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Outcrop 12. Tres Pasos Formation Mass Transport Deposit Topography, Sierra Contreras

By
D.A. Armitage
D.A. Armitage
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B.W. Romans
B.W. Romans
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J.A. Covault
J.A. Covault
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S.A. Graham
S.A. Graham
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Published:
January 01, 2009

Abstract

Outcrop accessibility: difficult Outcrop Coordinates: 50.8859°S, 72.6545°W Refer to outcrop 12 on location map

At Sierra Contreras, deep-water slope depositional relationships between fine-grained mass transport deposits (MTDs) and overlying turbiditic sandstones can be assessed. The lateral continuity of sandstone-rich reservoir-scale bodies was dominantly controlled by original seafloor topography, related to the morphology of underlying MTDs. Overlying sandstone beds pinch-out and lap onto the relative topographic highs of the MTDs. Turbidite architecture evolves to more laterally continuous, sheet-like deposits as a result of depositional smoothing of MTD relief and diminished confinement (Shultz et al., 2005; Armitage et al., in press).

Small-scale MTD topography, characterized by several meters of vertical relief, was associated with local pockets of accommodation where sands were ponded. These small-scale surface irregularities are inferred to have been associated with the rugose tops of viscous MTDs. Meso-scale MTD topography (10 to several 10s of meters relief) was created by coherent rafted sandstone blocks resting on top of, or within the upper portion of MTD deposits; it is onlapped by overlying sandstone beds. This topography can laterally compartmentalize significant packages of sandstone. The largest scale of topography identified (several hundred meters horizontally and vertically) resulted from individual mass-wasting events (e.g., outsized block emplacement) creating topographic relief at the time of deposition. Topographic features at this scale can laterally divide large-scale sediment gravity flow pathways, leading to significant compartmentalization of sandstone bodies.

The size and abundance of rafted blocks in MTDs increases vertically in the outcrop suggesting

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Contents

SEPM Field Trip Guidebook

Stratigraphic Evolution of Deep-Water Architecture: Examples of controls and depositional styles from the Magallanes Basin, southern Chile

Andrea Fildani
Andrea Fildani
1.
Chevron Energy Technology Company, USA
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Stephen M. Hubbard
Stephen M. Hubbard
2.
Department of Geoscience, University of Calgary, Canada
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Brian W. Romans
Brian W. Romans
1.
Chevron Energy Technology Company, USA
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J.A. Covault
J.A. Covault
1.
Chevron Energy Technology Company, USA
3.
Department of Geological and Environmental Sciences, Stanford University, USA
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W.H. Crane
W.H. Crane
1.
Chevron Energy Technology Company, USA
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A. Bernhardt
A. Bernhardt
3.
Department of Geological and Environmental Sciences, Stanford University, USA
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Z.R. Jobe
Z.R. Jobe
3.
Department of Geological and Environmental Sciences, Stanford University, USA
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D.A. Armitage
D.A. Armitage
3.
Department of Geological and Environmental Sciences, Stanford University, USA
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J.C. Fosdick
J.C. Fosdick
3.
Department of Geological and Environmental Sciences, Stanford University, USA
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M.R. Shultz
M.R. Shultz
1.
Chevron Energy Technology Company, USA
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J. Clark
J. Clark
1.
Chevron Energy Technology Company, USA
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D.R. Lowe
D.R. Lowe
3.
Department of Geological and Environmental Sciences, Stanford University, USA
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S.A. Graham
S.A. Graham
3.
Department of Geological and Environmental Sciences, Stanford University, USA
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SEPM Society for Sedimentary Geology
Volume
10
ISBN electronic:
9781565762923
Publication date:
January 01, 2009

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