Northward propagation of Andean genesis: Insights from Early Cretaceous synorogenic deposits in the Aysén-Río Mayo basin

Abstract

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How Much Did the Colombian Andes Rise by the Collision of the Caribbean Oceanic Plateau?

“…Limited Early Cretaceous topography recorded in the northern Andes also likely persisted in the central and southern Andes, as suggested by the dominance of shallow‐marine depositional settings and the provenance from easterly intra‐plate sources (i.e., limited sediment dispersal from the growing hinterland), together with the presence of a thin (∼20 km‐thick) crust (e.g., Gianni et al., 2020; Horton, 2018a; Hurtado et al., 2018). Such scenario was probably associated to margin‐scale extensional tectonics and the formation of back‐arc and intra‐arc basins, which shifted to a compressional‐neutral regime between ∼120 and 90 Ma in response to the northward propagation of the opening of the Atlantic Ocean and subsequent westward drift of South America (Gianni et al., 2020 and references therein). However, as suggested from the stratigraphic record and our paleoelevation estimates, this continental‐scale tectonic reorganization seems not to have largely contributed to the topographic growth of the Andes.…”

“…The along‐strike Meso‐Cenozoic segmentation of the Andes, represented by an accretionary and a subduction‐dominated orogen in the northern and central‐southern segments, respectively, may involve distinct tectonic drivers of mountain uplift that could operate simultaneously at different temporal and spatial scales (e.g., Ramos, 2009). Despite large‐scale plate kinematic and/or mantle‐related processes likely contributed to the earliest topographic growth in the central and southern Andes (Faccenna et al., 2017; Gianni et al., 2020; Horton, 2018b; and references therein), abundant tectono‐stratigraphic and magmatic evidence supports the major role of the Late Cretaceous – Paleogene collision of the oceanic plateau on the earliest growth of the northern Andes (Montes et al., 2019 and references therein).…”

“…contributed to the earliest topographic growth in the central and southern Andes (Faccenna et al, 2017;Gianni et al, 2020;Horton, 2018b; and references therein), abundant tectono-stratigraphic and magmatic evidence supports the major role of the Late Cretaceous -Paleogene collision of the oceanic plateau on the earliest growth of the northern Andes (Montes et al, 2019 and references therein).…”

Iron oxide copper-gold (IOCG) deposits – A review (part 1): Settings, mineralogy, ore geochemistry and classification

“…A major transition occurred during the Late Cretaceous when Jurassic magmatic arc and sedimentary back-arc basin rocks that formed within an extensional tectonic setting were subjected to inversion. This transition to a compressive setting has been the subject of many studies and is now thought to have been diachronous from south to north and may have commenced as early as 130-122 Ma at latitudes of 40ᵒ-46ᵒ S (Gianni et al, 2020). However at the latitudes of the CIB and partly co-located Cu-Au-Fe deposits (e.g.…”

Evolución Cenozoica de la Cuenca de Antepaís de Tres Cruces, Cordillera Oriental, noroeste de Argentina

“…Facultad de Ciencias Naturales y Museo -UNLP producto de engrosamiento cortical y magmatismo, en respuesta a la subducción de la placa oceánica de Nazca por debajo de la placa continental de América del Sur, comenzando su levantamiento desde los 130-124 Ma en la Patagonia y creciendo progresivamente hacia el norte, alcanzando su longitud actual a los 90-70 Ma. (Gianni et al, 2020).…”