Deltaic sedimentation in a rift valley lake: new seismic reflection data from Lake Malawi (Nyasa), East Africa

C. A. Scholz; T. C. Johnson; J. W. McGill

doi:10.1130/0091-7613(1993)021<0395:DSIARV>2.3.CO;2

Deltaic sedimentation in a rift valley lake: new seismic reflection data from Lake Malawi (Nyasa), East Africa

C. A. Scholz, T. C. Johnson, J. W. McGill

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29 Scopus citations

Abstract

Gross variations appear to be controlled by tectonic-setting. Border-fault margin and accommodation-zone margin deltas have steeply sloping depositional surfaces, acoustic signatures dominated by chaotic seismic facies, and an overall aggradational character. Shoaling margin deltas that are opposite the main border faults and axial-margin deltas that parallel the rift axis have slopes generally <1°, are dominated by continuous reflections, and display distinctive progradational character. Lake-level fluctuations on the order of hundreds of metres have severely modified each delta. -from Authors

Original language	English (US)
Pages (from-to)	395-398
Number of pages	4
Journal	Geology
Volume	21
Issue number	5
DOIs	https://doi.org/10.1130/0091-7613(1993)021<0395:DSIARV>2.3.CO;2
State	Published - Jan 1 1993
Externally published	Yes

ASJC Scopus subject areas

Geology

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10.1130/0091-7613(1993)021<0395:DSIARV>2.3.CO;2

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AU - Johnson, T. C.

AU - McGill, J. W.

PY - 1993/1/1

Y1 - 1993/1/1

N2 - Gross variations appear to be controlled by tectonic-setting. Border-fault margin and accommodation-zone margin deltas have steeply sloping depositional surfaces, acoustic signatures dominated by chaotic seismic facies, and an overall aggradational character. Shoaling margin deltas that are opposite the main border faults and axial-margin deltas that parallel the rift axis have slopes generally <1°, are dominated by continuous reflections, and display distinctive progradational character. Lake-level fluctuations on the order of hundreds of metres have severely modified each delta. -from Authors

AB - Gross variations appear to be controlled by tectonic-setting. Border-fault margin and accommodation-zone margin deltas have steeply sloping depositional surfaces, acoustic signatures dominated by chaotic seismic facies, and an overall aggradational character. Shoaling margin deltas that are opposite the main border faults and axial-margin deltas that parallel the rift axis have slopes generally <1°, are dominated by continuous reflections, and display distinctive progradational character. Lake-level fluctuations on the order of hundreds of metres have severely modified each delta. -from Authors

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Deltaic sedimentation in a rift valley lake: new seismic reflection data from Lake Malawi (Nyasa), East Africa

Abstract

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