Early to Late Paleoproterozoic magmatism in NE Brazil: The Alto Moxotó Terrane and its tectonic implications for the Pre-West Gondwana assembly

Geochemistry and U–Pb zircon ages of plutonic rocks from the Algodões granite-greenstone terrane, Troia Massif, northern Borborema Province, Brazil: Implications for Paleoproterozoic subduction-accretion processes

“…Therefore, it is quite plausible that at~2100e2036 Ma, final amalgamation and continental collision took place (Fig. 14D), timing up this orogeny between 2.2 and 2.0 Ga, similar to many other Rhyacian plutonic records in the Borborema Province (e.g., Souza et al, 2007;Hollanda et al, 2011;Santos et al, 2015;Neves et al, 2015).…”

“…Crustal growth and reworking by successive subduction/accretionary/collisional processes may have continued, because younger~2100e2040 Ma tonalitic/granodioritic orthogneisses have been described northwest of the Troia Massif (Canind e and Forquilha region, Amaral et al, 2012). Similarly, late~2 100e2040 Ma arc-accretionary and collisional plutonism is also common at the Transversal (Central) zone of Borborema Province (e.g., Santos et al, 2015;Neves et al, 2015).…”

“…1C). Most of the basement rocks surrounding these Archean "fragments" are Paleoproterozoic in age, with abundant magmatic record at 2.2e2.0 Ga (e.g., Hackspacher et al, 1990;Fetter et al, 2000;Souza et al, 2007;Hollanda et al, 2011;Van Schmus et al, 2008;Martins et al, 2009;Van Schmus et al, 2011;Neves et al, 2015;Santos et al, 2015). According to many of these authors, the framework of juvenile and reworked Paleoproterozoic domains encompassing Archean "microcontinents" probably represents the final record of a~2.2e2.0 Ga accretionary orogeny.…”

Accretion Tectonics in Western Gondwana Deduced From Sm‐Nd Isotope Mapping of Terranes in the Borborema Province, NE Brazil

“…The Alto Moxotó Terrane is a high‐grade metamorphic crustal block composed of orthogneisses, migmatites, metagranites, and mafic‐ultramafic rocks coupled with supracrustal sequences that experienced Neoarchean to Paleoproterozoic accretion and collision events between 2.6 and 1.9 Ga (Brito Neves et al, ; Neves et al, ; Santos et al, ; L.C.M.L. Santos et al, ; Santos, Dantas, Cawood, et al, ). Its boundary with the Southern Sub‐province is the Pernambuco Lineament in the west and the Congo Cruzeiro do Nordeste strike‐slip shear zone including the Rio Capibaribe Terrane in the east (Brito Neves et al, ; Santos et al, ).…”

Constraints from zircon geochronology on the tectonic evolution of the Borborema Province (NE Brazil): Widespread intracontinental Neoproterozoic reworking of a Paleoproterozoic accretionary orogen

“…Orthogneisses with similar ages have recently been identified much further east, near the Serid o Belt (Hollanda et al, 2011), and metavolcanic rocks intercalated with metasedimentary rocks in the M edio-Coreaú Domain provided an age of 1.78 Ga (Santos et al, 2008a). Ages slightly younger (1.72e1.52 Ga), but with some overlap with these, are found in meta-anorthosites and orthogneisses in the eastern sector of the Central Subprovince (Accioly et al, 2000;S a et al, 2002;Lages et al, 2013;Santos et al, 2015). Finally, Van Schmus et al (1995) report an age of 1.58 Ga for an orthogneiss in the Pernambuco-Alagoas Domain.…”