Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?
A paleomagnetic study from the earliest Paleocene Cerros de Montecristo Quartz Monzonite and its Jurassic to uppermost Cretaceous host rock (northern Chile, ∼22°S) provided high-temperature, high-coercivity magnetizations of dominantly reversed polarity. The remanences of the tilted host rock gave a...
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2012
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| LEADER | 13376caa a22010337a 4500 | ||
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| 001 | PAPER-9431 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203921.0 | ||
| 008 | 190411s2012 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-84860354320 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Somoza, R. | |
| 245 | 1 | 0 | |a Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics? |
| 260 | |c 2012 | ||
| 270 | 1 | 0 | |m Somoza, R.; Departamento de Ciencias Geoógicas, FCEyN, Universidad de Buenos AiresArgentina; email: somoza@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Maksaev, V., Munizaga, F., Valencia, V., Barra, F., LA-ICP-MS zircon U-Pb geochronology to constrain the age of post-Neocomian continental deposits of the Cerrillos Formation, Atacama Region, northern Chile: tectonic and metallogenic implications (2009) Andean Geology, 36, pp. 264-287 | ||
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| 504 | |a Ramos, V.A., Seismic ridge subduction and topography: foreland deformation in the Patagonian Andes (2005) Tectonophysics, 399 (1-4), pp. 73-86 | ||
| 504 | |a Ramos, V., Aleman, A., (2000), pp. 635-685. , Tectonic evolution of the Andes. In: Cordani, U., et al. (Eds.), Tectonic Evolution of South America. 31st. International Geological Congress, Rio de Janeiro, Brasil; Ramos, V., Mahlburg Kay, S., Southern Patagonia plateau basalts and deformation: backarc tectimony of ridge collisions (1992) Tectonophysics, 205, pp. 261-282 | ||
| 504 | |a Reutter, K.J., Scheuber, E., Helmcke, D., Structural evidence of orogen-parallel strike slip displacement in the Precordillera of northern Chile (1991) Geologische Rundschau, 80, pp. 135-153 | ||
| 504 | |a Seedorff, E., Dilles, J.H., Proffett, J.M., Jr Einaudi, M.T., Zurcher, L., William, J.A., Stavast, W.J.A., Barton, M.D., (2005), pp. 251-298. , Porphyry-related deposits: characteristics and origin of hypogene features. In: Hedenquist, J., Thompson, J.F., Goldfarb, R.J., Richards, J. (Eds.), 100th Anniversary Volume, Society of Economic Geologists; Sempere, T., Hérail, G., Oller, J., Bonhomme, M., Late Oligocene-early Miocene major tectonic crisis and related basins in Bolivia (1990) Geology, 18, pp. 946-949 | ||
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| 504 | |a Soler, P., Carlier, G., Marocco, R., Evidence for the subduction and underplating of an oceanic plateau beneath the south Peruvian margin during the late Cretaceous: structural implications (1989) Tectonophysics, 163, pp. 13-24 | ||
| 504 | |a Somoza, R., (2005), pp. 681-684. , Cenozoic convergence in western South America: The subduction of the Nazca, Farallon and Phoenix plates. In: 6th International Symposium of Andean Geodynamics, Extended Abstracts, Universitat de Barcelona (Spain), IRD Editions, Paris, France; Somoza, R., Eocene paleomagnetic pole for South America, northward continental motion in the Cenozoic, opening of Drake Passage and Caribbean convergence (2007) Journal of Geophysical Research, 112, pp. B03104 | ||
| 504 | |a Somoza, R., Ghidella, M.E., Convergencia en el margen occidental de América del Sur durante el Cenozoico: subducción de las placas de Nazca, Farallon y Phoenix (2005) Revista de la Asociación Geológica Argentina, 60, pp. 797-809 | ||
| 504 | |a Somoza, R., Zaffarana, C.B., Mid-Cretaceous polar standstill of South America, motion of the Atlantic hotspots and the birth of the Andean cordillera (2008) Earth and Planetary Science Letters, 271, pp. 267-277 | ||
| 504 | |a Somoza, R., Ghidella, M., Late Cretaceous to Recent plate motions in western South America revisited. Earth and Planetary Science Letters, in press, 331-332, 152-163, doi:10.1016/j.epsl.2012.03.003; Taylor, G.K., Grocott, J., Dashwood, B., Gipson, M., Arévalo, C., Implications for crustal rotation and tectonic evolution in the central Andes fore arc: new paleomagnetic results from the Copiapó region of northern Chile, 26°-28°S (2007) Journal of Geophysical Research, 112, pp. B01102 | ||
| 504 | |a Tomlinson, A.J., Blanco, N., Maksaev, V., Dilles, J., Grunder, A.L., Ladino, M., (2001), Geología de la Precordillera Andina de Quebrada Blanca - Chuquicamata, Regiones I y II (20° 30'-22° 30'S). Servicio Nacional de Geología y Minerí; Zaffarana, C.B., Lagorio, S.L., Somoza, R., Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (∼44°S), Patagonian Plateau Basalts (2012) Andean Geology, 39, pp. 53-66 | ||
| 520 | 3 | |a A paleomagnetic study from the earliest Paleocene Cerros de Montecristo Quartz Monzonite and its Jurassic to uppermost Cretaceous host rock (northern Chile, ∼22°S) provided high-temperature, high-coercivity magnetizations of dominantly reversed polarity. The remanences of the tilted host rock gave a negative fold-test and are indistinguishable from the remanences found in the pluton, indicating that the uppermost Cretaceous rocks underwent deformation before intrusion of the earliest Paleocene pluton, thus documenting a K-T deformation at the locality. Although this deformation may be another product of typical subduction-related noncollisional tectonics in the Central Andes, an alternative hypothesis, permitted by plate reconstructions, is that the event was associated with collision of an oceanic plate boundary. This latter hypothesis may also provide a context for several other tectonic events from northern Chile to the Patagonian Andes, wherein deformation would the consequence of a southward migrating triple junction between the latest Maastrichtian and Early Eocene. © 2012 Elsevier Ltd. |l eng | |
| 536 | |a Detalles de la financiación: Fondo Nacional de Desarrollo Científico y Tecnológico, 1970002 | ||
| 536 | |a Detalles de la financiación: PIP 5658 | ||
| 536 | |a Detalles de la financiación: Paleomagnetic routines were in part accomplished at the IAG, Universidade de São Paulo, Brazil, after cordial invitation of Marcia Ernesto. Helpful reviews by Cesar Arriagada and an anonymous reviewer improved an early version of the manuscript. Field work was supported by FONDECYT grant 1970002 , CONICET PIP 5658 and the Servicio Nacional de Geología y Minería-Chile . | ||
| 593 | |a Departamento de Ciencias Geoógicas, FCEyN, Universidad de Buenos Aires, Argentina | ||
| 593 | |a IGEBA-CONICET, Argentina | ||
| 593 | |a Servicio Nacional de Geología y Minería de Chile, Chile | ||
| 593 | |a Instituto de Geología y Minería, Universidad Nacional de Jujuy, Argentina | ||
| 690 | 1 | 0 | |a CENTRAL ANDES |
| 690 | 1 | 0 | |a EARLIEST PALEOCENE DEFORMATION |
| 690 | 1 | 0 | |a NORTHERN CHILE |
| 690 | 1 | 0 | |a RIDGE-COLLISION |
| 690 | 1 | 0 | |a ANDEAN OROGENY |
| 690 | 1 | 0 | |a COLLISION ZONE |
| 690 | 1 | 0 | |a CRETACEOUS |
| 690 | 1 | 0 | |a DEFORMATION MECHANISM |
| 690 | 1 | 0 | |a EOCENE |
| 690 | 1 | 0 | |a HOST ROCK |
| 690 | 1 | 0 | |a HYPOTHESIS TESTING |
| 690 | 1 | 0 | |a MAASTRICHTIAN |
| 690 | 1 | 0 | |a MAGNETIC REVERSAL |
| 690 | 1 | 0 | |a OCEANIC LITHOSPHERE |
| 690 | 1 | 0 | |a PALEOCENE |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a PLATE BOUNDARY |
| 690 | 1 | 0 | |a REMANENT MAGNETIZATION |
| 690 | 1 | 0 | |a TECTONIC RECONSTRUCTION |
| 690 | 1 | 0 | |a TECTONIC SETTING |
| 690 | 1 | 0 | |a TRIPLE JUNCTION |
| 690 | 1 | 0 | |a ANTOFAGASTA |
| 690 | 1 | 0 | |a CALAMA |
| 650 | 1 | 7 | |2 spines |a PLUTON |
| 651 | 4 | |a CHILE | |
| 700 | 1 | |a Tomlinson, A.J. | |
| 700 | 1 | |a Caffe, P.J. | |
| 700 | 1 | |a Vilas, J.F. | |
| 773 | 0 | |d 2012 |g v. 37 |h pp. 208-213 |p J. South Am. Earth Sci. |x 08959811 |w (AR-BaUEN)CENRE-1080 |t Journal of South American Earth Sciences | |
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