Geocronología U-Pb e isótopos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile.

Deckart, Katja; Hervé, Francisco; Fanning, Christopher; Ramírez, Valeria; Calderón, Mauricio; Godoy, Estanislao

doi:10.5027/andgeov41n1-a03

Cited by 32 publications

(14 citation statements)

References 32 publications

(33 reference statements)

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“…We prefer the concept of Chaitenia as an (initially) offshore Devonian island arc as suggested in Hervé et al, (2016) as the colliding body. A post-470 Ma depositional age for the majority of these samples is established by the U-Pb data for detrital zircons, but in some cases a mid-Paleozoic age is confirmed by the fact that they are intruded by igneous rocks dated at 306±2 Ma (Cuesta de Rahue), penecontemporaneous with the Pennsylvanian Coastal Batholith of Chile (Deckart et al, 2014), and of the Devonian age in the granitic body intruding the rocks of the Llanquihue metamorphic complex (McDonough et al, written communication, 2001) at the ENAP borehole Rahue-2.…”

Section: Devonian Zircon Agesmentioning

confidence: 91%

The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia

Hervé

Calderón

Fanning

et al. 2018

andgeo

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Previous work has shown that Devonian magmatism in the southern Andes occurred in two contemporaneous belts: one emplaced in the continental crust of the North Patagonian Massif and the other in an oceanic island arc terrane to the west, Chaitenia, which was later accreted to Patagonia. The country rocks of the plutonic rocks consist of metasedimentary complexes which crop out sporadically in the Andes on both sides of the Argentina-Chile border, and additionally of pillow metabasalts for Chaitenia. Detrital zircon SHRIMP U-Pb age determinations in 13 samples of these rocks indicate maximum possible depositional ages from ca. 370 to 900 Ma, and the case is argued for mostly Devonian sedimentation as for the fossiliferous Buill slates. Ordovician, Cambrian-late Neoproterozoic and “Grenville-age” provenance is seen throughout, except for the most westerly outcrops where Devonian detrital zircons predominate. Besides a difference in the Precambrian zircon grains, 76% versus 25% respectively, there is no systematic variation in provenance from the Patagonian foreland to Chaitenia, so that the island arc terrane must have been proximal to the continent: its deeper crust is not exposed but several outcrops of ultramafic rocks are known. Zircons with devonian metamorphic rims in rocks from the North Patagonian Massif have no counterpart in the low metamorphic grade Chilean rocks. These Paleozoic metasedimentary rocks were also intruded by Pennsylvanian and Jurassic granitoids.

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Section: Devonian Zircon Agesmentioning

confidence: 91%

The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia

Hervé

Calderón

Fanning

et al. 2018

andgeo

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“…Furthermore, zircons of late Carboniferous age have been reported in Paleozoic units of the Coastal Cordillera of central Chile (ca. 300-320 Ma, U-Pb, Deckart et al, 2014), but they seem to be too far away to explain their influence in the Alto Tunuyán Basin.…”

Section: Other Unclear Sourcesmentioning

confidence: 99%

Provenance of the Miocene Alto Tunuyán Basin (33°40′S, Argentina) and its implications for the evolution of the Andean Range: Insights from petrography and U–Pb LA–ICPMS zircon ages

et al. 2016

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“…Sediments of late Paleozoic age have also been identified in red clastic sequences of Kimmeridgian/Tithonian age in northern Chile, and their likely sources attributed to numerous Carboniferous to Permian intrusions that crop out in the Principal Cordillera (28-29°S; Oliveros et al, 2012). At the latitude of the present study, no Paleozoic plutonic rocks older than 320 Ma have been reported in the Chilean territory (Deckart et al, 2014). Given the large size of the granitic clasts, their source must have been an unexposed extension of Carboniferous granitoid located near the Chile-Argentina border, rather than the presentday nearest outcrops of Paleozoic granitoids in the Coastal Cordillera between 33° and 38°S.…”

Section: Age and Provenance Of The Río Damas-tordillomentioning

confidence: 82%

El volcanismo jurásico superior de la Formación Río Damas-Tordillo (33°-35,5°S): antecedentes su sobre petrogénesis, cronología, proveniencia e implicancias tectónicas.

Rossel

Oliveros

Mescua

et al. 2014

Andgeo

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ABSTRACT. The uppermost Jurassic continental and volcanic deposits of the Río Damas-Tordillo Formation represent an interval of intense continental deposition within the Jurassic to Early Cretaceous dominantly marine environment of the Mendoza-Neuquén back-arc basin. Stratigraphic and geochronological data indicate that progressive emersion of the arc and forearc domain, disconnecting the back-arc region from the Pacific Ocean, occurred during occurred during the Late Jurassic and probably the Early Cretaceous (~160-140 Ma). This change in the margin configuration induced a marine regression and the subsequent deposition of continental material in the back-arc basin. The most likely source of the sediments would have been the Jurassic arc, located west of the back-arc basin. The maximum depositional age of 146.4±4.4 Ma obtained from a red sandstone immediately below volcanic rocks confirms recent Tithonian maximum depositional ages assigned to the Río Damas-Tordillo Formation, and suggests that the volcanic rocks, overlain by marine fossiliferous Tithoninan-Hauterivian sequences, should have erupted within a short time span during the Late Jurassic. Volcanism was probably facilitated by the presence of extensional structures related to the formation of the back-arc basin. Elemental and isotopic data, along with forward AFC models, suggest a depleted sub-arc asthenospheric mantle source for the volcanic rocks and the fractionation of olivine and plagioclase, along with small volumes of lower crust assimilation, as the main processes involved in the magmatic evolution. It is not possible to establish a different source and petrogenetic conditions for the Río Damas-Tordillo Formation and the magmatism in the arc domain located further west, at the present-day Coastal Cordillera. Keywords: Jurassic, Volcanism, Central Chile, Detrital zircons, Isotopes. 530 The Upper JUrassic volcanism of The río ): insighTs on peTrogenesis... RESUMEN. El volcanismo jurásico superior de la Formación Río Damas-Tordillo (33°-35,5°S): antecedentes sobre petrogénesis, cronología, proveniencia e implicancias tectónicas. Los depósitos continentales y volcánicos delJurásico tardío, pertenecientes a la Formación Río Damas-Tordillo, representan un período de intensa sedimentación continental dentro del registro mayormente marino observado en la Cuenca Neuquina, durante el Jurásico y Cretácico Inferior. Datos estratigráficos y geocronológicos indican una progresiva emersión del dominio de arco y antearco, desconectando finalmente a la cuenca de trasarco del océano Pacífico durante el Jurásico Superior. Este cambio en la configuración del margen tuvo como resultado el desarrollo de una regresión marina y posterior sedimentación continental en la cuenca de trasarco. La fuente de sedimentos más probable habría sido el arco jurásico, ubicado hacia el oeste de la cuenca. La edad máxima de 146,4±4.4 Ma, obtenida en una arenisca roja inmediatamente por debajo de las rocas volcánicas, confirma las edades máximas de depósito titonianas, asignadas ...

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Geocronología U-Pb e isótopos de Hf-O en circones del batolito de la Costa Pensilvaniana, Chile.

Cited by 32 publications

References 32 publications

The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia

The country rocks of Devonian magmatism in the North Patagonian Massif and Chaitenia

Provenance of the Miocene Alto Tunuyán Basin (33°40′S, Argentina) and its implications for the evolution of the Andean Range: Insights from petrography and U–Pb LA–ICPMS zircon ages

El volcanismo jurásico superior de la Formación Río Damas-Tordillo (33°-35,5°S): antecedentes su sobre petrogénesis, cronología, proveniencia e implicancias tectónicas.

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