Quantification des flux sédimentaires et de la subsidence du bassin ...

tel-00790852, version 1 - 21 Feb 2013
Figure 12 – RM107
Seismic Profile RM01-107 (Courtesy Melrose Ressources) in TWTT (s) (see location on
figures 1) and interpretation of Pliocene-Quaternary deep-sea fan deposits. Black pins on top
show cross-lines, Well GLP 2 is projected on the profile.
I, II, III: Lower, Intermediate and Upper Series, respectively. I-3: channel/levee system 3 of
Series I (1 to n from the oldest to the youngest). Q10 (in red) and Plio11 (in green) represent
majour erosional boundaries respectiveley between Series I-II and Series II-III. Stratigraphic
interpretation from the shelf correlated to the deep sea suggest ages of 2.7 Ma for Plio11 and
1 Ma for q10 (see discussion). Thin red lines are local erosional unconformities; pink bodies
are local or regional MTDs.
Differencial subsidence is imaged by the inclinaison of the base of salt deposit (in pink).
Local defomation, pull-downs can be observed below canyons, they are artefact due low
water velocities in canyons compared to adjacent sediments. Note that the general
westernward inclination is also observed in underlying deposits (yellow reflectors).
The rate of subsidence is calculated using a duration for Salt and Plioquateranry of 5.6 Ma (an
age agreed by most authors, see CIESM, 2008).