A Provenance Analysis from the Lower Jurassic Units of the Neuquén Basin. Volcanic Arc or Intraplate Magmatic Input?
| Autor: | Victor A. Ramos, Marcelo Jorge Manassero, Ezequiel Garcia Morabito, Maximiliano Naipauer, Victor A. Valencia |
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| Přispěvatelé: | Folguera, Andrés, Contreras Reyes, Eduardo, Heredia, Nemesio, Encinas, Alfonso, Iannelli, Sofía, Oliveros, Veronica, Dávila, Federico, Collo, Gilda, Giambiagi, Laura Beatriz, Maksymowicz, Andrei, Iglesias Llanos, Paula, Turienzo, Martín, Naipauer, Maximiliano, Orts, Darío Leandro, Litvak, Vanesa Dafne, Alvarez Pontoriero, Orlando, Arriagada Ortega, César Arturo |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
geography
Provenance geography.geographical_feature_category Volcanic arc Permian Geochemistry 010502 geochemistry & geophysics 01 natural sciences Ciencias de la Tierra y relacionadas con el Medio Ambiente Volcanic rock Petrography Igneous rock U-Pb DETRITAL AGES CYO GROUP Geochronology Geología 010503 geology PROVENANCE Geology CIENCIAS NATURALES Y EXACTAS 0105 earth and related environmental sciences Zircon Hf ISOTOPES |
| Zdroj: | The evolution of the Chilean-Argentiean Andes The Evolution of the Chilean-Argentinean Andes ISBN: 9783319677736 |
| DOI: | 10.1007/978-3-319-67774-3_8 |
| Popis: | A possible signal of the Jurassic Chon Aike Igneous Province within the early infill of the Neuquén Basin is recognized in our provenance analyses. We use a combination of detrital zircon geochronology and Lu-Hf isotope analysis, along with sandstone petrography descriptions to characterize the sediments source region in the Cuyo Group. The sandstone petrographic analysis confirms important contributions from volcanic sources of different compositions. U-Pb ages and Hf isotopes obtained in the analyzed zircons indicate a more complex configuration given by multiple igneous components. The variations in the provenance patterns allow us to make some observations about the paleogeographic evolution of the basin. At the base of the sequence, the sediments were derived from local sources composed of Permian basement and Upper Triassic volcanic rocks, whereas in the top, the zircons were supplied from Lower Jurassic volcanic rocks and Lower Paleozoic and Precambrian basements suggesting more distal and ancient sources. Low values of εHft (-15.5 to -0.7) analyzed in Permian and Triassic detrital zircons indicated an evolved source with strong crustal contribution. This data is in agreement with the negative values of εHft and εHft calculated in Permian and Triassic igneous rocks from the North Patagonian Massif. The Hft about -4 of the Jurassic detrital zircons indicated a crustal origin for the source rocks and are clearly compatible with the isotopic compositions of the Chon Aike Igneous Province. A volcanic source region compatible with the Andean arc is dismissed because the Jurassic arc has isotope characteristics of a mantle source. Fil: Naipauer, Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Garcia Morabito, Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Manassero, Marcelo Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina Fil: Valencia, Victor. University of Washington; Estados Unidos Fil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina |
| Databáze: | OpenAIRE |
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