Provenance and tectonic evolution of the pre-Mesozoic Caparo Block and Merida Terrane in the Venezuelan Andes
Dugarte Newman, Jose Humberto
MetadataShow full item record
2085 U/Pb detrital zircon ages were obtained from 22 samples of pre-Mesozoic strata of the Venezuelan Andes collected in the Caparo area (Bella Vista Association, and Caparo-El Horno formations), Merida Terrane area (Iglesias Complex and Mucuchachi Association), and Permian SupraTerrane (Sabaneta-Palmarito formations). A single, pre-Mesozoic Venezuelan Andean block model is proposed based on four lines of evidence: 1) Early Paleozoic, Neoproterozoic, and Mesoproterozoic detrital zircon populations are common to the studied strata and indicate Gondwanan provenance; 2) No high pressure metamorphic rocks that suggest a collision between blocks have been reported; 3) Paleozoic magmatism is found throughout the entire orogen; 4) No Silurian deformation is found, suggesting no participation of the Venezuelan Andes in the closure of Iapetus. The Venezuelan Andes may be correlative to pre-Mesozoic strata of the Eastern Colombian Andes, and the Maya Block, but no connections seem to exist between the Venezuelan Andes, Acatlan, and Oaxaquia.