Stratigraphic and structural framework of Ellesmerian and older sequences in Sadlerochit and Shublik Mountains, Arctic National Wildlife Refuge (ANWR), northeastern Alaska
- Alaska Division of Geological and Geophysical Surveys, Fairbanks (USA)
Detailed geological mapping (1:25,000 scale) and stratigraphic reconstructions in the Sadlerochit and Shublik Mountains of northeastern Alaska, immediately south of the ANWR coastal plain, indicate a compressive structural province dominated by major thrust-ramp-related anticlinal uplifts. The Katakturuk Dolomite, a Proterozoic sequence, has been subdivided into 15 lithostratigraphic units that can be traced the entire length of both the Sadlerochit and Shublik Mountains. Overlying the Katakturuk Dolomite in these ranges is the Middle Devonian to Cambrian or older Nanook Limestone. In the Early Mississippian a major erosional event produced the pre-Mississippian unconformity upon which a Mississippian through Triassic sequence was deposited: (A) Kayak Shale; (B) Lisburne Group carbonates; and (C) Sadlerochit Group clastic rocks. In the northern Sadlerochit Mountains, basal units of the Mississippian Alapah Limestone lie on the pre-Mississippian unconformity with no intervening Kayak Shale. The basal Alapah contains lithologies derived from the rocks units on which it rests, indicating that the contact between the Alapah and the underlying units is depositional. A regional decollement, localized along the pre-Mississippian unconformity in the Kayak Shale, is not a significant detachment surface north of the Shublik Mountains because the Kayak Shale is depositionally discontinuous and thin in the Sadlerochit Mountains.
- OSTI ID:
- 5720891
- Report Number(s):
- CONF-880301--
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (USA), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Vol. 72:2; ISSN AABUD; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
ALASKA
ALKALINE EARTH METAL COMPOUNDS
ANTICLINES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
DEPOSITION
DOLOMITE
FEDERAL REGION X
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
GEOLOGY
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MAPS
MESOZOIC ERA
MINERALS
MISSISSIPPIAN PERIOD
NORTH AMERICA
OXYGEN COMPOUNDS
ROCKS
SEDIMENTARY ROCKS
SHALES
STRATIGRAPHY
TRIASSIC PERIOD
USA