Please use this identifier to cite or link to this item:
https://repositorio.ufba.br/handle/ri/2515
metadata.dc.type: | Artigo de Periódico |
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 |
metadata.dc.creator: | 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 |
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. |
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 |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/2515 |
Issue Date: | 2005 |
Appears in Collections: | Artigo Publicado em Periódico (IGEO) |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.