Geochemistry of Tinos granite: A window to the Miocene microplate tectonics of the Aegean region
Mastrakas, Nickolaus; St. Seymour, Karen
published: Sep 1, 2000
ArtNo. ESP154017503003, Price: 29.00 €
The Miocene Tinos pluton in the Cyclades area of the Aegean back-arc basin is a shallow level granodiorite (17-14 Ma) with minor, intercalated leucocratic rocks. Near its border, it is intruded by minor leucogranite (12-10 Ma) and aplitic veins. The geochemistry of the lithologies of the pluton indicates that they represent independent batches of partial melts emplaced while the tectonic environment of granite magma ascent and emplacement was evolving continuously from compressional to extensional. The granodiorite magmas were emplaced in a compressional environment. The trace element insignia of the leucocratic phases in the pluton indicates a transitional compressive-extensive setting and the leucogranite indicates an extensive setting. These findings agree with a previous analysis based solely on structural data. Evolution towards extensional tectonics may indicate "indented" morphology of the subducting plates which would result in local oblique convergence and concurrent formation of compressional and extensional domains.