Artículo

Somoza, R.; Tomlinson, A.J.; Zaffarana, C.B.; Singer, S.E.; Puigdomenech Negre, C.G.; Raposo, M.I.B.; Dilles, J.H. "Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile" (2015) Tectonophysics. 654:113-130
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Abstract:

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.

Registro:

Documento: Artículo
Título:Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile
Autor:Somoza, R.; Tomlinson, A.J.; Zaffarana, C.B.; Singer, S.E.; Puigdomenech Negre, C.G.; Raposo, M.I.B.; Dilles, J.H.
Filiación:IGEBA, CONICET-Universidad de Buenos Aires, Argentina
Servicio Nacional de Geología y Minería, Santiago, Chile
Instituto de Geociências, Universidade de São Paulo, Brazil
Department of Geosciences, Oregon State University, Corvallis, OR, United States
Palabras clave:Central Andes; Chuquicamata; Magnetic fabric; Tectonic rotations; Coercive force; Deformation; Geomagnetism; Magnetic polarity; Magnetism; Metals; Rotation; Central Andes; Chuquicamata; Internal structure; Low temperatures; Magnetic fabrics; Regional tectonics; Solid state deformation; Tectonic rotations; Tectonics; deformation; emplacement; Eocene; foliation; high temperature; magnetic fabric; paleomagnetism; pluton; tectonic rotation; thermoremanent magnetization; Andes; Antofagasta; Calama; Chile
Año:2015
Volumen:654
Página de inicio:113
Página de fin:130
DOI: http://dx.doi.org/10.1016/j.tecto.2015.05.005
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v654_n_p113_Somoza

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Citas:

---------- APA ----------
Somoza, R., Tomlinson, A.J., Zaffarana, C.B., Singer, S.E., Puigdomenech Negre, C.G., Raposo, M.I.B. & Dilles, J.H. (2015) . Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile. Tectonophysics, 654, 113-130.
http://dx.doi.org/10.1016/j.tecto.2015.05.005
---------- CHICAGO ----------
Somoza, R., Tomlinson, A.J., Zaffarana, C.B., Singer, S.E., Puigdomenech Negre, C.G., Raposo, M.I.B., et al. "Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile" . Tectonophysics 654 (2015) : 113-130.
http://dx.doi.org/10.1016/j.tecto.2015.05.005
---------- MLA ----------
Somoza, R., Tomlinson, A.J., Zaffarana, C.B., Singer, S.E., Puigdomenech Negre, C.G., Raposo, M.I.B., et al. "Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile" . Tectonophysics, vol. 654, 2015, pp. 113-130.
http://dx.doi.org/10.1016/j.tecto.2015.05.005
---------- VANCOUVER ----------
Somoza, R., Tomlinson, A.J., Zaffarana, C.B., Singer, S.E., Puigdomenech Negre, C.G., Raposo, M.I.B., et al. Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile. Tectonophysics. 2015;654:113-130.
http://dx.doi.org/10.1016/j.tecto.2015.05.005