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Petrochemistry of a Series of Granitic Rocks from Northern Portugal

1971; Geological Society of America; Volume: 82; Issue: 10 Linguagem: Inglês

10.1130/0016-7606(1971)82[2783

1943-2674

Carlos A.R. De Albuquerque,

Archaeological and Geological Studies

Research Article| October 01, 1971 Petrochemistry of a Series of Granitic Rocks from Northern Portugal CARLOS A. R de ALBUQUERQUE CARLOS A. R de ALBUQUERQUE Department of Geology, Saint Mary's University, Halifax, Nova Scotia Search for other works by this author on: GSW Google Scholar Author and Article Information CARLOS A. R de ALBUQUERQUE Department of Geology, Saint Mary's University, Halifax, Nova Scotia Publisher: Geological Society of America Received: 11 Sep 1970 Revision Received: 29 Mar 1971 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1971, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1971) 82 (10): 2783–2798. https://doi.org/10.1130/0016-7606(1971)82[2783:POASOG]2.0.CO;2 Article history Received: 11 Sep 1970 Revision Received: 29 Mar 1971 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation CARLOS A. R de ALBUQUERQUE; Petrochemistry of a Series of Granitic Rocks from Northern Portugal. GSA Bulletin 1971;; 82 (10): 2783–2798. doi: https://doi.org/10.1130/0016-7606(1971)82[2783:POASOG]2.0.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 batholith of central and northern Portugal and adjacent parts of Spain is dominantly calc-alkalic granodiorite and granite. Minor massifs of gabbroic to tonalitic rocks occur locally associated with these granitic rocks.In this paper, the origins of some of these mafic bodies and of the granite itself are discussed.Analytical data for both major and trace elements are presented for a series of rocks, from the Aregos region, northern Portugal, ranging from hornblende-biotite tonalite to muscovite-biotite granite.This series shows a distribution of major and trace elements paralleling those observed in series of differentiation of calc-alkalic rocks. However, the more mafic rocks, in particular, show variations in their element contents incompatible with an origin by differentiation.The tonalites and most granodiorites of the series are hybrid rocks formed by reaction of a granitic magma with mafic material. The petrographic and chemical evidence show that the granites crystallized from a melt, and the origin by anatexis of this granitic magma is discussed.The distribution of trace elements in the rocks of this hybrid series is largely conditioned by fractionation by the mineral phases and, therefore, the trends of variation are similar to those observed in other series, whereas the contents of some elements (Na, Li, Rb, Cs) for comparable rock types, are different, giving the Aregos series some distinctive geochemical features. 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.