Stromatolites represent the oldest forms of life and are commonly defined as laminated organo-sedimentary structures built by the trapping, binding and/or precipitation of minerals via microbial processes. Dead-Sea stromatolites have attracted considerable attention and recently have been used to constrain the late Quaternary lake level curve. This closed-basin contains living and fossil stromatolites at a wide range of water salinity, temperature, oxidation state, and lighting. The basin thus offers a unique opportunity to understand the environmental factors controlling their formation as well as to develop a better chronology for the last glaciation, respectively.
We propose to study recent microbial mats (stromatolites) around the Dead-Sea and identify relationships between the environment and observable characteristics that might be recorded in rocks. Based on stromatolites we have mapped around the Dead-Sea, we will combine a geomorphological and geomicrobiological approach to:
- Better resolve lake level changes by quantifying the variation of water volumes in the Dead-Sea from the Late Pleistocene to the Holocene
- Determine the natural environmental conditions where modern stromatolite types are growing around the Dead-Sea.
- Carry out experimental investigations in the laboratory under controlled conditions, from a nanometric- to a mm-scale.
By dating these microbialites we will provide a more robust chronology of lake level changes as well as their tempo and magnitude. This is critical for developing predictive patterns of the present day Dead-Sea level changes that are of major societal interest. This is also crucial for unraveling conditions at the "agricultural revolution" incurring around the lake during its last recess.
- UNIGE-Department of Earth Science
- Prof. Daniel Ariztegui
- Dr. Ina Neugebauer
- Dr. Camille Thomas
- HUJI-Institute of Earth Science