Abstract
Summary Seven cores taken from 350 m water depth are described, near the foot of a rift valley boundary fault, in the anoxic hypolimnion of Lake Malawi. The sediments average 29and turbidites, 18% largely undisturbed ‘pelagic’ mud and 53% ‘pelagic’ mud disturbed by slumping and bottom currents. Diatom-rich laminae can be correlated between cores and comparison of the lithostratigraphy with limnological records permits age estimation. Sand turbidite bed thickness/maximum grain size ratios are also examined. Blooms of phytoplankton production appear to have made a major contribution to the organic-carbon content in the undisturbed ‘pelagic’ muds.
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