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Geological Society, London, Special Publications; 1988; v. 40; p. 153-158;
DOI: 10.1144/GSL.SP.1988.040.01.14
© 1988 Geological Society of London

Part II Palaeoenvironmental Indicators

Palaeo-environment information from deep water siderite (Lake of Laach, West Germany)

B. Bahrig

Institut für Wasserforschung, Zum Kellerbach 52, D-5840 Schwerte—Geisecke, West Germany

A comparative study from modern and ancient sediments from the Lake of Laach was performed by means of chemical and stable isotope analyses. In the modern environment siderite is precipitated around CO2-spring vents. In contrast, siderite from the Pleistocene/Holocene boundary occurs as small layers in a varved sequence. The stable isotope data provide strong evidence for an analogous formation of both types of siderite. The different CO2 sources of the siderites allow reconstruction of a distinct rise of productivity at the Pleistocene/Holocene transition. It is proposed that siderite may be developed as a useful tool for tracing both palaeo-environmental and early diagenetic processes.