Editing Thasos (section)

===Geology===
{{technical|section|date=January 2013}}
[[File:Epitropou 4.jpg|thumb|left|200px|Geological and Metallogenic map of Thasos island.]]

The island is formed mainly by [[gneiss]]es, [[schist]]s and [[marble]]s of the [[Rhodope Mountains|Rhodope]] massif. Marble sequences corresponding to the [[Falakro]] marbles intercalated by schists and gneisses, are up to 500&nbsp;m thick and are separated from the underlying gneisses by a transition zone about 300&nbsp;m thick.

The rocks have undergone several periods of regional metamorphism, to at least upper [[amphibolite]] facies, and there was a subsequent phase of retrograde metamorphism. At least three periods of regional deformation have been identified, the most important being large scale [[isocline (geology)|isoclinal folding]] with axes aligned north-west. The T-zone is deformed and is interpreted by some authors as a regional thrust of  pre-major folding age. There are two major high angle fault systems aligned north-west and north-east respectively. A large low-angle thrust cuts the gneiss, schist and marble sequence at the south-west corner of the island, probably indicating an overthrusting of the Serbomacedonian Massif onto the Rodope Massif.

The [[Late Miocene]] oil-producing Nestos-Prinos basin is located between Thassos island and the mainland. The floor of the basin is around 1,500 m deep off the Thassos coast (South Kavala ridge; Proedrou, 1988) and up to 4.000–5.000 m in the axial sector between Thassos and the mainland. The basin is filled with Late Miocene-Pliocene sediments, including ubiquitously repeated evaporite layers of rock salt and anhydrite-dolomite that alternate with sandstones, conglomerates, black shales, and [[uranium|uraniferous]] [[coal measures]] (Proedrou, 1979, 1988; Taupitz, 1985). Stratigraphically equivalent rocks on the mainland are clastic sediments with coal beds, marine to brackish fluvial units and travertines.