Author | dc.contributor.author | Calderón, M. | |
Author | dc.contributor.author | Fosdick, J. C. | es_CL |
Author | dc.contributor.author | Warren, C. | es_CL |
Author | dc.contributor.author | Massonne, H. J. | es_CL |
Author | dc.contributor.author | Fanning, C. M. | es_CL |
Author | dc.contributor.author | Fadel Cury, L. | es_CL |
Author | dc.contributor.author | Schwanethal, J. | es_CL |
Author | dc.contributor.author | Fonseca, P. E. | es_CL |
Author | dc.contributor.author | Galaz, Gaspar | es_CL |
Author | dc.contributor.author | Gaytán, D. | es_CL |
Author | dc.contributor.author | Hervé Allamand, Francisco | es_CL |
Admission date | dc.date.accessioned | 2012-05-25T15:40:17Z | |
Available date | dc.date.available | 2012-05-25T15:40:17Z | |
Publication date | dc.date.issued | 2012 | |
Cita de ítem | dc.identifier.citation | Tectonophysics 524–525 (2012) 165–185 | es_CL |
Identifier | dc.identifier.other | doi:10.1016/j.tecto.2011.12.034 | |
Identifier | dc.identifier.uri | https://repositorio.uchile.cl/handle/2250/125606 | |
Abstract | dc.description.abstract | The Canal de las Montañas Shear Zone (CMSZ), southern Patagonian Andes (51–52°S), is a low-grade
mylonite belt generated from felsic ignimbritic, pelitic and basaltic protoliths of the Late Jurassic–Early
Cretaceous Rocas Verdes basin. The different types of rock fabrics across the CMSZ are thought to be associated
with relatively intermediate and high strain conditions, characterized by the development of a narrow
western belt of S–C´-type mylonites and phyllonites interpreted as the metamorphic sole thrust of the
Sarmiento Ophiolitic Complex. Highly strained rocks of the CMSZ display a reverse, continent-ward tectonic
transport, with a minor dextral component of shearing. Transitional pumpellyite–actinolite and upper
greenschist facies metamorphic conditions at ca. 5–6 kbar and 230–260 °C indicate that the primary shearing
event occurred in a subduction zone setting. In-situ 40Ar/39Ar laserprobe chronology yielded ages of ca. 85 Ma
on syntectonic phengite which are interpreted as representing cooling synchronous with mica crystallization
during the main compressive deformational event. The 78–81 Ma U–Pb zircon crystallization ages of crosscutting
plutonic and hypabyssal rocks and 40Ar/39Ar amphibole age of ca.79 Ma from lamprophyric dikes
within the fold-thrust belt constrain an upper age limit of the ophiolite tectonic emplacement deformation. | es_CL |
Patrocinador | dc.description.sponsorship | This work was supported by Initiation Fondecyt grant 11075000
to M.C., and the international collaboration grants of the GRICESCONICYT
(José Munhá and M.C.) and the BMBF-CONICYT (H.-J.M.
and F.H) programs. This research paper is a contribution of Anillo
Project ACT-105 of CONICYT and PBCYT. | es_CL |
Lenguage | dc.language.iso | en | es_CL |
Publisher | dc.publisher | Elsevier | es_CL |
Keywords | dc.subject | Patagonian Andes | es_CL |
Título | dc.title | The low-grade Canal de las Montañas Shear Zone and its role in the tectonic emplacement of the Sarmiento Ophiolitic Complex and Late Cretaceous Patagonian Andes orogeny, Chile | es_CL |
Document type | dc.type | Artículo de revista | |