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The Miocene igneous rocks in the Basal Unit of Lavrion (SE Attica, Greece): petrology and geodynamic implications

NIKOS SKARPELIS^*,*, BASILIOS TSIKOURAS and GEORGIA PE-PIPER

^* Department of Geology & Geoenvironment, University of Athens, Panepistimiopoli, 157 84 Zografou, Athens, Greece
Department of Geology, Section of Earth Materials, University of Patras, 265 00 Patras, Greece
Department of Geology, Saint Mary’s University, Halifax, NS B3H 3C3, Canada

View larger version (43K): [in this window] [in a new window]   Figure 1. Geographic map of the south Aegean region indicating the extent of the Attic–Cycladic Belt (ACB) and locations discussed in the text.

View larger version (32K): [in this window] [in a new window]   Figure 2. Simplified geological map of eastern Attica and south Evia island (modified after Marinos & Petrascheck, 1956; Katsikatsos et al. 1986 and Shaked, Avigad & Garfunkel, 2000).

View larger version (60K): [in this window] [in a new window]   Figure 3. Geological map of Plaka area (thickness and length of dykes not to scale).

View larger version (46K): [in this window] [in a new window]   Figure 4. Schematic, roughly NNW–SSE-oriented, tectonostratigraphic section showing the setting of the Miocene intrusive rocks in the Basal Unit and the sills of S-type porphyries (west Plaka area).

View larger version (8K): [in this window] [in a new window]   Figure 5. (a) Plot of aluminium saturation index (ASI) ratio v. SiO2 for the analysed rocks, on a volatile-free basis. (b) Plot of Shand’s index (ANK: molar Al2O3/(Na2O+K2O) v. A/CNK: molar Al2O3/(CaO+Na2O+K2O)) for the analysed dyke rocks and the granodiorite stock (on a volatile-free basis).

View larger version (13K): [in this window] [in a new window]   Figure 6. Selected Harker variation diagrams of elements v. SiO2 for the analysed rocks (on a volatile-free basis).

View larger version (11K): [in this window] [in a new window]   Figure 7. Primitive Upper Mantle-normalized spider diagrams for: (a) the dyke rocks (this study) and (b) the granodiorite stock (data from Altherr & Siebel, 2002 and this study). Normalizing values after Sun & McDonough (1989).

View larger version (12K): [in this window] [in a new window]   Figure 8. Chondrite-normalized REE patterns for: (a) the dyke rocks (this study), (b) the granodiorite stock (data from Altherr & Siebel, 2002 and this study) and (c) the Hercynian, Naxos paragneiss and orthogneiss for comparison (after Pe-Piper, 2000).

View larger version (11K): [in this window] [in a new window]   Figure 9. Plots of 147Sm/144Nd v. Nd and Nd v. SiO2 for the Lavrion igneous rocks, the Central Aegean plutons (after Altherr & Siebel, 2002), and the western pluton and the leucogranite of Naxos (after Pe-Piper, 2000).