DCO Project Summary

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Project Title
Dziani Dzaha
Start DateEnd Date
2014-04-01 2014-11-01
NameRoleInstitutionDCO ID
Related GrantsDCO ID
11121/9539-1114-7297-7552-CC
11121/9902-5454-7041-1832-CC
Description

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

Project UpdatesClick to add Project Update

Reporting Year 2012 Click to expand


  • RY2012-1 - submitted on Jun 01, 2012

    Update Details:

    [2012-06-01] Information and a short video about the research program and April field study is available on the DCO website: https://deepcarbon.net//feature/new-video-field-expedition-indian-ocean#.U-5QEVaF5mo

Reporting Year 2015 Click to expand


  • Update 2015: Dziani Dzaha - submitted on Oct 01, 2015

    Update Details:

    There was a third field trip in April 2015 and there will be a fourth one in October 2015.

    The 52 minute documentary by Sebastien Turay will be translated into English soon thanks to DCO funds.

    The cores collected in April 2015 are being progressively processed. They have been sampled, freeze dried and decarbonated. Part of the samples have been analyzed for d13C and d15N of the organic matter and their mineralogy (DRX). A new collaborator (Vincent Grossi, Université de Lyon, France) has joined the project to study the organic molecules useful as biomarkers and their isotope compositions.

Reporting Year 2016 Click to expand


  • Update 2016: Film Featuring DCO Scientists at Lake Dziani Dzaha Part of EGU 2016 GeoCinema - submitted on ,

    Update Details:

    A DCO sponsored film produced by Sur une île was selected for screening at the 2016 EGU General Assembly in Vienna, Austria. Dziani Dzaha presents an 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. A dense population of prokaryotes and cyanobacteria dominates the Dziani Dzaha ecosystem—giving it a permanently green color. Its waters are saline (twice the ocean salinity), alkaline (pH = 9), extremely rich in dissolved inorganic carbon (100 times the amount in seawater), and anoxic below one-meter depth. It also precipitates microbialites, which are organo-sedimentary deposits that accrete as a result of a lake-bottom microbial community, forming the locus for mineral precipitation. View the film here: https://deepcarbon.net/feature/film-featuring-dco-scientists-lake-dziani-dzaha-part-egu-2016-geocinema#.WCShxeErIUE
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