Detrital Modes of the Ionian Forearc Basin Fill (Oligocene-Quaternary) Reflect the Tectonic Evolution of the Calabria-Peloritani Terrane (Southern Italy)

摘要

During Oligocene–Neogene time, the Calabria–Peloritani terrane (CPT), a small block of continental lithosphere, rifted from the southern margin of the Eurasian continent and drifted southeastward to collide with the African continent. Along the leading edge of the CPT, a late Oligocene to Quaternary, mostly siliciclastic succession (> 2,000 meters thick) was deposited in the Ionian forearc basin. The detritus forming the succession was derived directly from the erosion of the nearby CPT, composed of Hercynian plutons intruding metasedimentary host rocks. Contrary to most modern and ancient forearc basins, penecontemporaneous volcanic detritus is virtually absent; this results from rift-related topographic barriers which separated the forearc basin from the associated volcanic arc.