Seismic Facies, Processes, and Evolution of Miocene Inner Fan Channels, Indus Submarine Fan

  • Timothy R. McHargue
Part of the Frontiers in Sedimentary Geology book series (SEDIMENTARY)


The large size of inner fan channel-levee complexes of the Indus Fan permits the recognition on multifold seismic profiles of distinct seismic facies and depositional and erosional features. The depositional history of inner fan channels is reconstructed based on the relative ages of features within each channel-levee complex. Typically, immediately following avulsion and initiation of inner fan channels, dramatic lateral migration allowed the accumulation of extensive lateral accretion deposits that resemble large versions of meandering fluvial systems. Subsequently, channels aggraded, lateral migration diminished, and levees encroached toward the channel axis. Interpretations suggest that during aggradation, the lateral connectedness of sand bodies, the lateral extent of sand deposition, and the thickness of sand bodies decreased.

The main seismic facies recognized in the Indus Fan are (1) H-C, high-amplitude continuous convergent reflections that occur within wedge-shaped levees, especially away from the channel margin; (2) L-C, low-amplitude continuous convergent reflections that occur within some wedge-shaped levees immediately adjacent to the channel margin; (3) H-D, high-amplitude discontinuous.

This pattern of channel evolution is interpreted to be a response to waning flow volumes and velocities through time. Waning flow is attributed to allogenic events such as small-scale fluctuations of relative sea level, tectonism, and climate.


Sand Body Channel Axis Lateral Migration Seismic Facies Channel Fill 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1991

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  • Timothy R. McHargue

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