Paleomagnetism in the Precordillera of northern Chile (22°30'S): Implications for the history of tectonic rotations in the Central Andes
Widespread clockwise rotations in Mesozoic and Lower Tertiary rocks of northern Chile have been interpreted as the sum of two rotational events separated in time: an early rotation related to local deformation plus a late rotation related to wholesale rotation of northern Chile linked to Late Cenozo...
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2002
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| LEADER | 14350caa a22010337a 4500 | ||
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| 001 | PAPER-5433 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203504.0 | ||
| 008 | 190411s2002 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0036178275 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Somoza, R. | |
| 245 | 1 | 0 | |a Paleomagnetism in the Precordillera of northern Chile (22°30'S): Implications for the history of tectonic rotations in the Central Andes |
| 260 | |c 2002 | ||
| 270 | 1 | 0 | |m Somoza, R.; CONICET - Dept. Ciencias Geologicas, FCEyN, Universidad de Buenos Aires, Pabellón 2, Buenos Aires 1428, Argentina; email: somoza@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Geuna, S., Somoza, R., Vizán, H., Figari, E., Rinaldi, C., Paleomagnetism of Jurassic and Cretaceous rocks in Central Patagonia: A key to constraint the timing of rotations during the breakup of Southwestern Gondwana (2000) Earth Planet. Sci. Lett, 181, pp. 145-160 | ||
| 520 | 3 | |a Widespread clockwise rotations in Mesozoic and Lower Tertiary rocks of northern Chile have been interpreted as the sum of two rotational events separated in time: an early rotation related to local deformation plus a late rotation related to wholesale rotation of northern Chile linked to Late Cenozoic oroclinal bending in the Central Andes. In this paper we report new paleomagnetic data from Cretaceous, upper Oligocene and Miocene sedimentary rocks in the Precordillera of northern Chile. The results suggest that all these rocks acquired their remanence at or close to the time of deposition. The lack of rotation in undeformed lower Miocene strata clearly indicates that clockwise rotations found in underlying, faulted and folded Cretaceous rocks were completed before the Late Cenozoic. Results from nearby localities in deformed upper Oligocene strata would argue for little (∼ 5°) rotation since the late Oligocene. Data from widely separated Miocene localities covering an area of about 5000 km2 in the Calama basin strongly suggest that northern Chile did not undergo significant wholesale rotation during the Late Cenozoic. This, together with previous paleomagnetic evidence against Neogene rigid-body-like rotation of the southern Peruvian forearc, suggests that the curved shape of the Central Andean forearc was not significantly enhanced during the Late Cenozoic. By inference, all of the rotation in most Mesozoic and Lower Tertiary rocks of northern Chile was accomplished in the Cretaceous and/ or Early Cenozoic, when the locus of deformation in the Central Andes was localized in the present forearc region. © 2002 Elsevier Science B.V. All rights reserved. |l eng | |
| 536 | |a Detalles de la financiación: Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica, 1970002 | ||
| 536 | |a Detalles de la financiación: Fundación Antorchas, A-13668/1-13-1999 | ||
| 536 | |a Detalles de la financiación: We thank Herman Rojo Corrales for assistance in the field, and Haroldo Vizán for commenting on an early version of the manuscript. Many of the paleomagnetic measurements of this work were performed in the Instituto Astronômico e Geofisico, Universidade de São Paulo, Brazil, following the cordial invitation of Marcia Ernesto. Thanks to Adrian Hartley and Peter Turner for providing us unpublished data useful for this study. Bob Butler, Randall Forsythe, and Graeme Taylor provided careful reviews. Partly supported by Fundación Antorchas Grant A-13668/1-13-1999 and FONDECYT grant 1970002. [RV] | ||
| 593 | |a CONICET-Departamento De Ciencias Geológicas, FCEyN, Universidad De Buenos Aires, 1428 Buenos Aires, Argentina | ||
| 593 | |a Servicio Nacional De Geología Y Minería, Av. Santa María 0104, Providencia, Santiago, Chile | ||
| 690 | 1 | 0 | |a CENTRAL ANDES |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a PRECORDILLERA |
| 690 | 1 | 0 | |a ROTATION |
| 690 | 1 | 0 | |a CRETACEOUS |
| 690 | 1 | 0 | |a FOREARC BASIN |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a TECTONIC ROTATION |
| 690 | 1 | 0 | |a TERTIARY |
| 651 | 4 | |a CHILE | |
| 651 | 4 | |a CHILE | |
| 700 | 1 | |a Tomlinson, A. | |
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