- Mechthild Doll
Allgemeine Geologie - Marine Geologie
- Marine geology
- Mud volcanism
- Fluid seepage
- Gas hydrates
- Hydrothermal systems
Calabrian Arc Mud Volcanoes - Deep Origin, internal Structure and Activity
Mud volcanoes (MVs) may be found in marine and terrestrial geological settings but are predominantly known from compressional tectonic regimes (e.g. accretionary wedges). In general, mud volcanism is driven by the upward migration of overpressured fluids inducing a sediment mobilization and the extrusion of fluids and solids, as mud breccia, onto the surface. The repeating extrusion of mud breccia leads to a build-up of an edifice from which individual mudflows may progress downslope. MVs are typically linked to hydrocarbon systems and, under certain temperature and pressure conditions, able to host gas hydrates within the sediment.
The Calabrian Arc is situated in the Eastern Mediterranean Sea east of Sicily. About 54 distinct MVs have been identified in this region. The general role of the Calabrian Arc MVs is relatively poorly understood but its presence can be easily related to an accretionary complex extending over 1500 km from Calabria to Cyprus.
The PhD Project is focusing on a better understanding of the deep origin, internal structure, temporal evolution and activity of the Calabrian Arc MVs using sedimentological and geophysical data of three expeditions (M112, POS499, POS515). High resolution bathymetry data are used to characterize mudflows and distinguish individual seafloor expressions of the MVs. In addition, backscatter data are used to identify mudflows in the shallow seabed. Moreover, the interpretation of 2D and 3D seismic data is used to describe the deeper structure of the MVs in the Calabrian Arc in more detail. Finally, sediment cores are examined to describe the activity and individual mud extrusion events of the individual MVs over the past. On sediment cores, further analyses as e.g. tephrochronology and 14C dating methods are used to get a better understanding of the individual MV history.
The results contribute to a better understanding of the formation and evolution of Calabrian Arc MVs as well as the tectonic activity behaviour in the Eastern Mediterranean Sea. Moreover, the results will improve the knowledge about MVs in terms of ongoing changes and to reconstruct its evolution over the past.
|03/2019 - present||
PhD student in the working group General Geology - Marine Geology, Marum/University of Bremen, Germany
PhD Thesis: Calabrian Arc Mud Volcanoes - Deep Origin, internal Structure and Activity
|10/2015 - 02/2018||
Master of Sciences in Marine Geosciences at the University of Bremen, Germany
Master Thesis: Disturbed temperature-depth profiles in gas hydrate-bearing sediments - Effects of phase transformation
|02/2016 - 07/2016||Semester abroad, Master of Sciences Earth Sciences at the University of Waikato, Hamilton, New Zealand|
|10/2011 - 07/2015||
Bachelor of Sciences in Geosciences at the University of Bremen, Germany
Bachelor Thesis: High resolution multi-channel seismic and acoustic investigations of the Helgoland Mud Area in the Southern German Bight, North Sea
|09/2016 - 10/2016||RV Polarstern Cruise PS101, Karasik Seamount expedition, Alfred-Wegener-Institute Bremerhaven. Cruise Report PS101|
|06/2015 - 07/2015||RV Sonne Cruise SO241, MAKS expedition Guaymas Basin, Geomar Helmholtz Centre for Ocean Research Kiel. Cruise Report SO241|
|07/2014 - 08/2014||RV Polarstern Cruise PS86, Aurora vent field expedition, Alfred-Wegener-Institute Bremerhaven. Cruise Report PS86|
Sarkar, S., Moser, M., Berndt, C., Doll, M., Böttner, C., Chi, W.-C., Klaeschen, D., Galerne, C., Karstens, J., Geilert, S., Mortera-Gutierrez, C., Hensen, C. (2022) Thermal state of the Guaymas Basin derived from gas hydrate bottom simulating reflections and heat flow measurements. Journal of Geophysical Research: Solid Earth (accepted, in production). https://doi.org/10.1029/2021JB023909
Lagostina, L., Frandsen, S., MacGregor, B., Glombitza, C., Deng, L., Fiskal, A., Li, J., Doll, M., Geilert, S., Schmidt, M., Scholz, F., Bernasconi, S. M., Jorgensen, B. B., Hensen, C., Teske, A., Lever, M. A. (2021) Interactions between temperature and energy supply drive microbial communities in hydrothermal sediment. Communications biology, 4 (1006). https://doi.org/10.1038/s42003-021-02507-1
Dziadek, R., Doll, M., Warnke, F., Schlindwein, V. (2021) Towards Closing the Polar Gap: New Marine Heat Flow Observations in Antarctica and the Arctic Ocean. Geosciences, 11 (11). https://doi.org/10.3390/geosciences11010011
Geilert, S., Hensen, C., Schmidt, M., Liebetrau, V., Scholz, F., Doll, M., Deng, L., Fiskal, A., Lever, M. A., Su, C.-C., Schloemer, S., Sarkar, S., Thiel, V., Berndt, C. (2018) On the formation of hydrothermal vents and cold seeps in the Guaymas Basin, Gulf of California. Biogeosciences, 15: 1-17. https://doi.org/10.5194/bg-15-5715-2018
Møller, M. H., Glombitza, C., Lever, M. A., Deng, L. Morono, Y., Ignaki, F., Doll, M., Su, C.-C., Lomstein, B.A. (2018) D:L-Amino Acid Modeling Reveals Fast Microbial Turnover of Days to Months in the Subsurface Hydrothermal Sediment of Guaymas Basin. Frontiers in Microbiology 9 (967). https://doi.org/10.3389/fmicb.2018.00967
Berndt, C., Hensen, C., Mortera-Gutierrez, C., Sarkar, S., Geilert, S., Schmidt, M., Liebetrau, V., Kipfer, R., Scholz, F., Doll, M., Muff, S., Karstens, J., Planke, S., Petersen, S., Böttner, C., Chi, W.-C., Moser, M., Behrendt, R., Fiskal, A., Lever, M. A., Su, C.-C., Deng, L., Brennwald, M. S., Lizzeralde, D. (2016) Rifting under steam – how rift magmatism triggers methane venting from sedimentary basins, Geology, Vol. 44 (9):767-770. https://doi.org/10.1130/G38049.1