Journal
GEOSPHERE
Volume 12, Issue 1, Pages 114-134Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/GES01233.1
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Funding
- Chile Slope Systems (CSS) joint industry project (Anadarko)
- Chile Slope Systems (CSS) joint industry project (BG Group)
- Chile Slope Systems (CSS) joint industry project (BHP Billiton)
- Chile Slope Systems (CSS) joint industry project (BP)
- Chile Slope Systems (CSS) joint industry project (Chevron)
- Chile Slope Systems (CSS) joint industry project (ConocoPhillips)
- Chile Slope Systems (CSS) joint industry project (Hess)
- Chile Slope Systems (CSS) joint industry project (Maersk)
- Chile Slope Systems (CSS) joint industry project (Marathon)
- Chile Slope Systems (CSS) joint industry project (Nexen)
- Chile Slope Systems (CSS) joint industry project (Shell)
- Chile Slope Systems (CSS) joint industry project (Statoil)
- Chile Slope Systems (CSS) joint industry project (Talisman Energy)
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The products of sediment-laden turbidity currents that traverse areas of decreasing confinement on submarine slopes include erosional and depositional features that record the inception and propagation of deep-sea channels. The cumulative stratigraphic expression and deposits of such transitions, however, are poorly constrained relative to depositional settings dominated by end-member confined (i.e., submarine channel fill) and unconfined (i.e., lobe) deposits. Upper Cretaceous strata of the Magallanes foreland basin in southern Chile are characterized by a variety of stratigraphic architectural elements in close juxtaposition both laterally and vertically, including: (1) low-aspect-ratio channelform bodies attributed to slope channel fills; (2) high-aspect-ratio channelform bodies interpreted as the deposits of weakly confined submarine channels; (3) lenticular sedimentary bodies considered to represent the infill of laterally coalesced scours; (4) discontinuous channelform bodies representing isolated scour fills; and (5) a cross-stratified, positive-relief sedimentary body, which is interpreted to record an upslope-migrating depositional bedform. These elements are interpreted to have formed at a submarine sediment routing system segment characterized by a break in slope, and an accompanying decrease in confinement. The various architectural elements examined are interpreted to record a unique stratigraphic perspective of turbidite channels at various stages of development, from early-stage discontinuous and isolated scour fills to low-aspect-ratio channel units.
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