged. We are also grateful to S. McEnroe, D. Mutti, and S. Singer for fruitful discussions about the samples. R. Tomezzoli, A. Rapalini, C. Mpodozis, J. Meert and A. Vaughan are thanked for reviews that helped to improve the manuscript. This paper is a contribution to the IGCP Project 471 “Evolution of Western Gondwana during the Late Paleozoic: tectonosedimentary record, paleoclimates, and biological changes”. | ||
| 593 | |a CONICET-INGEODAV, Depto. Cs. Geológicas, Facultad de Ciencias Exactas y Naturales, Pabellon 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina | ||
| 593 | |a Servicio Geológico Minero Argentino (SEGEMAR), Av. Roca 651, Piso 10, C1067ABB Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a APWP |
| 690 | 1 | 0 | |a GRANITE |
| 690 | 1 | 0 | |a LATE DEVONIAN-EARLY CARBONIFEROUS |
| 690 | 1 | 0 | |a PALAEOMAGNETISM |
| 651 | 4 | |a SOUTH AMERICA | |
| 700 | 1 | |a Escosteguy, L.D. | |
| 700 | 1 | |a Miró, R. | |
| 773 | 0 | |d 2008 |g v. 13 |h pp. 227-237 |k n. 2 |p Gondwana Res. |x 1342937X |t Gondwana Research | |
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