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dc.contributor.author
Rossel, Pablo
dc.contributor.author
Gianni, Guido Martin
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Reinoso, Valeria
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Fanning, C. Mark
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Ducea, Mihai N.
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Muñoz, Tamara
dc.contributor.author
Salvat, Daniela
dc.date.available
2024-01-08T17:39:32Z
dc.date.issued
2023-02
dc.identifier.citation
Rossel, Pablo; Gianni, Guido Martin; Reinoso, Valeria; Fanning, C. Mark; Ducea, Mihai N.; et al.; Origin of Late Triassic Granitoids of the Coastal Cordillera of Southern Central Chile (34°–37°S): Multi-Isotopic Evidence of Slab Tearing Effects on Pre-Andean Magmagenesis; American Geophysical Union; Tectonics; 42; 2; 2-2023; 1-22
dc.identifier.issn
0278-7407
dc.identifier.uri
http://hdl.handle.net/11336/222899
dc.description.abstract
The Coastal Cordillera of Central Chile (34°–37°S) holds a series of Late Triassic granitoids classically interpreted as early Andean subduction-related magmatism based on their arc-like geochemical signature. Here, we present geochemical, isotopic, and geochronological data and a tomotectonic analysis that challenge this idea indicating a local interruption of the normal subduction process likely associated with a slab-tearing event. Our results suggest that the source of the magmas is related to melting of asthenospheric mantle and crustal rocks of a metasedimentary Paleozoic complex. We suggest that partial melting of these sources was triggered by a slab tear-related asthenosphere upwelling producing high-silica S/I- and S-Type granites of the Constitución and Hualpén areas, and anorogenic A-Type granitoids in Cobquecura area. Also, partial melting of a metasomatized asthenospheric mantle plus continental crust that experienced previous high-temperature hydrothermal alteration would have generated high-silica magmas with low δ18O, high Pb, CHUR-like 87Sr/86Sr, and 143Nd/144Nd ratios that originated La Estrella Granite. Our results offer an alternative explanation for the existence of subtle magmatic arc-like geochemical signatures in the study area and support a segmentation of the active margin during the Late Triassic. The widespread upper-plate magmatic record of slab-tearing, spanning the Coastal Cordillera of Central Chile to the intraplate Neuquén basin in Argentina, and the lower mantle record of a slab gap, detected in ours and previous tomotectonic analyses, make the Late Triassic slab-tearing event in southwestern Pangea the most robustly constrained pre-Cenozoic slab tear process so far.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Geophysical Union
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
GRANITES
dc.subject
ISOTOPE CHEMISTRY
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PRE-ANDEAN
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SLAB TEAR
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UPPER TRIASSIC
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ZIRCON GEOCHRONOLOGY
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Geología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Origin of Late Triassic Granitoids of the Coastal Cordillera of Southern Central Chile (34°–37°S): Multi-Isotopic Evidence of Slab Tearing Effects on Pre-Andean Magmagenesis
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-01-08T14:21:02Z
dc.journal.volume
42
dc.journal.number
2
dc.journal.pagination
1-22
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Rossel, Pablo. Universidad Andrés Bello; Chile
dc.description.fil
Fil: Gianni, Guido Martin. Universidad Nacional de San Juan; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
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Fil: Reinoso, Valeria. Universidad Andrés Bello; Chile
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Fil: Fanning, C. Mark. The Australian National University; Australia
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Fil: Ducea, Mihai N.. University of Arizona; Estados Unidos
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Fil: Muñoz, Tamara. Universidad Andrés Bello; Chile
dc.description.fil
Fil: Salvat, Daniela. Universidad Andrés Bello; Chile
dc.journal.title
Tectonics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1029/2022TC007354
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