Isotopic geochronology of granitic rocks from the Central Iberian Zone: comparison of methodologies

Five granitic rocks, concentrically disposed from core to rim, were distinguished in the Castelo Branco pluton. U-Pb-Th electron microprobe monazite ages from granitic rocks are similar and ranging between 297-303 Ma. The granitic rocks from Castelo Branco pluton are 310 ± 1 Ma old, obtained by U-Pb...

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Bibliographic Details
Main Author: Antunes, I.M.H.R. (author)
Other Authors: Neiva, A.M.R. (author), Silva, M.M.V.G. (author)
Format: article
Language:eng
Published: 2011
Subjects:
Geochronology
Zircon
Monazite
Castelo Branco pluton
Online Access:http://hdl.handle.net/10400.11/867
Country:Portugal
Oai:oai:repositorio.ipcb.pt:10400.11/867
Description
Summary:Five granitic rocks, concentrically disposed from core to rim, were distinguished in the Castelo Branco pluton. U-Pb-Th electron microprobe monazite ages from granitic rocks are similar and ranging between 297-303 Ma. The granitic rocks from Castelo Branco pluton are 310 ± 1 Ma old, obtained by U-Pb (ID-TIMS) in separated zircon and monazite crystals, indicating a similar emplacement age for all granitic rocks of the pluton. Initial 87Sr/86Sr isotopic ratios and εNd310 and δ18O values suggest three distinct pulses of granitic magma and that they are derived from partial melting of heterogeneous metasedimentary materials. The other granitic rocks are related by magmatic differentiation and show small variations in (87Sr/86Sr)310, εNd310 and δ18O. The granitic pluton of Castelo Branco shows a rare reverse zoning.

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