Rodinia descendants in south america

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Precambrian Research 160 (2008) 108–126

Rodinia descendants in South America
Reinhardt A. Fuck a,∗ , Benjamim Bley Brito Neves b , Carlos Schobbenhaus c b Instituto de Geociˆ ncias, Universidade de Bras´lia, 70910-900 Bras´lia, Brazil e ı ı Instituto de Geociˆ ncias, Universidade de S˜ o Paulo, 05508-080 S˜ o Paulo, Brazil e a a c Servi¸ o Geol´ gico do Brasil-CPRM, 70830-030 Bras´lia, Brazil c o ı

a

Received 5 December 2006; received in revised form 10 January 2007; accepted 23 April 2007

Abstract Geological structures and Precambrian rock units thought to be related to Rodinia Supercontinent evolution were recognized in three main domains of South America: (i) Mesoproterozoic fold belts ca. 1.5–1.1 Ga old and corresponding foreland cover successions and coeval cratonic intrusions exposed in the southwestern portion of the Amazonian Craton make up the most complete and best preserved record of interpreted Rodinia amalgamation in South America. Recently obtained paleomagnetic data place this part of the Amazonian Craton close to the southernmost segment of Laurentia’s Grenville margin. Inferred collision of both continents is reflected in the Nova Brasilˆ ndia and Aguape´-Sunsas fold belts, a ı as well as in the Llano Uplift area. (ii) In eastern South America small crustal fragments of inferred Rodinia ascent were variably reworked during Neoproterozoic Brasiliano orogenic events, rendering it difficult to recognize and map Meso-Neoproterozoic (Grenvillian) mobile belts. So far, the best candidates to represent possible fragments of such mobile belts were recognized in the Punta del Este, Uruguay, terrain, in the Serra do Itaberaba, S˜ o Paulo, eastern Brazil area and in the Cariris Velhos, northeastern Brazil area. (iii) The third domain comprises a number of scattered a basement exposures within the Andean Cordillera, from Venezuela and Colombia (Guajira, Santa Marta) in the north to northwest Argentina