Neoproterozoic magmatic arc volcanism in the Borborema Province, NE Brazil: possible flare-ups and lulls and implications for western Gondwana assembly

New Insights into Pre-to-Post Ediacaran Zircon Fingerprinting of the Mamfe PanAfrican Basement, SW Cameroon: A Possible Link with Rocks in SE Nigeria and the Borborema Province of NE Brazil

“…900-540 Ma), were also found [65,[70][71][72][73]. Early Tonian to Ediacaran aged basement rocks include (1) 900-800 Ma crustal extension mafic to ultramafic intrusions (~900 Ma [74]), continental-rift basic volcanic rocks (~882 Ma [75]), and A-type orthogneisses (~869 Ma [76]); (2) 820-650 Ma continental drift following the Tonian rifting that culminated with oceanic crust development [75] and separation of the Borborema lithospheric blocks from the São Francisco-Congo paleocontinent, and the development of rift/passive margin units [73]; (3) 650-620 Ma subducted and continental arc phases enclosing syn-orogenic, greywacke-rich units with intermediate to felsic volcanic and volcaniclastic intercalations [75]; and (4) 620-590 Ma collisional phase of the Brasiliano orogeny associated with crustal anatexis generated syn-collisional plutons [75,77,78]. Extensive shear zone networks were developed towards the end of the Brasilia orogeny, which are spatially related to post-collisional granite intrusions of 590 to 510 Ma (e.g., [79][80][81][82]).…”

The Zona Transversal Domain of the Borborema Province, northeastern Brazil: Synthesis of the Archean to Cambrian evolution, and new tectonostratigraphic interpretation

“…Mesoproterozoic is not represented in this part of the TZD, the next record being already in the Tonian. A deep-water environment with deposition on continental crust between 950 and 995 Ma is suggested for the paraderived lithotypes of the Barro and Salgueiro complexes, with subsequent inversion of these basins and possible arc environment formation in the Cryogenian, represented by the Santana dos Garrotes (603 to 685 Ma age of crystallization in metarhyolites) and Serra do Olho d'Agua formations (Figure 14B) (Brito and Fernandes 2021;Brito and Marinho 2017;Brito Neves and Passarelli 2020;Medeiros 2004;Caxito et al 2021).…”

The role of V-shaped oceans and ribbon continents in the Brasiliano/PanAfrican assembly of western Gondwana

“…However, according to our view, during the Tonian and Cryogenian extensional events, rifting of substantial portions of the Central African Block led to the development of V-shaped gulfs partially floored by oceanic crust, as well as micro- and ribbon continents that would drift relatively freely as distinct plates, and eventually reunite to form the Mantiqueira/SW Africa and Borborema/NW Africa systems. Birth and consumption of these ancient oceans are recorded by scraps of Neoproterozoic oceanic lithosphere enclosed in accretionary mélanges 78 – 80 , island- and continental-margin arc systems 81 – 83 and other plate tectonics markers preserved between the major reworked ribbon continents.…”

“…Lord Howe Rise) from hyperextension off the eastern Australian coast (( A ), ( B ), ( C ); redrawn from 99 after 103 ; ( D ), present-day Zealandia on a Google Earth Landsat/Copernicus image) and the formation of the Mantiqueira/SW Africa and Borborema/NW Africa ribbon continents after hyperextension of a former Central African Block ( E ). Ribbon continents in Borborema named after 5 , 83 , as follows: NOBO-BENI Northern Borborema/Benino-Nigerian, AMCAPAY Alto Moxotó-Rio Capibaribe-Adamawa-Yadé. Maps and drawings created using Corel Draw Graphics Suite 2018 ( http://www.coreldraw.com ) and a Huion Kamvas GS1331B pen display ( http://www.huion.com ).…”