A geochronological review of magmatism along the external margin of Columbia and in the Grenville-age orogens forming the core of Rodinia

1.79–1.75 Ga mafic magmatism of the Siberian craton and late Paleoproterozoic paleogeography

The geometry and evolution of pre-existing basement in accretionary belts bordering supercontinents are often unclear. Integrative interpretation of long-wavelength potential field satellite data can image deep crust structure, improving our understanding of lithospheric processes that formed these margins bottom-up. Here, we present a multidisciplinary interpretation of the lithospheric architecture of the central southern Amazon Craton, a fragment of an accretionary belt at the southwestern Columbia supercontinent margin. Satellite-borne gravity and magnetic data, airborne magnetic data, passive seismic (Vp/Vs ratio, crustal thickness) and seismic tomography data reveals that basement terranes from the interior of the craton extend into the accretionary margin of Columbia. We demonstrate a vertically heterogeneous structure with an underlying strongly reworked pre-Columbia tectonic wedge that sustained prolonged modification during the supercontinent assembly as corroborated by Nd isotope and geochronology data. Nd isotope data suggest that the protracted orogenic wedge was influenced by subduction angle shifts over time, including addition of substantial juvenile material during slab retreat events. This interplay promoted Craton growth at the supercontinent margin while keeping a subtle record of the pre-existing framework. Our findings point to the possible misrepresentation of basement extension and geometry of supercontinent margins elsewhere. 

Unwrapping reworked crust at the Columbia supercontinent margin within central southern Amazon Craton using multi-source geophysics and geochronology data synergy

Paleomagnetic study of the 1112 Ma Huanchaca mafic sills (SW Amazonian Craton, Brazil) and the paleogeographic implications for Rodinia supercontinent

Age, geochemistry and mantle source of the Alto Diamantino basalts: Insights on NW Paraná Magmatic Province

This paper overviews the Proterozoic Large Igneous Provinces of the Amazonian Craton, characterized by large volumes of extrusive and intrusive magmatic rocks. We reassess the geologic, geochronologic and geochemical information to stablish three intracontinental felsic volcanic-plutonic igneous belts (i.e., SLIPs), namely: Orocaima (1.98-1.96 Ga), Uatumã (1.88-1.87 Ga) and Alta Floresta (1.80-1.79 Ga). The Avanavero LIP (1.79-1.78 Ga), as well as the Rincón del Tigre-Huanchaca LIP (1.11 Ga) are also revisited. The relationships of these events with intraplate settings through time and space are apparent. We examine the main characteristics of each magmatic event in light of the U-Pb zircon and baddeleyite ages and coupled isotopic-geochemical constraints, the geodynamic significance, and metallogenetic potential. The Uatumã and Alta Floresta SLIPs host the most important mineral resources within the Amazonian Craton. Global barcode matches of the Proterozoic SLIPS/LIP events of Amazonia are also addressed, as well as their possible links with geologic time-scale periods: the Orosirian, Statherian and Stenian boundaries. We also evaluate the available paleomagnetic data to address issues related to the barcode match of such SLIP/LIP events in the context of supercontinent cycles.

Large igneous provinces of the Amazonian Craton and their metallogenic potential in Proterozoic times

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Large igneous provinces of the Amazonian Craton and their metallogenic potential in Proterozoic times