Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina
Jurassic volcanism in Patagonia is widespread. Although associated dyke swarms are conspicuous, they have been almost neglected in previous geologic studies of this region. Radiometric, paleomagnetic and magnetic anisotropy studies are reported from a Middle Jurassic basic to intermediate dyke swarm...
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2000
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| LEADER | 14059caa a22010337a 4500 | ||
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| 001 | PAPER-2341 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203144.0 | ||
| 008 | 190411s2000 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0342756787 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Rapalini, A.E. | |
| 245 | 1 | 0 | |a Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina |
| 260 | |c 2000 | ||
| 270 | 1 | 0 | |m Rapalini, A.E.; Lab. de Paleomagnetismo D. Valencio, Departamento de Ciencias Geologicas, Universidad de Buenos Aires, Pabellon 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina; email: rapalini@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a Jurassic volcanism in Patagonia is widespread. Although associated dyke swarms are conspicuous, they have been almost neglected in previous geologic studies of this region. Radiometric, paleomagnetic and magnetic anisotropy studies are reported from a Middle Jurassic basic to intermediate dyke swarm exposed in the Sierra de Mamil Choique (Western Patagonia) in an area of over 350 km2. Two whole-rock K/Ar determinations indicate that these dykes were intruded at around 170 Ma. An anisotropy of magnetic susceptibility (AMS) study on 15 dykes (74 block samples) shows that they carry different kinds of magnetic fabric (both normal and inverse), apparently governed by compositional differences. A paleomagnetic study of these samples suggests that Ti-poor titanomagnetite is the probable carrier to the characteristic remanence. Mean site characteristic directions pass a reversal test (grade C). A paleomagnetic pole, computed by averaging VGPs from each individual dyke, is situated at 70.2°S, 190.4°E (N = 13, α95 = 9.7°), not substantially apart from other Middle Jurassic poles from South America. Further refinement of the Jurassic South American apparent polar wander path is needed to establish whether or not the Mamil Choique dykes were affected by a small tectonic rotation. (C) 2000 Elsevier Science B.V. All rights reserved. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: Fundación Antorchas | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas | ||
| 536 | |a Detalles de la financiación: This study was made possible by financial support of the Fundación Antorchas (Argentina) to A.E.R. Institutional support by the University of Buenos Aires and the Consejo Nacional de Investigaciones Cientı́ficas y Técnicas (CONICET, Argentina) are acknowledged. Paleomagnetic measurements were done at the Laboratorio de Paleomagnetismo Daniel Valencio (University of Buenos Aires). Marcia Ernesto kindly facilitated the instruments at the paleomagnetic laboratory of the Instituto Astronomico e Geofisico (University of Sao Paulo, Brasil) for carrying out the AMS and hysteresis measurements. A.E.R. is particularly indebted to all personnel at that lab for their help in getting used with the equipments. S. Truco collaborated during the field work. Thorough reviews by two anonymous referees substantially improved the final version of the paper. | ||
| 593 | |a Lab. Paleomagnetismo Daniel Valencio, Depto. Cie. Geologicas, FCEyN, U., Buenos Aires, Argentina | ||
| 593 | |a Ctro. Invest. en Recurs. Geologicos, CONICET, Ramirez Velasco 847, 1414, Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a DYKE SWARMS |
| 690 | 1 | 0 | |a JURASSIC |
| 690 | 1 | 0 | |a MAGNETIC FABRIC |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a PATAGONIA |
| 690 | 1 | 0 | |a DIKE |
| 690 | 1 | 0 | |a JURASSIC |
| 690 | 1 | 0 | |a MAGNETIC FABRIC |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a VOLCANISM |
| 651 | 4 | |a SOUTH AMERICA | |
| 651 | 4 | |a ARGENTINA | |
| 700 | 1 | |a Lopez De Luchi, M. | |
| 773 | 0 | |d 2000 |g v. 120 |h pp. 11-27 |k n. 1 |p Phys. Earth Planet. Inter. |x 00319201 |w (AR-BaUEN)CENRE-18 |t Physics of the Earth and Planetary Interiors | |
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