Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations
On the Argentine Puna two phases of deformation, Late Tertiary and Quaternary, are recognized. Studies of Nazca-South American plate motions indicate convergence towards 77° ± 12° since 10 Ma. Although Tertiary shortening is not parallel to this direction, Quaternary shortening concides with it. Thi...
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1996
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p261_Prezzi http://hdl.handle.net/20.500.12110/paper_00044822_v51_n3_p261_Prezzi |
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paper:paper_00044822_v51_n3_p261_Prezzi2023-06-08T14:25:14Z Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations block rotation palaeomagnetism Tertiary Argentina On the Argentine Puna two phases of deformation, Late Tertiary and Quaternary, are recognized. Studies of Nazca-South American plate motions indicate convergence towards 77° ± 12° since 10 Ma. Although Tertiary shortening is not parallel to this direction, Quaternary shortening concides with it. This situation could be explained by: a) the stress causing the faults changed direction during the Late Cenozoic, or b) the zone containing the older faults was rotated about a vertical axis. Isacks' model for the Bolivian orocline predicts a clockwise regional rotation for the southern limb. Although the model is probably oversimplified, it provides a testable hypothesis. Apalaeomagnetic study, to determine regional or local vertical axis rotations was carried out between 24° 30' and 24° 40' S and 67° 00' and 67° 15' W. Different demagnetization techniques were applied. Most specimens show a multicomponent behavior, although it was possible to isolate pretectonic primary remanent magnetizations that indicate clockwise rotations of approximately 10°-15° of magnitude. 1996 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p261_Prezzi http://hdl.handle.net/20.500.12110/paper_00044822_v51_n3_p261_Prezzi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
block rotation palaeomagnetism Tertiary Argentina |
| spellingShingle |
block rotation palaeomagnetism Tertiary Argentina Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations |
| topic_facet |
block rotation palaeomagnetism Tertiary Argentina |
| description |
On the Argentine Puna two phases of deformation, Late Tertiary and Quaternary, are recognized. Studies of Nazca-South American plate motions indicate convergence towards 77° ± 12° since 10 Ma. Although Tertiary shortening is not parallel to this direction, Quaternary shortening concides with it. This situation could be explained by: a) the stress causing the faults changed direction during the Late Cenozoic, or b) the zone containing the older faults was rotated about a vertical axis. Isacks' model for the Bolivian orocline predicts a clockwise regional rotation for the southern limb. Although the model is probably oversimplified, it provides a testable hypothesis. Apalaeomagnetic study, to determine regional or local vertical axis rotations was carried out between 24° 30' and 24° 40' S and 67° 00' and 67° 15' W. Different demagnetization techniques were applied. Most specimens show a multicomponent behavior, although it was possible to isolate pretectonic primary remanent magnetizations that indicate clockwise rotations of approximately 10°-15° of magnitude. |
| title |
Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations |
| title_short |
Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations |
| title_full |
Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations |
| title_fullStr |
Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations |
| title_full_unstemmed |
Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations |
| title_sort |
palaeomagnetic study of tertiary sedimentary rocks from puna salteña: determination of clockwise rotations |
| publishDate |
1996 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p261_Prezzi http://hdl.handle.net/20.500.12110/paper_00044822_v51_n3_p261_Prezzi |
| _version_ |
1768544618364796928 |