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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/2515

Title: Assinatura Mantélica De Isótopos De Carbono e Oxigênio Em Cristais De Calcita De Rochas Foid-Sieníticas Da Província Alcalina Do Sul Do Estado Da Bahia
Other Titles: Revista Brasileira de Geociências
Authors: Rosa, Maria de Lourdes da Silva
Conceição, Herbet
Moura, Candido Augusto Veloso
Macambira, Moacir José Buenano
Marinho, Moacyr Moura
Leal, Rita Cunha Menezes
Cunha, Mônica Prisgsheim da
Rios, Débora Correia
Keywords: Magmatic calcite. C and O isotopes. South Bahia Alkaline Province;Calcita magmática. Isótopos de C e O. Província Alcalina do Sul do Estado da Bahia
Issue Date: 2005
Abstract: MANTELIC SIGNATURE OF CARBON AND OXIGEN ISOTOPES OF CALCITE CRISTALS FROM FOID-SIENITIC ROCKS OF THE ALKALINE PROVINCE OF SOUTHERN BAHIA, BRAZIL The South Bahia Alkaline Province (SBAP), with Neoproterozoic age (739 - 676 Ma), is a magmatic association formed by four batholiths and several stocks, predominantly composed by foid-syenitic rocks. In these rocks calcite crystals can occur disseminated, form aggregates, fill micro-fractures and as centimetric dykes. C and O isotopic data of calcite range between δ13CPDB -4,84 º/oo and - 7,35 º/oo, δ18OSMOW 6,47º/oo and 7,17 º/oo , which are similar values to those observed in carbonates crystallized from primary igneous carbonatitic magmas, with δ13CPDB data close to those reported for the mantle. These data permit to infer that the evolution of these alkaline intrusions took place in a closed system, preserving the C and O mantle signature even in late-magmatic minerals, such as calcite.
Description: p. 71-76
URI: http://www.repositorio.ufba.br/ri/handle/ri/2515
ISSN: 2177-4382
Appears in Collections:Artigos Publicados em Periódicos (IGEO)

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