The Late Triassic and Jurassic platform and the oceanic complexes in
Evvoia, Greece, share a complementary plate-tectonic evolution. Shallow
marine carbonate deposition responded to changing rates of subsidence
and uplift, whilst the adjacent ocean underwent spreading, and then
convergence, collision and finally obduction over the platform complex.
Late Triassic ocean spreading correlated with platform subsidence and
the formation of a long-persisting peritidal passive-margin platform.
Incipient drowning occurred from the Sinemurian to the late Middle
Jurassic. This subsidence correlated with intra-oceanic subduction and
plate convergence that led to supra-subduction calc-alkaline magmatism
and the formation of a primitive volcanic arc. During the Middle
Jurassic, plate collision caused arc uplift above the carbonate
compensation depth (CCD) in the oceanic realm, and related
thrust-faulting, on the platform, led to sub-aerial exposures.
Patch-reefs developed there during the Late Oxfordian to Kimmeridgian.
Advanced oceanic nappe-loading caused platform drowning below the CCD
during the Tithonian, which is documented by intercalations of reefal
turbidites with non-carbonate radiolarites. Radiolarites and
bypass-turbidites, consisting of siliciclastic greywacke, terminate the
platform succession beneath the emplaced oceanic nappe during late
Tithonian to Valanginian time.