Abstract
The Menes caldera is a fault-controlled depression (~8 km in diameter) at ~3,000 m water depth in the western province of the Nile deep-sea fan off NW Egypt, comprising seven mud volcanoes (MVs) of which two are active. Based on multichannel and chirp seismic data, temperature profiles, and high-resolution bathymetric data collected during the 2000 Fanil, 2004 Mimes and 2007 Medeco2 expeditions, the present study investigates factors controlling MV morphology, the geometry of feeder channels, and the origin of emitted fluids. The active Cheops and Chephren MVs are 1,500 m wide with subcircular craters at their summits, about 250 m in diameter, generally a few tens of metres deep, and filled with methane-rich muddy brines with temperatures reaching 42 °C and 57 °C respectively. Deployments of CTDs and corers with attached temperature sensors tracked these warm temperatures down to almost 0.5 km depth below the brine lake surface at the Cheops MV, in a feeder channel probably only a few tens of metres wide. Thermogenic processes involve the dissolution of Messinian evaporites by warm fluids likely sourced even deeper, i.e. 1.7 and 2.6 km below the seabed at the Cheops and Chephren MVs respectively, and which ascend along listric faults. Seepage activity appears broadly persistent since the initiation of mud volcanism in the Early Pliocene, possibly accompanied by lateral migration of feeder channels.
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Acknowledgements
We are grateful to the officers and crews of the R/V Pelagia and R/V Pourquoi pas? for the successful operations conducted during the Mimes and Medeco2 expeditions respectively. Alain Moreau provided the processed multichannel seismic profiles. We would like to thank Anne Pacault for her assistance in chirp data acquisition and processing, and Laëtitia Brosolo for processing the high-resolution bathymetry maps. Also acknowledged are valuable suggestions and improvements from Patrice Imbert, an anonymous reviewer, as well as the journal editors. MIMES was a part of MEDIFLUX, a cooperative Dutch-French-German programme endorsed and promoted by the European Science Foundation within its EUROMARGINS initiative (contract no. ERAS-CT-2003-980409 of the European Commission, DG Research, FP6). The Netherlands Organisation for Scientific Research (NWO) is thanked for the Dutch financial support within MEDIFLUX through NWO/ALW project 855.01.031. The MEDECO2 cruise was supported and processed thanks to HERMES (EC contract no. GOCE-CT-2005-511234) and HERMIONE (EC contract no. FP7-ENV-2008-1-226354) programmes, funded by the European Commission’s Framework Six and Seven programmes.
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Dupré, S., Mascle, J., Foucher, JP. et al. Warm brine lakes in craters of active mud volcanoes, Menes caldera off NW Egypt: evidence for deep-rooted thermogenic processes. Geo-Mar Lett 34, 153–168 (2014). https://doi.org/10.1007/s00367-014-0367-1
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DOI: https://doi.org/10.1007/s00367-014-0367-1