Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile

A paleomagnetic and AMS study on Eocene plutonic complexes in the Calama area, northern Chile, reveals high-temperature, high-coercivity magnetizations of dominantly thermoremanent origin and magnetic fabrics controlled by magnetite. The paleomagnetic results indicate that ~. 43. Ma plutons underwen...

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Autor principal: Somoza, R.
Otros Autores: Tomlinson, A.J, Zaffarana, C.B, Singer, S.E, Puigdomenech Negre, C.G, Raposo, M.I.B, Dilles, J.H
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Publicado: Elsevier 2015
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100 1 |a Somoza, R. 
245 1 0 |a Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile 
260 |b Elsevier  |c 2015 
270 1 0 |m Somoza, R.; Departamento de Ciencias Geológicas, Pabellón 2, Ciudad Universitaria, Argentina 
506 |2 openaire  |e Política editorial 
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520 3 |a A paleomagnetic and AMS study on Eocene plutonic complexes in the Calama area, northern Chile, reveals high-temperature, high-coercivity magnetizations of dominantly thermoremanent origin and magnetic fabrics controlled by magnetite. The paleomagnetic results indicate that ~. 43. Ma plutons underwent clockwise tectonic rotation, whereas adjacent ~. 39. Ma plutons did not undergo discernible rotation. This points to a middle Eocene age for the younger tectonic rotations associated with the Central Andean Rotation Pattern in the Chuquicamata-Calama area.The petrofabric in these rocks formed under conditions ranging from purely magmatic (i.e. before full crystallization) to low-temperature solid-state deformation. AMS and paleomagnetism suggest that the plutonic bodies were formed by progressive amalgamation of subvertical magma sheets spanning multiple magnetic polarity chrons. The parallelism between magmatic and tectonic foliations suggests that regional tectonic stress controlled ascent, emplacement and rock deformation during cooling. In this context, we suggest that magma ascent and emplacement in the upper crust likely exploited Mesozoic structures which were locally reactivated in the Eocene. © 2015 Elsevier B.V.  |l eng 
593 |a IGEBA, CONICET-Universidad de Buenos Aires, Argentina 
593 |a Servicio Nacional de Geología y Minería, Santiago, Chile 
593 |a Instituto de Geociências, Universidade de São Paulo, Brazil 
593 |a Department of Geosciences, Oregon State University, Corvallis, OR, United States 
690 1 0 |a CENTRAL ANDES 
690 1 0 |a CHUQUICAMATA 
690 1 0 |a MAGNETIC FABRIC 
690 1 0 |a TECTONIC ROTATIONS 
690 1 0 |a COERCIVE FORCE 
690 1 0 |a DEFORMATION 
690 1 0 |a GEOMAGNETISM 
690 1 0 |a MAGNETIC POLARITY 
690 1 0 |a MAGNETISM 
690 1 0 |a METALS 
690 1 0 |a ROTATION 
690 1 0 |a CENTRAL ANDES 
690 1 0 |a CHUQUICAMATA 
690 1 0 |a INTERNAL STRUCTURE 
690 1 0 |a LOW TEMPERATURES 
690 1 0 |a MAGNETIC FABRICS 
690 1 0 |a REGIONAL TECTONICS 
690 1 0 |a SOLID STATE DEFORMATION 
690 1 0 |a TECTONIC ROTATIONS 
690 1 0 |a TECTONICS 
690 1 0 |a DEFORMATION 
690 1 0 |a EMPLACEMENT 
690 1 0 |a EOCENE 
690 1 0 |a FOLIATION 
690 1 0 |a HIGH TEMPERATURE 
690 1 0 |a MAGNETIC FABRIC 
690 1 0 |a PALEOMAGNETISM 
690 1 0 |a TECTONIC ROTATION 
690 1 0 |a THERMOREMANENT MAGNETIZATION 
690 1 0 |a ANDES 
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 Zaffarana, C.B. 
700 1 |a Singer, S.E. 
700 1 |a Puigdomenech Negre, C.G. 
700 1 |a Raposo, M.I.B. 
700 1 |a Dilles, J.H. 
773 0 |d Elsevier, 2015  |g v. 654  |h pp. 113-130  |p Tectonophysics  |x 00401951  |w (AR-BaUEN)CENRE-81  |t Tectonophysics 
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