Sediments on the Tyrrhenian Abyssal Plain

摘要: Coring and acoustic-reflection data show that coarse-grained sediment layers are remarkably continuous throughout the Tyrrhenian Abyssal Plain. Contrasts in acoustic impedance at interfaces of these with finer pelagic clay produce discrete sub-bottom echoes have been correlated situ strata by coring. Observations grain size, bed thickness, mineralogy used to identify origin transportation routes for two distinct types sand. One type consists eolian-transported tephra; several individual beds tentatively historic volcanic eruptions. The other appears transported through submarine canyons abyssal plain turbidity currents. Three extensive turbidite traced Naples Canyon, one layer a canyon originating off eastern coast Sardinia. Photographs sea floor on no evidence bottom currents; however, those mouth Canyon depict large sand waves drifted sediments which suggest strong transient currents recently flowed there. vast areal extent within supports hypothesis arrive sufficient energy pond their suspension over basin floor. Seismic-reflection records indicate this process has active modern history Basin, more than 1000 m accumulated its deepest depression.