DYNAMICS and ACTIVE PROCESSES - International Lithosphere ...

Figure 2 - Detailed localisation and lithologic sections of Piluri, Muzina and Vanister
The vertical evolution of sediments in Muzina and Piluri begin with fine-grained beds at
the base of the unit t1 (figure 2). Then the sediments of the unit 1 become coarser until the
first slumped level S1. In Piluri-ENE a locally deformed level was detected in unit t1. Above,
the stratified t2, t3 and t4 units are composed by beds with similar facies than at the top of the
unit t1.
Discussion-Conclusion
The fine- to coarse-grained sequences described above display characteristics relative to
turbiditic sequences: 1) moderate bioturbation localised in thinner intervals contrary to
complete bioturbation in contourites (Stow et al. 1998); 2) the scarcity of bottom marks
typical to calciturbidites; 3) the presence of metric levels of rudites, inverse grading which
exclude storm deposits; 4) the presence of cherts as nodule or continuous beds (Einsele et al.,
1991); 5) the sedimentary structures succession as in Bouma’s intervals (1962) resulting of a
decelarating currents. The cobbly levels above S1 and S3 levels seem to show the progressive
transformation of the mass slide into mass flow. Comparing the three outcrops, lateral
variations appear implying a proximal character for Piluri: i) the turbidites are thicker and
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