dc.creator | Dahlquist, Juan Andrés | |
dc.creator | Alasino, Pablo Horacio | |
dc.creator | Basei, Miguel A.S. | |
dc.creator | Morales Camera, Matías Martín | |
dc.creator | Macchioli Grande, Marcos Simón | |
dc.creator | Campos Neto, Mario da Costa | |
dc.date.accessioned | 2019-11-08T17:03:51Z | |
dc.date.accessioned | 2022-10-15T01:18:47Z | |
dc.date.available | 2019-11-08T17:03:51Z | |
dc.date.available | 2022-10-15T01:18:47Z | |
dc.date.created | 2019-11-08T17:03:51Z | |
dc.date.issued | 2018-10 | |
dc.identifier | Dahlquist, Juan Andrés; Alasino, Pablo Horacio; Basei, Miguel A.S.; Morales Camera, Matías Martín; Macchioli Grande, Marcos Simón; et al.; Petrological, geochemical, isotopic, and geochronological constraints for the Late Devonian–Early Carboniferous magmatism in SW Gondwana (27–32°LS): An example of geodynamic switching; Springer; International Journal of Earth Sciences; 107; 7; 10-2018; 2575-2603 | |
dc.identifier | 1437-3254 | |
dc.identifier | http://hdl.handle.net/11336/88345 | |
dc.identifier | CONICET Digital | |
dc.identifier | CONICET | |
dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/4329153 | |
dc.description.abstract | We report a study integrating 13 new U–Pb LA-MC-ICP-MS zircon ages and Hf-isotope data from dated magmatic zircons together with complete petrological and whole-rock geochemistry data for the dated granitic rocks. Sample selection was strongly based on knowledge reported in previous investigations. Latest Devonian–Early Carboniferous granite samples were collected along a transect of ~ 900 km, from the inner continental region (present-day Eastern Sierras Pampeanas) to the magmatic arc (now Western Sierras Pampeanas and Frontal Cordillera). Based on these data together with ca. 100 published whole-rock geochemical analyses we conclude that Late Devonian–Early Carboniferous magmatism at this latitude represents continuous activity (ranging from 322 to 379 Ma) on the pre-Andean margin of SW Gondwana, although important whole-rock and isotopic compositional variations occurred through time and space. Combined whole-rock chemistry and isotope data reveal that peraluminous A-type magmatism started in the intracontinental region during the Late Devonian, with subsequent development of synchronous Carboniferous peraluminous and metaluminous A-type magmatism in the retro-arc region and calc-alkaline magmatism in the western paleomargin. We envisage that magmatic evolution was mainly controlled by episodic fluctuations in the angle of subduction of the oceanic plate (between flat-slab and normal subduction), supporting a geodynamic switching model. Subduction fluctuations were relatively fast (ca. 7 Ma) during the Late Devonian and Early Carboniferous, and the complete magmatic switch-off and switch-on process lasted for ~ 57 Ma. Hf TDM values of zircon (igneous and inherited) from some Carboniferous peraluminous A-type granites in the retro-arc suggest that Gondwana continental lithosphere formed during previous orogenies was partly the source of the Devonian–Carboniferous granitic magmas, thus precluding the generation of the parental magmas from exotic terranes. | |
dc.language | eng | |
dc.publisher | Springer | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/http://link.springer.com/10.1007/s00531-018-1615-9 | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s00531-018-1615-9 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | CALC-ALKALINE, METALUMINOUS AND STRONGLY PERALUMINOUS A-TYPE GRANITES | |
dc.subject | DEVONIAN; CARBONIFEROUS TIME | |
dc.subject | GEODYNAMICS SWITCHING MODEL | |
dc.subject | PRE-ANDEAN MARGIN OF SW GONDWANA | |
dc.title | Petrological, geochemical, isotopic, and geochronological constraints for the Late Devonian–Early Carboniferous magmatism in SW Gondwana (27–32°LS): An example of geodynamic switching | |
dc.type | info:eu-repo/semantics/article | |
dc.type | info:ar-repo/semantics/artículo | |
dc.type | info:eu-repo/semantics/publishedVersion | |