Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (9) Citing Articles via Google Scholar Google Scholar Articles by PE-PIPER, G. Search for Related Content GeoRef GeoRef Citation

Origin of S-type granites coeval with I-type granites in the Hellenic subduction system, Miocene of Naxos, Greece

Department of Geology, Saint Mary's University, Halifax, Canada B3H 3C3

e-mail: GPiper{at}stmarys.ca

The island of Naxos in the Cyclades preserves a core complex developed by Miocene detachment faulting associated with extension of continental crust inboard of the Hellenic subduction zone. The extension has unroofed Miocene hornblende-biotite granite and leucogranite, previously defined as I-type and S-type granite respectively. Crystalline basement exposed by extension includes partially migmatised ortho- and paragneisses principally with Hercynian protolith ages and intercalated high-grade metasedimentary and metavolcanic rocks with Mesozoic protoliths. Most leucogranites, in addition to quartz, feldspar and biotite contain muscovite, tourmaline and garnet (almandine-spessartine). Mineral assemblages suggest crystallisation pressures < 2.5 kbar, with stability of muscovite and tourmaline resulting from high B, Mn and possibly F in the magma. Two types of leucogranite can be distinguished on the basis of rock chemistry, mineral chemistry and Nd/Sm isotopes. Earlier leucogranites (type II) have high LREE:HREE ratio, high LILE, low Y and Nb and _Nd -10 and appear to be a partial melting product of Hercynian paragneiss. Leucogranite dykes within the I-type granite appear similar. Later leucogranites (types Ia, Ib) have low LREE:HREE ratio and _Nd -7 and appear to be derived from melting of both Hercynian paragneisses and younger metasediments. The major element composition of rare leucogranite type Ic suggests derivation from partial melting of orthogneiss. These varied sources result in significant variation in mineral assemblages in the leucogranites.

Key-words: Greece, Cyclades, leucogranite, tourmaline, garnet, Nd isotopes, I-type granite, S-type granite.

This article has been cited by other articles:

				A. LIATI, N. SKARPELIS, and G. PE-PIPER Late Miocene magmatic activity in the Attic-Cycladic Belt of the Aegean (Lavrion, SE Attica, Greece): implications for the geodynamic evolution and timing of ore deposition Geological Magazine, September 1, 2009; 146(5): 732 - 742. [Abstract] [Full Text] [PDF]

				M. A. Edwards and B. Grasemann Mediterranean snapshots of accelerated slab retreat: subduction instability in stalled continental collision Geological Society, London, Special Publications, January 1, 2009; 311(1): 155 - 192. [Abstract] [Full Text] [PDF]

				N. SKARPELIS, B. TSIKOURAS, and G. PE-PIPER The Miocene igneous rocks in the Basal Unit of Lavrion (SE Attica, Greece): petrology and geodynamic implications Geological Magazine, January 1, 2008; 145(1): 1 - 15. [Abstract] [Full Text] [PDF]

				V. Cvetkovic, G. Poli, G. Christofides, A. Koroneos, Z. Pecskay, K. Resimic-Saric, and V. Eric The Miocene granitoid rocks of Mt. Bukulja (central Serbia): evidence for pannonian extension-related granitoid magmatism in the northern Dinarides European Journal of Mineralogy, July 1, 2007; 19(4): 513 - 532. [Abstract] [Full Text] [PDF]

				G. Pe-Piper and D. J. W. Piper Late Miocene igneous rocks of Samos: the role of tectonism in petrogenesis in the southeastern Aegean Geological Society, London, Special Publications, January 1, 2007; 291(1): 75 - 97. [Abstract] [Full Text] [PDF]

				G. Pe-Piper and D. J.W. Piper Unique features of the Cenozoic igneous rocks of Greece Geological Society of America Special Papers, January 1, 2006; 409(0): 259 - 282. [Abstract] [Full Text] [PDF]

				I. K. Koukouvelas, I. K. KOUKOUVELAS, and S. KOKKALAS Emplacement of the Miocene west Naxos pluton (Aegean Sea, Greece): a structural study Geological Magazine, January 1, 2003; 140(1): 45 - 61. [Abstract] [Full Text] [PDF]

				G. Pe-Piper, G. PE-PIPER, and D. J. W. PIPER Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models Geological Magazine, November 1, 2001; 138(6): 653 - 668. [Abstract] [Full Text] [PDF]