Retrowedge-related Carboniferous units and coeval magmatism in the northwestern Neuquén province, Argentina

Abstract

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Stratigraphy, structure and geodynamic evolution of the Paleozoic rocks in the Cordillera del Viento (37º S latitude, Andes of Neuquén, Argentina)

“…6) where the Andacollo Group is deposited. Zappettini et al (2012) argue that the retro-wedge basin is associated with the early stages of the frontal accretionary prism that currently outcrops in the Chilean coastline.…”

“…The chemical composition of the Guaraco Norte Formation corresponds to recycled, mature polycyclic sediment of mature continental provenance, pointing to a passive margin with minor inputs from magmatic rocks (Zappettini et al, 2012).…”

“…Recent U-Pb SHRIMP dating of detrital zircons indicate zircons of magmatic origin are mainly Devonian and Ordovician and of a maximum depositional age of 374 Ma (Late Devonian; Zappettini et al, 2012). Considering that the Devonian-Carboniferous boundary is placed at 359 million years ago, and that deformation affecting similar rocks in the Frontal Cordillera has been dated in the Late Devonian-early Carboniferous and the metamorphism in Middle-Late Devonian (Wilner et al, 2011), the age of these rocks can be established as Upper Devonian (Fig.…”

“…Alternatively, Zappettini et al (2012) point out that this unit represents passive margin deposits predating the onset of the Gondwanan accretionary prism on the Chileean coast, during the early Carboniferous and extending to the first stages of accretion in a retro-wedge position (>326 and <374 million years). This interpretation is based on assigning a lower Carboniferous age to the metamorphic rocks and including them together with the Andacollo Group.…”

Geometry of Middle to Late Triassic extensional deformation pattern in the Cordillera del Viento (Southern Central Andes): A combined field and geophysical study

“…The Guaraco Norte Formation is composed of quartz-rich metasandstones and finely laminated quartzite layers and slates, cut by numerous quartz and granitic veins. U-Pb SHRIMP dating confirms partly an Upper Devonian age, yielding a maximum depositional age of 374 Ma and 389 Ma (Zappettini et al, 2012). The Guaraco Norte Formation was deformed and metamorphosed in Late Devonian -early Carboniferous times by the Chanic orogeny (Giacosa et al, 2014).…”