Sedimentology; Limnogeology; Redox conditions; Fe isotopes; micro-stratigraphy; Paleoclimate; Lake Fagnano; diagenesis
Thomas Camille, Francke Alexander, Vogel Hendrik, Wagner Bernd, Ariztegui Daniel (2020), Weak Influence of Paleoenvironmental Conditions on the Subsurface Biosphere of Lake Ohrid over the Last 515 ka, in Microorganisms
, 8(11), 1736-1736.
Kanellopoulos Christos, Thomas Camille, Xirokostas Nikolaos, Ariztegui Daniel (2018), Banded Iron Travertines at the Ilia Hot Spring (Greece): An interplay of biotic and abiotic factors leading to a modern Banded Iron Formation analog?, in The Depositional Record
NeugebauerIna, ThomasCamille, WaldmannNicolas D, RecasensCristina, ArizteguiDaniel (2018), Cyclic preservation of Fe/Mn-redox fronts in sediments of an oligotrophic, ventilated deep-water lake (Lago Fagnano, Tierra del Fuego), in EarthArXiv
ThomasCamille, ArizteguiDaniel (2018), Fluid inclusions from the deep Dead Sea sediment provide new insights on Holocene extreme microbial life., in EarthArXiv
Thomas Camille, Grossi Vincent, Antheaume Ingrid, Ariztegui Daniel, Bacterial recycling of archaeal biomass as a new strategy for extreme life in Dead Sea deep sediments, in EarthArXiv
Under the pressure of human-induced climate change, it is essential to better understand the past natural climate variability. A broader global coverage of high-resolution palaeoclimatic proxy (indicator) data is urgently needed to improve climate projections and adaptation strategies to changing climate and environmental stress. Laminated lake sediments provide valuable palaeoclimatic information. This project aims to develop the innovative methodology of stable iron isotope measurements of laminated lake sediments as a novel proxy for past changes in temperature and wind and/or dominant diagenetic paths. Only recently, first studies have hinted that variations in stable iron isotopes of marine and lake sediments reflect changing redox conditions in oceans and lakes, possibly linked to variations in past wind and/or temperature. This project aims to test the hypothesis of a redox-climate-relationship mirrored in iron isotopes. The project will be carried out on existing sediment cores from Lago Fagnano (Tierra del Fuego, Argentina) exhibiting characteristic iron-rich laminae that are most suitable for the approach. In a multidisciplinary perspective, a combination of ultrahigh-resolution micro-facies analysis by thin section microscopy and micro-X-ray-fluorescence elemental scanning will be applied to fullyunderstand the general sedimentological and geochemical processes and, specifically, possible seasonal/climatic variations influencing the formation and deposition of iron-bearing minerals in the lake. Additionally, specific microbial communities will be investigated to constrain the effects of syngenetic and diagenetic processes on iron isotopes.The gained knowledge will then be linked with mineral-selective iron isotope measurements to infer the sensitivity of stable iron isotopes to capture climatic variations. The interdisciplinary perspective of this project is designed to advance the innovative field of iron isotope geochemistry and its application to paleoclimate reconstruction.