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Journal of the Geological Society; 1998; v. 155; issue.3; p. 429-432;
DOI: 10.1144/gsjgs.155.3.0429
© 1998 Geological Society of London

SPECIAL

Slumps, debris flows and sandy deep-water channel systems: implications for the application of sequence stratigraphy to deep water clastic sediments

B. CRONIN1, D. OWEN1, A. HARTLEY1 & B. KNELLER2

1 Department of Geology and Petroleum Geology, King's College, University of Aberdeen, Aberdeen AB24 3UE, UK (e-mail: cronin{at}abdn.ac.uk)
2 Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK

The Hecho Group is a classic sedimentary system from which turbidite classifications have been defined. This study of mudstone-rich intervals from this group suggests that published models in which Type 2 and 3 systems develop in response to changes in relative sea level or tectonic activity need to be reassessed. Intervals developed between channel/lobe sandstones comprise mud-matrix supported conglomeratic debris flows and/or slump deposits which blanket the underlying sand-rich channel-fills. They record periods of major disturbance and re-organization of the sedimentary regime. The sandstone bodies are not strongly incised and have high aspect ratios. Previous interpretations of these intervening muddy intervals as overbank wedge/levee deposits, developed during a relative rise in sea level (Type 3) are considered inappropriate for the sections studied.

Key Words: turbidites • debris flows • foreland basins • transgressions • regressions




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