- Ader, Magali Pr.
In April 2014, a French research expedition, led by Magali Ader of the Institut de Physique du Globe de Paris, made its first of four planned field expeditions to the Dziani Dzaha lake to begin characterizing the physical chemistry and biology of the lake during different seasons. This crater lake is located in the Comoros Archipelago, a small volcanic hotspot chain in the Indian Ocean between Madagascar and Mozambique. Dziani Dzaha presents a very unusual combination of characteristics making it a likely analog for some hydrocarbon-bearing lacustrine rocks of economic importance and possibly certain Precambrian environments, including expanding rift valleys and basins.
The field team performed on-site measurements of the water chemistry and microorganisms’ metabolic activity. They also sampled gases, waters at various depths, and procured a 1.8-meter-long sediment core for subsurface biodiversity, chemical, mineralogical, and isotopic analyses. DCO support is being provided to the highly leveraged research program to partially cover the cost of 14C analyses of the dissolved inorganic carbon and biomass, and of detrital remains of terrestrial plants found at various levels in the core. These analyses will test the hypothesis that the biomass feeds directly on volcanic CO2 and provide an approximate model age for the core. Information and a short video about the research program and field study is available on the DCO website: https://deepcarbon.net//feature/new-video-field-expedition-indian-ocean#.U-5QEVaF5mo