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Spontaneous self-combustion of organic-rich lateglacial lake sediments after freeze-drying

Authors
/persons/resource/ndraeger

Dräger,  Nadine
5.2 Climate Dynamics and Landscape Evolution, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/brau

Brauer,  Achim
5.2 Climate Dynamics and Landscape Evolution, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/brademan

Brademann,  B.
5.2 Climate Dynamics and Landscape Evolution, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/tjalling

Tjallingii,  Rik
5.2 Climate Dynamics and Landscape Evolution, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Słowiński,  Michał
External Organizations;

Błaszkiewicz,  Mirosław
External Organizations;

Schlaak,  Norbert
External Organizations;

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Citation

Dräger, N., Brauer, A., Brademann, B., Tjallingii, R., Słowiński, M., Błaszkiewicz, M., Schlaak, N. (2016): Spontaneous self-combustion of organic-rich lateglacial lake sediments after freeze-drying. - Journal of Paleolimnology, 55, 2, 185-194.
https://doi.org/10.1007/s10933-015-9875-x


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1416078
Abstract
We report and investigate for the first time spontaneous self-combustion of freeze-dried lacustrine sediments immediately after ventilation of the vacuum freeze dryer chamber. The smouldering and flameless combustion lasted for approximately 10–20 min and reached temperatures of 357 °C. Self-combustion mainly occurred in aluminium boxes containing sediment bars taken for thin section preparation. About 40 % of these samples were affected, most of them originated from the basal approximately 3-m-thick finely laminated lateglacial sediment interval. The combustion process caused disintegration of siderite to iron oxides (hematite and magnetite) and burning of organic matter to pyrogenic carbon leading to a lowering of total inorganic and organic carbon contents to 1 %. The total sulphur content of one combusted bulk sample did not change, but the alteration of sulphur contents in different sediment components suggests a redistribution of sulphur within the sediment. We assume that the self-combustion process was initiated by exothermic oxidation reactions, which were favoured by a combination of factors including the presence of abundant fine-grained iron sulphides in the organic-rich sediments. Self-combustion could be prevented by ventilating the vacuum chamber after freeze-drying with N2.