Paleo-Mesoproterozoic arc-accretion along the southwestern margin of the Amazonian craton: The Juruena accretionary orogen and possible implications for Columbia supercontinent
作者： J.E. Scandolara , R.T. Correa , R.A. Fuck , V.S. Souza , J.B. Rodrigues
DOI: 10.1016/J.JSAMES.2016.12.005
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摘要: Abstract The southwestern portion of the Amazonian craton, between Ventuari-Tapajos province and Andean chain, has been ascribed to a succession orogenic events from 1.81 0.95 Ga, culminating with widespread anorogenic magmatism. Southwestward Serra do Cachimbo graben occurs Juruena accretionary belt (ca. 1.81–1.51 Ga), previously included in Rio Negro-Juruena Rondonian/San Ignacio geocronological provinces or Rondonia-Juruena geologic province. orogen proposed here includes Jamari tectonostratigraphic terranes, products convergence which culminated soft collision Paragua protocraton Tapajos-Parima arc system (Tapajos Province) ca. 1.69–1.63 Ga ago. Geophysical, geochemical, petrological geochronological data systematic geological mapping suggest that convergent event resulted single two continental margin arcs, namely arcs. Modern tectonic approaches, combined aerogeophysics data, enable interpreting this wide region craton as Paleoproterozoic well defined petrotectonic units tectonoestructural framework. is an E-W trending belt, about 1100 km long 350 km wide, inflecting NW-SE, Mato Grosso, Amazonas Rondonia, Brazil. general direction its inflections internal geometric kinematic aspects macrostructures not corroborate NW-SE trend originally provinces. site repeated reactivation renewed basin formation, magmatism orogeny during Mesoproterozoic early Neoproterozoic. U-Pb whole-rock Sm-Nd ages, Ar-Ar Rb-Sr mineral ages older high grade tectonometamorphic took place 1.69 1.63 defining metamorphic peak original structural architecture orogen. main structures were almost completely obliterated 1.42 1.37 due superimposed Rondonian-San orogeny. Later on, 1.20 1.12 these affected by ductile represented large Ji-Parana transpressive shear Tarilândia transcurrent zone developed under low-T amphibolite facies conditions, both related Sunsas evolution terranes Paleoproterozoic/Mesoproterozoic 1.51 their thorough reworking times instrumental establishing position Paleo-Mesoproterozoic Columbia (Nuna) supercontinent, Rodinia reconstruction at end Mesoproterozoic.
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