Abstract Views :167 |
PDF Views:2
Authors
Affiliations
1 Departmento de Processos Especiais, Instituto de Pesquisas Energeticas e Nucleares-IPEN/CNEN/SP Cidade Universitaria-Caixa Postal 11049-Pinheiros Sao Paulo, BR
2 Departamento de Metalogenese e Geoquimica Aplicada. Instituto de Geociencias, Universidade de Campinas Caixa Postal 6152-Campinas, BR
3 Instituto de Geociencias-Geochronology Research Center, Universidade de Sao Paulo, Sao Paulo, BR
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 29, No 3 (1987), Pagination: 309-326
Abstract
An attempt to assemble the available data on the granulite facies rocks spread around Brazil is made with a view to discuss their geological setting, geochronological evolution, petrographic and geochemical evolution. The isotopic ages of the granulites fall into different groups ranging from Archaean to Late Proterozoic. The geotectonic evolution of these rock types is discussed in terms of their being either fragments of geochemically differentiated lower crustal layers or eroded segments of modern Cordilleran (Himalayan) type collision belts. The geochemical feature of the rock types demonstrates the non-systematic fractionation of trace elements.
