Paleomagnetic evidence for a pre-early Eocene (~50 Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications
The southernmost segment of the Andes of southern Patagonia and Tierra del Fuego forms a ~700 km long orogenic re-entrant with an interlimb angle of ~90° known as Patagonian orocline. No reliable paleomagnetic evidence has been gathered so far to assess whether this great orogenic bend is a primary...
| Published in: | Earth and Planetary Science Letters |
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| Main Authors: | , , , |
| Other Authors: | , , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
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Elsevier B.V.
2009
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| Online Access: | http://hdl.handle.net/2122/5517 https://doi.org/10.1016/j.epsl.2009.11.015 |
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ftingv:oai:www.earth-prints.org:2122/5517 |
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Open Polar |
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Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
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ftingv |
| language |
English |
| topic |
paleomagnetism tectonics Patagonian orocline Fuegian Andes Drake Passage Magallanes belt 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism |
| spellingShingle |
paleomagnetism tectonics Patagonian orocline Fuegian Andes Drake Passage Magallanes belt 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism Maffione, M. Speranza, F. Faccenna, C. Rossello, E. Paleomagnetic evidence for a pre-early Eocene (~50 Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications |
| topic_facet |
paleomagnetism tectonics Patagonian orocline Fuegian Andes Drake Passage Magallanes belt 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism |
| description |
The southernmost segment of the Andes of southern Patagonia and Tierra del Fuego forms a ~700 km long orogenic re-entrant with an interlimb angle of ~90° known as Patagonian orocline. No reliable paleomagnetic evidence has been gathered so far to assess whether this great orogenic bend is a primary arc formed over an articulated paleomargin, or is due to bending of a previously less curved (or rectilinear) chain. Here we report on an extensive paleomagnetic and anisotropy of magnetic susceptibility (AMS) study carried out on 22 sites (298 oriented cores), predominantly sampled in Eocene marine clays from the external Magallanes belt of Tierra del Fuego. Five sites (out of six giving reliable paleomagnetic results) containing magnetite and subordinate iron sulphides yield a positive fold test at the 99% significance level, and document no significant rotation since ~50 Ma. Thus, the Patagonian orocline is either a primary bend, or an orocline formed after Cretaceous–earliest Tertiary rotations. Our data imply that the opening of the Drake Passage between South America and Antarctica (probably causing the onset of Antarctica glaciation and global climate cooling), was definitely not related to the formation of the Patagonian orocline, but was likely the sole consequence of the 32±2 Ma Scotia plate spreading. Well-defined magnetic lineations gathered at 18 sites from the Magallanes belt are sub-parallel to (mostly E–W) local fold axes, while they trend randomly at two sites from the Magallanes foreland. Our and previous AMS data consistently show that the Fuegian Andes were characterized by a N–S compression and northward displacing fold–thrust sheets during Eocene–early Miocene times (50–20 Ma), an unexpected kinematics considering coeval South America–Antarctica relative motion. Both paleomagnetic and AMS data suggest no significant influence from the E–W left-lateral Magallanes–Fagnano strike–slip fault system (MFFS), running a few kilometres south of our sampling sites. We thus speculate that strike–slip fault ... |
| author2 |
Maffione, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Speranza, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Faccenna, C.; Dipartimento di Scienze Geologiche, Università di Roma Tre, Rome, Italy Rossello, E.; CONICET, Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Dipartimento di Scienze Geologiche, Università di Roma Tre, Rome, Italy CONICET, Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina |
| format |
Article in Journal/Newspaper |
| author |
Maffione, M. Speranza, F. Faccenna, C. Rossello, E. |
| author_facet |
Maffione, M. Speranza, F. Faccenna, C. Rossello, E. |
| author_sort |
Maffione, M. |
| title |
Paleomagnetic evidence for a pre-early Eocene (~50 Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications |
| title_short |
Paleomagnetic evidence for a pre-early Eocene (~50 Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications |
| title_full |
Paleomagnetic evidence for a pre-early Eocene (~50 Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications |
| title_fullStr |
Paleomagnetic evidence for a pre-early Eocene (~50 Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications |
| title_full_unstemmed |
Paleomagnetic evidence for a pre-early Eocene (~50 Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications |
| title_sort |
paleomagnetic evidence for a pre-early eocene (~50 ma) bending of the patagonian orocline (tierra del fuego, argentina): paleogeographic and tectonic implications |
| publisher |
Elsevier B.V. |
| publishDate |
2009 |
| url |
http://hdl.handle.net/2122/5517 https://doi.org/10.1016/j.epsl.2009.11.015 |
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ENVELOPE(-62.933,-62.933,-64.883,-64.883) |
| geographic |
Patagonia Drake Passage Argentina Magallanes |
| geographic_facet |
Patagonia Drake Passage Argentina Magallanes |
| genre |
Antarc* Antarctica Drake Passage Tierra del Fuego |
| genre_facet |
Antarc* Antarctica Drake Passage Tierra del Fuego |
| op_relation |
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A.C. demagnetization of rocks: analysis of results. In: Collinson, D.W., Creer, K.M., Runcorn, S.K. (Eds.), Methods in Paleomagnetism. Elsevier, New York, pp. 254–286. http://hdl.handle.net/2122/5517 doi:10.1016/j.epsl.2009.11.015 |
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ftingv:oai:www.earth-prints.org:2122/5517 2023-05-15T14:01:36+02:00 Paleomagnetic evidence for a pre-early Eocene (~50 Ma) bending of the Patagonian orocline (Tierra del Fuego, Argentina): Paleogeographic and tectonic implications Maffione, M. Speranza, F. Faccenna, C. Rossello, E. Maffione, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Speranza, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Faccenna, C.; Dipartimento di Scienze Geologiche, Università di Roma Tre, Rome, Italy Rossello, E.; CONICET, Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Dipartimento di Scienze Geologiche, Università di Roma Tre, Rome, Italy CONICET, Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina 2009-01-15 http://hdl.handle.net/2122/5517 https://doi.org/10.1016/j.epsl.2009.11.015 en eng Elsevier B.V. Earth and Planetary Science Letters Averbuch, O., Mattei, M., Kissel, C., Frizon de Lamotte, D., Speranza, F., 1995. 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A.C. demagnetization of rocks: analysis of results. In: Collinson, D.W., Creer, K.M., Runcorn, S.K. (Eds.), Methods in Paleomagnetism. Elsevier, New York, pp. 254–286. http://hdl.handle.net/2122/5517 doi:10.1016/j.epsl.2009.11.015 restricted paleomagnetism tectonics Patagonian orocline Fuegian Andes Drake Passage Magallanes belt 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism article 2009 ftingv https://doi.org/10.1016/j.epsl.2009.11.015 https://doi.org/10.1029/2000jb000050 2022-07-29T06:05:26Z The southernmost segment of the Andes of southern Patagonia and Tierra del Fuego forms a ~700 km long orogenic re-entrant with an interlimb angle of ~90° known as Patagonian orocline. No reliable paleomagnetic evidence has been gathered so far to assess whether this great orogenic bend is a primary arc formed over an articulated paleomargin, or is due to bending of a previously less curved (or rectilinear) chain. Here we report on an extensive paleomagnetic and anisotropy of magnetic susceptibility (AMS) study carried out on 22 sites (298 oriented cores), predominantly sampled in Eocene marine clays from the external Magallanes belt of Tierra del Fuego. Five sites (out of six giving reliable paleomagnetic results) containing magnetite and subordinate iron sulphides yield a positive fold test at the 99% significance level, and document no significant rotation since ~50 Ma. Thus, the Patagonian orocline is either a primary bend, or an orocline formed after Cretaceous–earliest Tertiary rotations. Our data imply that the opening of the Drake Passage between South America and Antarctica (probably causing the onset of Antarctica glaciation and global climate cooling), was definitely not related to the formation of the Patagonian orocline, but was likely the sole consequence of the 32±2 Ma Scotia plate spreading. Well-defined magnetic lineations gathered at 18 sites from the Magallanes belt are sub-parallel to (mostly E–W) local fold axes, while they trend randomly at two sites from the Magallanes foreland. Our and previous AMS data consistently show that the Fuegian Andes were characterized by a N–S compression and northward displacing fold–thrust sheets during Eocene–early Miocene times (50–20 Ma), an unexpected kinematics considering coeval South America–Antarctica relative motion. Both paleomagnetic and AMS data suggest no significant influence from the E–W left-lateral Magallanes–Fagnano strike–slip fault system (MFFS), running a few kilometres south of our sampling sites. We thus speculate that strike–slip fault ... Article in Journal/Newspaper Antarc* Antarctica Drake Passage Tierra del Fuego Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Patagonia Drake Passage Argentina Magallanes ENVELOPE(-62.933,-62.933,-64.883,-64.883) Earth and Planetary Science Letters 289 1-2 273 286 |