Environmental Engineering Reference
In-Depth Information
during the Paleoproterozoic, followed by the ventilation of the deep water
probably as late as the Neoproterozoic. The early Paleozoic appears to be
characterized by prolonged periods of deep water anoxia. In contrast, short-
term oceanic anoxic events have been identified throughout the Mesozoic.
The eastern Mediterranean sapropel layers represent a prominent example of
Cenozoic anoxic sedimentation.
The temporal evolution of anoxia has been linked to the occurrences of redox
sensitive sediments such as oolitic ironstones [86] or the deposition of stratiform
sulphide deposits [23]. Finally, a causal relationship between oceanic anoxic
events and biological evolution has been proposed, e.g. for the Permian-Triassic
mass extinction.
Acknowledgements
Sincere thanks go to L. Neretin for inviting me to contribute to this volume
and for his patience as an editor. Constructive reviews by Mike Arthur and an
anonymous reviewer improved this manuscript.
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