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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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v120_n1_p11_Rapalini http://hdl.handle.net/20.500.12110/paper_00319201_v120_n1_p11_Rapalini |
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paper:paper_00319201_v120_n1_p11_Rapalini2023-06-08T14:58:51Z Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina Rapalini, Augusto Ernesto Dyke swarms Jurassic Magnetic fabric Paleomagnetism Patagonia South America dike Jurassic magnetic fabric paleomagnetism volcanism 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 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. Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v120_n1_p11_Rapalini http://hdl.handle.net/20.500.12110/paper_00319201_v120_n1_p11_Rapalini |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Dyke swarms Jurassic Magnetic fabric Paleomagnetism Patagonia South America dike Jurassic magnetic fabric paleomagnetism volcanism Argentina |
| spellingShingle |
Dyke swarms Jurassic Magnetic fabric Paleomagnetism Patagonia South America dike Jurassic magnetic fabric paleomagnetism volcanism Argentina Rapalini, Augusto Ernesto Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina |
| topic_facet |
Dyke swarms Jurassic Magnetic fabric Paleomagnetism Patagonia South America dike Jurassic magnetic fabric paleomagnetism volcanism Argentina |
| description |
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. |
| author |
Rapalini, Augusto Ernesto |
| author_facet |
Rapalini, Augusto Ernesto |
| author_sort |
Rapalini, Augusto Ernesto |
| title |
Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina |
| title_short |
Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina |
| title_full |
Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina |
| title_fullStr |
Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina |
| title_full_unstemmed |
Paleomagnetism and magnetic fabric of Middle Jurassic dykes from Western Patagonia, Argentina |
| title_sort |
paleomagnetism and magnetic fabric of middle jurassic dykes from western patagonia, argentina |
| publishDate |
2000 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v120_n1_p11_Rapalini http://hdl.handle.net/20.500.12110/paper_00319201_v120_n1_p11_Rapalini |
| work_keys_str_mv |
AT rapaliniaugustoernesto paleomagnetismandmagneticfabricofmiddlejurassicdykesfromwesternpatagoniaargentina |
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