NDLI: Quantitative mapping of active mud volcanism at the western Mediterranean Ridge-backstop contact

Content Provider	Springer Nature Link
Author	Rabaute, Alain Chamot Rooke, Nicolas
Copyright Year	2007
Abstract	Based on a new quantitative analysis of sidescan sonar data combined with coring, we propose a revised model for the origin for Mediterranean Ridge mud volcanism. Image analysis techniques are used to produce a synthetic and objective map of recent mud flows covering a 640 × 700 km$^{2}$ area, which represents more than half of the entire Mediterranean Ridge mud belt. We identify 215 mud flows, extruded during the last 37,000–60,000 years. This time period corresponds to the limit of penetration of the sonar, that we evaluate through geoacoustic modeling of the backscattered signal returned by the mud breccia-hemipelagites contact, and calibrate by coring. We show that during this period, at least 96% of the mud volume has been extruded at the Mediterranean Ridge-Hellenic backstop contact, the remaining being scattered over the prism. We suggest that the source is a Messinian (5–6 Ma) mud reservoir that remained close to the backstop contact, at variance with the classical transport-through-the-wedge model. A revised mud budget indicates that steady-state input is not needed. We propose that the source layer was deposited in deep and narrow pre-Messinian basins, sealed by Messinian evaporites, and finally inverted in post-Messinian times. Onset of motion of the Anatolia-Aegea microplate in the Pliocene resulted in change from slow to fast convergence, triggering shear partitioning at the edges of the backstop and basin inversion. Mud volcanism initiation is probably coeval with the latest events of this kinematic re-organization, i.e. opening of the Corinth Gulf and activation of the Kephalonia fault around 1–2 Ma.
Starting Page	271
Ending Page	295
Page Count	25
File Format	PDF
ISSN	00253235
Journal	Marine Geophysical Researches
Volume Number	28
Issue Number	3
e-ISSN	15730581
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-09-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mediterranean Ridge Mud volcanism Acoustic characterization Backscatter Geodynamics Messinian evaporites Accretionary prism Backstop Strike-slip faults Offshore Engineering Geosciences Geophysics/Geodesy Oceanography
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics Oceanography

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