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Granitoid rocks of Naxos, Greece: regional geology and petrology
Author(s) -
PEPIPER GEORGIA,
KOTOPOULI C. N.,
PIPER DAVID J. W.
Publication year - 1997
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/(sici)1099-1034(199706)32:2<153::aid-gj737>3.0.co;2-1
Subject(s) - leucogranite , geology , pluton , gneiss , geochemistry , migmatite , protolith , felsic , hornblende , biotite , petrology , mafic , igneous rock , metamorphic core complex , zircon , metamorphic rock , extensional definition , paleontology , tectonics , quartz
Granitic gneiss in a Miocene extensional core complex on Naxos locally preserves primary igneous textures. On an outcrop scale, these include mafic enclaves; in thin section, feldspar phenocrysts contain unoriented accessory mineral inclusions. The gneiss is interpreted as having a Hercynian granite protolith. Contrary to previous accounts, migmatites are rare in the gneiss. The granite is geochemically similar to post‐collisional extension‐related granites and differs from the predominant granodiorites found in the Hercynian basement of northwestern Greece. An I‐type hornblende–biotite granite pluton was emplaced during Miocene extension in western Naxos. It is a typical subduction‐related pluton emplaced under conditions of back‐arc extension. The pluton is cut by later leucogranite that geochemically resembles the granite dykes that cut the migmatites. In northern Naxos, minor leucogranite intrusions are of two geochemical types. One is everywhere deformed and geochemically resembles the leucogranite that cuts the Western pluton. The other is variably deformed and new geochronology shows that it has an age of 10 Ma. © 1997 John Wiley & Sons, Ltd.