Chemostratigraphy of Mesoproterozoic and Neoproterozoic carbonates of the Nico Pérez Terrane,Río de la Plata Craton,Uruguay |
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| Authors: | Leticia Chiglino Claudio Gaucher Alcides N Sial Jorge Bossi Valderez P Ferreira Márcio M Pimentel |
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| Institution: | 1. NEG-LABISE, Departamento de Geologia, Universidade Federal de Pernambuco (UFPE), C.P. 7852, Recife, PE 50670-000, Brazil;2. Departamento de Geología, Facultad de Ciencias, Iguá 4225, 11400 Montevideo, Uruguay;3. Institute of Geography and Geology and Nordic Center for Earth Evolution (NordCEE), University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen, Denmark;4. Cátedra de Geología, Facultad de Agronomía, Garzón 780, Montevideo, Uruguay;5. Instituto de Geociencias, Universidade de Brasilia, Brasília, DF 70910-900, Brazil |
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| Abstract: | Increasing evidence shows that Mesoproterozoic rocks are widespread in the Río de la Plata Craton. Carbon and strontium isotope analyses were carried out for three different, carbonate-bearing successions in the southern Nico Pérez Terrane. The Parque UTE Group is erected, comprising (from base to top) the mainly volcanogenic Cañada Espinillo Formation, the dolomitic Mina Valencia Formation and the mixed carbonate-siliciclastic Cerro del Mástil Formation. A δ13C curve was obtained for carbonates of the Parque UTE Group, which is characterized by a plateau at +1 to +1.6‰ V-PDB, bracketed between two negative excursions (−1.8‰ V-PDB at the base and −3.3‰ V-PDB at the top). These values are consistent with a Mesoproterozoic depositional age for the unit, as indicated by U–Pb ages of synsedimentary volcanics and gabbros of 1429 ± 21 and 1492 ± 4 Ma, respectively. |
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| Keywords: | Mesoproterozoic Carbon isotopes Strontium isotopes Rodinia Uruguay |
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