The tectonic and sedimentary evolution of an active rift in high resolution (Corinth Rift, Greece)
The Corinth Rift, Greece, is one of the most active rifts worldwide and a key example of the early rift phase. Since the 1980s, the onshore structure and stratigraphy has been analysed, modern seismicity and geodetic fields constrained, and a dense network of seismic data interpreted within the marine rift basin. The general rift evolution and fault network has been established but detail of the fault and depocentre development are lacking chronology. IODP Expedition 381 sampled the offshore syn-rift sequence in 2017 at 3 boreholes to be integrated with existing seismic data and onshore records, thus generating a rifting record unique in terms of resolution and completeness. The objectives were to determine: a) the structural evolution of the rift; and b) interactions between tectonics and climate on sedimentary and surface processes in an active rift environment. A key element of the syn-rift sequence is the alternation of marine and lake conditions in the Gulf of Corinth (controlled by sea level and tectonics), reflected in the microfossil assemblages and the depositional record. The preliminary results focus on newly resolved fault and rift development rates and timings, and how tectonic processes impact sedimentary processes, sediment flux and basin environment through time.