Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/3942
Title: Geochemistry of the Rio Espinharas hybrid complex, northeastern Brazil
Authors: Campos, T. F. C. 
Neiva, A. M. R. 
Nardi, L. V. S. 
Keywords: Hybrid rocks; Granites; Microgranular enclaves; Geochemistry; Rb-Sr isotopes
Issue Date: 2002
Citation: Lithos. 64:3-4 (2002) 131-153
Abstract: The Rio Espinharas pluton, northeastern Brazil, belongs to the shoshonitic series and consists mainly of syenogranite, quartz-monzonite and porphyritic quartz-monzonite, but diorite, quartz-monzodiorite, quartz-syenite and microsyenogranite also occur containing microgranular enclaves, except for the diorite. Most variation diagrams of rocks, amphiboles, biotites and allanites show linear trends, but K, Zr, Sr and Ba of rocks display curved scattered trends. The rocks ranging from diorite to syenogranite define a pseudo-errorchron and have similar REE patterns. Syenogranite and microsyenogranite are derived from two distinct pulses of granite magma with initial 87Sr/86Sr ratio of 0.7083±0.0003 and 0.7104±0.0007, respectively. Modelling of major and trace elements shows that the syenogranite evolved by fractional crystallization of plagioclase, microcline, edenite, biotite and titanite, whereas quartz-monzonite, porphyritic quartz-monzonite, quartz-monzodiorite and quartz-syenite resulted from simple mixing between an upper mantle-derived dioritic magma and the upper crust-derived syenogranite magma. Dioritic enclaves are globules of a mafic magma from the upper mantle.
URI: http://hdl.handle.net/10316/3942
DOI: 10.1016/S0024-4937(02)00199-8
Rights: openAccess
Appears in Collections:FCTUC Ciências da Terra - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
file526c5b246fcb41748eace94130772d3d.pdf873.23 kBAdobe PDFView/Open
Show full item record

WEB OF SCIENCETM
Citations

10
checked on Aug 2, 2022

Page view(s) 50

457
checked on Aug 3, 2022

Download(s)

241
checked on Aug 3, 2022

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.