Authors
Derald G Smith, Stephen M Hubbard, Dale A Leckie, Milovan Fustic
Publication date
2009/10
Journal
Sedimentology
Volume
56
Issue
6
Pages
1655-1669
Publisher
Blackwell Publishing Ltd
Description
Counter point bar deposits in the meandering Peace River, North‐central Alberta, Wood Buffalo National Park, are distinct from point bar deposits in terms of morphology, lithofacies and reservoir potential for fluids. Previously referred to as the distal‐most parts of point bars, point bar tails and concave bank‐bench deposits, counter point bar deposits have concave morphological scroll patterns rather than convex as with point bars. The Peace is a large river (bankfull discharge 11 700 m3 sec−1, width 375 to 700 m, depth 15 m, gradient 0·00004 or 4 cm km−1) in which counter point bar deposits are dominated by silt (80% to 90%), which contrasts with sand‐dominant (90% to 100%) point bar deposits. Beginning at the meander inflection (transition from convex to concave), counter point bar deposit stratigraphy thickens as a wedge‐like architecture in the distal direction until the deposit is nearly as thick as …
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