Early Neogene base-of-slope sediment at site 397, DSDP Leg 47a

sequential evolution of gravitative mass transport processes and redeposition along the northwest African passive margin.

M. A. Arthur, U. Von Rad

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Site 397 revealed a 1300m thick Neogene sediment wedge directly overlying strata on the upper continental rise off Cape Bojador. A major erosional event stripped sediment from the rise and slope, probably during Oligocene time and produced a hiatus of c.100 my. Slumping of slope sediment and cutting of submarine canyons commenced in M. Miocene. A thick sequence (554 m) of slump units, debris flow units, intercalated mud turbidites, and turbiditic sands accumulated on the upper continental rise. Slope gradients gradually decreased, and during early-late to M. Miocene c.200m of slumped hemipelagic marls and turbiditic sands intercalated with undisturbed hemipelagic marls were deposited. By early-late Miocene time, redeposition of sediment had ceased. -from Authors

Original languageEnglish (US)
Pages (from-to)603-637
Number of pages35
JournalUnknown Journal
StatePublished - Jan 1 1979

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redeposition
passive margin
Deep Sea Drilling Project
mass transport
transport process
Neogene
continental rise
Miocene
sediment
sand
submarine canyon
slumping
hiatus
debris flow
Oligocene
mud

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

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abstract = "Site 397 revealed a 1300m thick Neogene sediment wedge directly overlying strata on the upper continental rise off Cape Bojador. A major erosional event stripped sediment from the rise and slope, probably during Oligocene time and produced a hiatus of c.100 my. Slumping of slope sediment and cutting of submarine canyons commenced in M. Miocene. A thick sequence (554 m) of slump units, debris flow units, intercalated mud turbidites, and turbiditic sands accumulated on the upper continental rise. Slope gradients gradually decreased, and during early-late to M. Miocene c.200m of slumped hemipelagic marls and turbiditic sands intercalated with undisturbed hemipelagic marls were deposited. By early-late Miocene time, redeposition of sediment had ceased. -from Authors",
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T1 - Early Neogene base-of-slope sediment at site 397, DSDP Leg 47a

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AU - Arthur, M. A.

AU - Von Rad, U.

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Y1 - 1979/1/1

N2 - Site 397 revealed a 1300m thick Neogene sediment wedge directly overlying strata on the upper continental rise off Cape Bojador. A major erosional event stripped sediment from the rise and slope, probably during Oligocene time and produced a hiatus of c.100 my. Slumping of slope sediment and cutting of submarine canyons commenced in M. Miocene. A thick sequence (554 m) of slump units, debris flow units, intercalated mud turbidites, and turbiditic sands accumulated on the upper continental rise. Slope gradients gradually decreased, and during early-late to M. Miocene c.200m of slumped hemipelagic marls and turbiditic sands intercalated with undisturbed hemipelagic marls were deposited. By early-late Miocene time, redeposition of sediment had ceased. -from Authors

AB - Site 397 revealed a 1300m thick Neogene sediment wedge directly overlying strata on the upper continental rise off Cape Bojador. A major erosional event stripped sediment from the rise and slope, probably during Oligocene time and produced a hiatus of c.100 my. Slumping of slope sediment and cutting of submarine canyons commenced in M. Miocene. A thick sequence (554 m) of slump units, debris flow units, intercalated mud turbidites, and turbiditic sands accumulated on the upper continental rise. Slope gradients gradually decreased, and during early-late to M. Miocene c.200m of slumped hemipelagic marls and turbiditic sands intercalated with undisturbed hemipelagic marls were deposited. By early-late Miocene time, redeposition of sediment had ceased. -from Authors

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