Preliminary basin analysis of Late Proterozoic and Early Cambrian Brigham Group, southeastern Idaho

Conference · Fri Aug 01 00:00:00 EDT 1986 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:7042144

Link, P K; Jansen, S T

The Brigham Group in southeastern Idaho comprises over 3000 m (9843 ft) of dominantly quartzose sandy strata above the late Proterozoic Blackrock Canyon Limestone of the Pocatello Formation and below fossiliferous Cambrian carbonate. The Brigham was formerly thought of as a conformable sequence of quartzites deposited in the shallow marine Cordilleran miogeocline. Detailed study shows, however, that it contains braided fluvial, lacustrine, beach, intertidal and subtidal deposits; local and regional disconformities; and major influxes of coarse, angular feldspar. Braided-stream facies characterized by channels, discontinuous beds, gravel-size lag deposits, and poor sorting occur in the upper Caddy Canyon Quartzite, Mutual Formation, and lower Camelback Mountain Quartzite. Lacustrine facies of the Mutual Formation contain maroon and green laminated argillite with flaser-bedded sand. Both the Camelback Mountain and Caddy Canyon Quartzite contain low-angle wedge cross-beds of shoreface facies, tabular deposits of planar foreset beds belonging to the offshore sand-wave facies, and storm-produced hummocky cross-stratification. These two formations and the fine grained marine Inkom Formation contain submarine channels filled with coarse conglomerate. Tidal facies of the Papoose Creek Formation contain flaser beds, bimodal planar cross-beds, and synaeresis cracks. Feldspar is locally abundant (up to 40%). Its percentage varies both vertically within stratigraphic units and laterally in the same unit over tens of kilometers. It is absent only in the uppermost Camelback Mountain Quartzite at the top of the Brigham Group. Synsedimentary uplift of nearby basement source areas is suggested.

• Research Organization: Idaho State Univ., Pocatello
• OSTI ID: 7042144
• Report Number(s): CONF-8609129-
• Journal Information: Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 70:8; Conference: AAPG Rocky Mountain Section meeting, Casper, WY, USA, 7 Sep 1986
• Country of Publication: United States
• Language: English

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