Zircon and Titanite U–Pb SHRIMP dating of unexposed basement units of the Buenos Aires region, southeastern Río de La Plata Craton, Argentina
MetadataShow full item record
We present U–Pb Sensitive High Mass Resolution Ion MicroProbe (SHRIMP) data of unexposed igneous-metamorphic basement rocks from two areas of the southeastern Río de la Plata craton (RPC; Buenos Aires city) located within the Buenos Aires–Piedra Alta (BAPA) terrane – and the Tapalqué area (Buenos Aires province) – located within the Tandilia terrane, and discuss the tectonic evolution of that portion of the craton based on both the new data and previous work. The newly obtained geochronological data of drill cores indicate that: (a) arc magmatism occurred at 2164–2186 Ma corresponding to early ‘Trans-Amazon’ (early Rhyacian) arc magmatism; (b) the age of collision between the BAPA and Tandilia terranes is inferred to have commenced at ca. 2110 Ma; (c) peak metamorphism occurred at ca. 2069 Ma; and (d) the presence of rocks related to the RPC is confirmed under Cenozoic sediments in a large area between Martin Garcia Island and Tandil. We envisage an early Rhyacian divergent double subduction scheme between the BAPA and Tandilia terranes – i.e. N-dipping towards BAPA and S-dipping towards Tandilia – prior to the late Rhyacian collision between these two terranes.
Showing items related by title, author, creator and subject.
Spatial statistical estimation of undiscovered mineral endowment: case of komatiite-associated nickel sulphide resources, Kalgoorlie Terrane, Western AustraliaMamuse, Antony (2010)The Kalgoorlie Terrane of the Yilgarn Craton, Western Australia, containing about 60% (~11 Mt) of the world’s known komatiite-hosted nickel sulphide resources, is the world’s best studied and economically most important ...
Kirkland, C.; Johnson, S.; Smithies, R.; Hollis, J.; Wingate, M.; Tyler, I.; Hickman, A.; Cliff, J.; Tessalina, Svetlana; Belousova, E.; Murphy, R. (2013)Time-constrained isotopic datasets permit the evaluation of tectonic processes, including continental collision, rifting, and the origins of terrane fragments. The Rudall Province, in the Paterson Orogen, is part of the ...
Spatio-temporal constraints on lithospheric development in the southwest-central Yilgarn Craton, Western AustraliaMole, D.; Fiorentini, M.; Thebaud, N.; McCuaig, T.; Cassidy, K.; Kirkland, Chris; Wingate, M.; Romano, S.; Doublier, M.; Belousova, E. (2012)The Archean western Yilgarn Craton contains an extensive record of supracrustal formation from ca 3730 to ca 2675 Ma, as well as evidence of an ensialic crustal component as old as ca 4400 Ma. These features make the ...