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Title: | Geología y geocronología U-Pb del granito de Banabuiú, Noreste de Ceará, Brasil |
Other Titles: | Geology and U-Pb geochronology of the Banabuiú granite, Northeastern Ceará, Brazil |
Author: | Lima, M. N. Nogueira Neto, J. A. Azevedo, M. R. Valle Aguado, B. |
Keywords: | Orogenia Brasiliense Granitos de dos micas Geocronología U-Pb Brasiliano Orogeny Two-mica granites U-Pb geochronology Granite Migmatite Partial melting Borborema Brazil Ceará Central Domain |
Issue Date: | 2010 |
Publisher: | CSIC-UCM |
Abstract: | El macizo de Banabuiú aflora en el Dominio Ceará Central (DCC) de la Provincia de Borborema (NE
Brasil) como una intrusión granítica alargada según la dirección N-S, concordante con las estructuras
regionales. Está emplazado en rocas del Paleoproterozoico intensamente deformadas y transformadas
en gneises y migmatitas durante la Orogenia Brasiliense (~600 Ma). Con base en dataciones U-Pb de
circones, la edad de cristalización del granito de dos micas de Banabuiú es estimada en 578,6 ± 6,5 Ma.
El granito es fuertemente peraluminoso y presenta una signatura geoquímica de tipo-S. Los valores de ε
Nd
580
son marcadamente negativos (ε
Nd
580
= –19 a –23) y se sobreponen parcialmente con los del
Complejo Gnéisico Migmatítico del DCC (ε
Nd
580
= –12 a –26), sugiriendo que el magma parental del granito ha sido generado a través de la fusión parcial de materiales corticales semejantes a los que se
encuentran en el DCC. The Banabuiú massif crops out in the Central Ceará Domain (DCC) of the Borborema Province (NE Brasil), as an N-S elongate granite intrusion, concordant with the regional structures. It was emplaced into basement rocks of Paleoproterozoic age, extensively transformed into gneisses and migmatites during the Brasilian orogeny (∼600 Ma). Using U-Pb zircon dating, the crystallization age of the Banabuiúsyn-kinematic two-mica granite was estimated at 578.6 ± 6.5 Ma. The granite is strongly peraluminous (A/CNK = 1,098 - 1,134) and shows a typical S-type geochemical signature. The ΣNd580 values are strongly negative (ΣNd580 = -19 a -23) and partially overlap with those of the Paleoproterozoic gneissmigmatite complex (ΣNd580 = -12 to -26), suggesting that the parental magmas of the Banabuiú granite could have been produced by partial melting of similar crustal materials. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/13023 |
DOI: | 10.3989/egeol.40196.113 |
ISSN: | 0367-0449 |
Appears in Collections: | DGeo - Artigos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Estudios_Geol_Lima et al_10.pdf | Documento principal | 334.08 kB | Adobe PDF | View/Open |
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