Deep-water facies of the Lisburne Group, west-central Brooks Range, Alaska

By: , and 
Edited by: Dennis K. Thurston and Kazuya Fujita

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Abstract

Deep-water lithofacies of the Lisburne Group (chiefly Carboniferous) occur in thurst sheets in the western part of the foreland fold-and-thrust belt of the Brooks Range and represent at least three discrete units. The Kuna Formation (Brooks Range allochthon) consists mostly of spiculitic mudstone and lesser shale; subordinate carbonate layers are chiefly diagenetic dolomite. The Akmalik Chert (Picnic Creek allochthon) is mostly radiolarian-spiculitic chert; rare limy beds are calcitized radiolarite. The Rim Butte unit (Ipnavik river allochthon) consists chiefly of calcareous turbidites, derived from shallow- and deep-water sources, interbedded with spiculitic mudstone. Much of the material in the turbidites came from a contemporaneous carbonate platform and margin, but some fossils and lithic clasts were eroded from older, already lithified carbonate-platform rocks. All three units appear to be roughly coeval in the Howard Pass area and are chiefly late Tournaisian and early Viséan (late Early Mississippian) in age.

Shallow-water lithofacies of the Lisburne Group exposed in the Howard Pass area (Brooks Range allochthon) are mostly of Viséan and younger (Late Mississippian) age. Thus, these carbonate-platform rocks were not the source of the calcareous turbidites in the Rim Butte unit. Rim Butte turbidites could have been derived from older carbonate-platform rocks such as the Utukok Formation of Tournaisian age (Kelly River allochthon) exposed mainly to the west of the Howard Pass quadrangle.

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Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Deep-water facies of the Lisburne Group, west-central Brooks Range, Alaska
Year Published 1992
Language English
Publisher Bureau of Ocean Energy Management
Publisher location Anchorage, AK
Contributing office(s) Alaska Science Center
Description 6 p.
Larger Work Title Proceedings: 1992 international conference on Arctic margins (MMS 94-0040)
First page 77
Last page 82
Conference Title 1992 International Conference on Arctic Margins (ICAM)
Conference Location Anchorage, AK
Conference Date September 2-3, 1992
Country United States
State Alaska
Other Geospatial Brooks Range
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