Paleomagnetic study of Cambrian-Ordovician rocks in the Eastern Precordillera of Argentina: Some constraints on the Andean uplift of this block
A paleomagnetic study on several carbonatic units (limestones to dolomites) of the Argentine Precordillera, spanning the Middle Cambrian to Arenig, is reported. Sampling was done at 23 sites (140 samples) in five localities of the Eastern Precordillera of San Juan province: Zonda (1), Juan Pobre (2)...
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2000
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| LEADER | 12267caa a22009617a 4500 | ||
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| 001 | PAPER-20822 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518205214.0 | ||
| 008 | 190411s2000 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0034476949 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Rapalini, A.E. | |
| 245 | 1 | 0 | |a Paleomagnetic study of Cambrian-Ordovician rocks in the Eastern Precordillera of Argentina: Some constraints on the Andean uplift of this block |
| 260 | |c 2000 | ||
| 270 | 1 | 0 | |m Rapalini, A.E.; CONICET/Dept. Ciencias Geologicas, FCEyN, Univ. de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina; email: rapalini@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Ramos, V.A., Jordan, T.E., Allmendinger, R.W., Mpodozis, C., Kay, S.M., Cortes, J.M., Palma, M., Paleozoic terranes of the Central Argentine-Chilean Andes (1986) Tectonics, 5 (6), pp. 855-880 | ||
| 504 | |a Rapalini, A.E., Astini, R.A., Paleomagnetic confirmation of the Laurentian origin of the Argentine Precordillera (1998) Earth Planet. Sci. Lett, 155, pp. 1-14 | ||
| 504 | |a Rapalini, A.E., Tarling, D.H., Multiple magnetizations in the Cambro-Ordovician carbonate platform of the Argentine Precordillera and their tectonic implications (1993) Tectonophysics, 227, pp. 49-62 | ||
| 504 | |a Smalley, A., Basement seismicity beneath the Andean Precordillera thin-skinned thrust belt and implications for crustal and lithospheric behavior (1993) Tectonics, 12 (1), pp. 63-76 | ||
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| 504 | |a Truco, S., Rapalini, A.E., New evidence of a widespread Permian remagnetizing event in the central andean zone of Argentina (1996) 3rd Int. Symp. on Andean Geodynamics, pp. 799-802. , St. Malo, France. Ext. Abstr | ||
| 504 | |a von Gosen, W., Structural evolution of the Argentine Precordillera: The Rio San Juan section (1992) J. Struct. Geol, 14 (6), pp. 643-667 | ||
| 504 | |a Von Gosen, W., Buggisch, W., A west-east transect across the Precordillera (Argentina) (1992) Zbl. Geol. Palaont, pp. 1597-1614 | ||
| 504 | |a Zapata, T.R., Allmendinger, R.W., Growth stratal records of instantaneous and progressive limb rotation in the Precordillera thrust belt and Bermejo basin (1996) Tectonics, 15 (5), pp. 1065-1083. , Argentina | ||
| 520 | 3 | |a A paleomagnetic study on several carbonatic units (limestones to dolomites) of the Argentine Precordillera, spanning the Middle Cambrian to Arenig, is reported. Sampling was done at 23 sites (140 samples) in five localities of the Eastern Precordillera of San Juan province: Zonda (1), Juan Pobre (2) and La Flecha (3) creeks, Loma Redonda (4) and Cerro Pedernal de los Berros (5). Standard AF and thermal demagnetization indicated two different magnetic behaviors. Samples from localities 1 and 2 showed a single, post-tectonic magnetic component attributed to a Recent viscous or chemical remagnetization. Samples from localities 3 to 5 showed two magnetic components: a low unblocking temperature (350°C) magnetization coincident with that found at the previous localities and a high temperature one (up to 500°C). This second component was also found to be post-folding (post-Devonian?) and its in situ mean direction is Dec: 277.1°, Inc: 69.4, α95: 9.3°, N = 10. This is not consistent with any expected direction for the study area between Carboniferous and Recent times. It is therefore inferred that the rocks carrying it underwent substantial tectonic rotation since its recording. Comparison with the magnetization carried by similar Early Ordovician limestones in the Central Precordillera and the San Rafael Block, and assigned to a Permian remagnetizing event, suggests that the same process affected the carbonatic rocks in the Eastern Precordillera and, therefore, the age of the component is likely Permian. Restoration of the in situ mean direction to the expected direction for a Permian remagnetization can be obtained by a 40° ccw rotation around an axis plunging 30° to N30°E. This is compatible with uplifting of the Eastern Precordillera as a series of quasi-rigid blocks along a major E dipping N to NE backthrust during the Andean orogeny. © 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: Consejo Nacional de Investigaciones Científicas y Técnicas | ||
| 536 | |a Detalles de la financiación: The authors wish to thank the University of Buenos Aires and the Consejo Nacional de Investigaciones Cientı́ficas y Técnicas (CONICET, Argentina) for their financial support. UBACyT grants EX135 and AX02 financed the investigations. C.M. Conti was very helpful during the field work. Reviews by V. Ramos and P. Roperch substantially improved the final version. V. Ramos and J.M. Cortés are acknowledged for discussions that permitted a better comprehension of the structural geology of the area. The ubiquitous and prolific work of Myrl Beck Jr. in the South American Andes inspired many of his South American colleagues. | ||
| 593 | |a CONICET, Depto. De Ciencias Geológicas, Ciudad Universitaria, 1428 Buenos Aires, Argentina | ||
| 593 | |a CRICYT, CC 131, 5500 Mendoza, Argentina | ||
| 593 | |a Instituto Astronomico E Geofisico, Universidade De Sao Paulo, Sao Paulo, Brazil | ||
| 690 | 1 | 0 | |a ANDES |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a PRECORDILLERA |
| 690 | 1 | 0 | |a REMAGNETIZATION |
| 690 | 1 | 0 | |a UPLIFT |
| 690 | 1 | 0 | |a CAMBRIAN |
| 690 | 1 | 0 | |a CORDILLERA |
| 690 | 1 | 0 | |a ORDOVICIAN |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a UPLIFT |
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a ARGENTINA | |
| 700 | 1 | |a Bordonaro, O. | |
| 700 | 1 | |a Berquo, T.S. | |
| 773 | 0 | |d 2000 |g v. 326 |h pp. 173-184 |k n. 1-2 |p Tectonophysics |x 00401951 |w (AR-BaUEN)CENRE-81 |t Tectonophysics | |
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