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Conglomeratic Channels, Brockie Lake, Idaho, USA

By
T. H. Nilsen
T. H. Nilsen
1
Deceased
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G. S. Steffens
G. S. Steffens
2
Shell International Exploration and Production, Houston, Texas, USA
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B. E. Prather
B. E. Prather
2
Shell International Exploration and Production, Houston, Texas, USA
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Published:
January 01, 2008

Abstract

The Upper Mississippian Brockie Lake Conglomerate (BLC) of the Pioneer Mountains of south-central Idaho (Figure 1) forms a ~650-m (~2132-ft)-thick conglomeratic unit deposited in the Mississippian Antler foreland basin. It was derived from erosion of the Antler highlands to the west and was bounded by a cratonic carbonate platform to the east. Rapid rates of subsidence and sedimentation characterize the basin. The unit appears to form the lower lowstand portion of a second-order, technically driven sequence that grades upward into transgressive and highstand shoreface deposits of the overlying Iron Bog Creek Member. The BLC was originally interpreted as the proximal channelized part of a larger, coarse-grained, submarine-fan complex (Nilsen, 1977). More recent interpretations suggest that the upper part of the BLC may represent a deep-water fan-delta succession that accumulated during the late history of the foreland basin that was dominated by a second episode of flexural subsidence marked by structural segmentation of the basin (Link et al., 1996). The Brockie Lake Conglomerate Member is part of the Copper Basin Group. The Copper Basin Group is divided by Link et al. (1996) into three 1-20 m.y. sequences thought to have formed in response to tectonic effects. The lower two are of Early Mississippian age and the upper one is of Late Mississippian age. The upper sequence includes the BLC and Iron Bog Creek Members of the Argosy Creek Formation. This sequence is Meramecian and chesterian in age (20-30 m.y. duration), and consists of lowstand turbidites and fan-delta deposits of the BLC overlain by transgressive

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AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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