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Abstract:

This study describes the stratigraphic features, petrology and geochemistry and geochronology constraints of K-bentonites, ignimbrites and related volcanogenic rocks interbedded in the marine sedimentary sequence of the El Jagüelito Formation from northern Patagonia basement, southwestern Gondwana margin (41°33′S-65°15′W, South America). Six SHRIMP and ICP-MS U-Pb zircon ages from pyroclastic and volcanogenic sedimentary rocks indicate two stages of synsedimentary volcanism at c. 530 and c. 515 Ma which constraint the whole volcano-sedimentary pile to Early-Middle Cambrian. Distal volcanic ash fall deposits of K-bentonites and proximal pyroclastic flows of ignimbrites were erupted from three subaerial to subaqueous eruptive centers and are associated with volcanogenic facies and sub-volcanic intrusive equivalents. The volcanic rocks were deposited synchronously with on-going dynamic siliciclastic sedimentation into an actively subsiding basin. Dacitic K-bentonites and high-silica rhyolitic ignimbrites belong to the same high-K calc-alkaline/shoshonitic magma series and have a similar peraluminous signature. Their HFSE patterns with relative depletion in Nb, Sr, P, and Ti and the LREE-enriched patterns with a negative Eu anomaly indicate characteristics of subduction-related magmas associated with active continental arc magmatism. The geochemical discrimination diagrams together with geological features suggest an extensional tectonic setting for K-rich magmas within the overall convergent-margin system. Silicic, more potassic magmas with the inherited subduction-related character of the El Jagüelito Formation erupted on a back-arc basin. Their volcanic rocks are products of a mixture of fractionated mafic magmas and partial crustal melts. The integration of the Cambrian synsedimentary explosive volcanism of the El Jagüelito Formation with coeval magmatism of northern Patagonia led the interpretation to the continental scale of the paleo-Pacific margin of Gondwana by Early Paleozoic. The El Jagüelito Formation has provided consistent lithological, stratigraphic, geochemical and geochronological arguments to assess continental comparisons and a paleogeographic reconstruction between the eastern North Patagonian Massif and East Antarctica that fit in well the hypothesis that the northern Patagonia basement once occupied a position adjacent to East Antarctica. A series of geodynamic stages is proposed that allow for providing a Cambrian framework for understanding the magmatic arc-back arc system modified by episodic pulses of extension associated with slab-roll back which terminated in detachment of northern Patagonia from the East Antarctica continental margin by Late Cambrian. The several lines of geological evidence discussed in this paper point to a parautochthonous origin of the eastern North Patagonian Massif as an outboard assemblage that represents the conjugate margin of the Pensacola-Queen Maud-Ellsworth-Whitmore Mountains of Antarctica. © 2018 International Association for Gondwana Research

Registro:

Documento: Artículo
Título:Patagonia-Antarctica Early Paleozoic conjugate margins: Cambrian synsedimentary silicic magmatism, U-Pb dating of K-bentonites, and related volcanogenic rocks
Autor:González, P.D.; Sato, A.M.; Naipauer, M.; Varela, R.; Basei, M.; Sato, K.; Llambías, E.J.; Chemale, F.; Dorado, A.C.
Filiación:Instituto de Investigación en Paleobiología y Geología, UNRN-CONICET, Av. Julio A. Roca 1242, R 8332 EXZ, General Roca, Río Negro, Argentina
Centro de Investigaciones Geológicas, UNLP-CONICET, Diagonal 113 N° 275, B 1904 DPK, La Plata, Buenos Aires, Argentina
Instituto de Estudios Andinos “Don Pablo Groeber”, UBA-CONICET, Güiraldes 2160, Ciudad Universitaria, Pabellón II, C 1428 EHA, Buenos Aires, Argentina
Centro de Pesquisas Geocronológicas, Instituto de Geociências, USP, Rua do Lago 562, São Paulo, SP 05508-080, Brazil
GEO-Departamento de Geologia Geral e Aplicada, Instituto de Geociências, Universidade de Brasília, ICC-Centro, Campus Universitário Darcy Ribeiro Asa Norte70910-900, Brazil
Departamento de Geología, Universidad de Huelva, Campus del Carmen, Huelva, 21071, Spain
Palabras clave:Antarctica; Cambrian magmatism; Gondwana; K-bentonite; Patagonia; U-Pb dating
Año:2018
Volumen:63
Página de inicio:186
Página de fin:225
DOI: http://dx.doi.org/10.1016/j.gr.2018.05.015
Título revista:Gondwana Research
Título revista abreviado:Gondwana Res.
ISSN:1342937X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v63_n_p186_Gonzalez

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Citas:

---------- APA ----------
González, P.D., Sato, A.M., Naipauer, M., Varela, R., Basei, M., Sato, K., Llambías, E.J.,..., Dorado, A.C. (2018) . Patagonia-Antarctica Early Paleozoic conjugate margins: Cambrian synsedimentary silicic magmatism, U-Pb dating of K-bentonites, and related volcanogenic rocks. Gondwana Research, 63, 186-225.
http://dx.doi.org/10.1016/j.gr.2018.05.015
---------- CHICAGO ----------
González, P.D., Sato, A.M., Naipauer, M., Varela, R., Basei, M., Sato, K., et al. "Patagonia-Antarctica Early Paleozoic conjugate margins: Cambrian synsedimentary silicic magmatism, U-Pb dating of K-bentonites, and related volcanogenic rocks" . Gondwana Research 63 (2018) : 186-225.
http://dx.doi.org/10.1016/j.gr.2018.05.015
---------- MLA ----------
González, P.D., Sato, A.M., Naipauer, M., Varela, R., Basei, M., Sato, K., et al. "Patagonia-Antarctica Early Paleozoic conjugate margins: Cambrian synsedimentary silicic magmatism, U-Pb dating of K-bentonites, and related volcanogenic rocks" . Gondwana Research, vol. 63, 2018, pp. 186-225.
http://dx.doi.org/10.1016/j.gr.2018.05.015
---------- VANCOUVER ----------
González, P.D., Sato, A.M., Naipauer, M., Varela, R., Basei, M., Sato, K., et al. Patagonia-Antarctica Early Paleozoic conjugate margins: Cambrian synsedimentary silicic magmatism, U-Pb dating of K-bentonites, and related volcanogenic rocks. Gondwana Res. 2018;63:186-225.
http://dx.doi.org/10.1016/j.gr.2018.05.015