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Geochemical and isotopic constraints on petrogenesis: The Serra da Freita pluton, a typical granite body from the Portuguese Hercynian collision belt

1991; Geological Society of America; Volume: 103; Issue: 3 Linguagem: Inglês

10.1130/0016-7606(1991)103 2.3.co;2

1943-2674

R. J. Reavy, W. E. Stephens, Anthony E. Fallick, Alex N. Halliday, Μ. M. Godinho,

Geological and Geochemical Analysis

Research Article| March 01, 1991 Geochemical and isotopic constraints on petrogenesis: The Serra da Freita pluton, a typical granite body from the Portuguese Hercynian collision belt R. J. REAVY; R. J. REAVY 1Department of Geology, University of St. Andrews, St. Andrews, Fife, KY16 9ST, United Kingdom Search for other works by this author on: GSW Google Scholar W. E. STEPHENS; W. E. STEPHENS 1Department of Geology, University of St. Andrews, St. Andrews, Fife, KY16 9ST, United Kingdom Search for other works by this author on: GSW Google Scholar A. E. FALLICK; A. E. FALLICK 2Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow, G75 0QU, United Kingdom Search for other works by this author on: GSW Google Scholar A. N. HALLIDAY; A. N. HALLIDAY 2Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow, G75 0QU, United Kingdom Search for other works by this author on: GSW Google Scholar M. M. GODINHO M. M. GODINHO 3Museu e Laboratorio Mineralogico e Geologico, Universidade de Coimbra, 3000 Coimbra, Portugal Search for other works by this author on: GSW Google Scholar Author and Article Information R. J. REAVY 1Department of Geology, University of St. Andrews, St. Andrews, Fife, KY16 9ST, United Kingdom W. E. STEPHENS 1Department of Geology, University of St. Andrews, St. Andrews, Fife, KY16 9ST, United Kingdom A. E. FALLICK 2Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow, G75 0QU, United Kingdom A. N. HALLIDAY 2Isotope Geology Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow, G75 0QU, United Kingdom M. M. GODINHO 3Museu e Laboratorio Mineralogico e Geologico, Universidade de Coimbra, 3000 Coimbra, Portugal Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1991) 103 (3): 392–401. https://doi.org/10.1130/0016-7606(1991)103 2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation R. J. REAVY, W. E. STEPHENS, A. E. FALLICK, A. N. HALLIDAY, M. M. GODINHO; Geochemical and isotopic constraints on petrogenesis: The Serra da Freita pluton, a typical granite body from the Portuguese Hercynian collision belt. GSA Bulletin 1991;; 103 (3): 392–401. doi: https://doi.org/10.1130/0016-7606(1991)103 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Hercynian Serra da Freita pluton in north-central Portugal is emplaced within a sillimanite-bearing flychoid sequence of graywackes and pelitic schists, here tested as a possible protolith for the granite. There is a marked overlap in most major-element values between the schists and the granite; however, high K values preclude anatexis of pelite, and the 3-fold Na enrichment shown by the granites could be achieved by 25%-30% partial melting of immature graywacke. Depletions of Ba, Nb, Ce, Zr, Ti, and Y in the granite reflect retention of these elements in the source. Restite separation may have occurred to some limited extent; however, enrichment in Rb may be due to late-stage fractional crystallization. Overlapping δ18O values for both schists and granites at +10‰ to +14‰, combined with an initial 87Sr/86Sr of 0.7136 for the pluton, strongly support the local graywacke-rich Beira Schists as the most likely protolith for this strongly peraluminous granite magma. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.