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The tectono-sedimentary evolution of the Pelagonian Carbonate-Platform-Complex (Late Triassic - Late Jurassic, Evvoia, Greece)

Scherreiks R., Bosence D., Boudagher-Fadel M.

Volumina Jurassica

2006

Vol. 4, no. 1

64-66

Carbonate platforms are sensitive recorders of tectonic environments. However, the tectonosedimentary interplay between ancient carbonate platforms and ocean basins is not always recognizable as the oceans involved are not often preserved. In the case of the Pelagonian Carbonate-Platform-Complex, volcano-sedimentary successions of the one-time adjacent Maliac-Vardar Ocean (Stampfli et al. 2001) are partly preserved. These Late Triassic and Jurassic ocean floor deposits and their contemporaneous platform carbonates are being investigated in Evvoia, Greece (Fig. 1) (Scherreiks 2000; Gingins & Schauner 2005; Bosence et al. 2006). The carbonates exceed 1000 m in thickness whereas the contemporaneous oceanic succession of pillow basalt, radiolarite and pelagic carbonates is only about 100 m thick. The investigation shows that the Pelagonian platform-complex is composed of a number of different carbonate platform types (sensu Bosence 2005; Fig. 2). These evolved adjacent to five changing oceanictectonic settings which affected platform subsidence and uplift. 1. Late Triassic seafloor spreading was accompanied by the slow subsidence of a passive margin platform dominated by peritidal carbonates. 2. Late Liassic convergence coincided with stepped-up subsidence and the formation of a drowned or hemipelagic platform. 3. Initial collision during Early Kimmeridgian most likely caused platform tilting, enabling patch-reef development in the midst of the hemipelagic environment. 4. Early Tithonian obduction was contemporaneous with the formation of thrust-top platforms with associated neritic-reefal turbidite and debrite facies, intercalated in pelagic facies. 5. Advanced obduction, in the Late Tithonian, caused rapid subsidence and complete drowning of the platform complex below the CCD.