Structural style - Brooks Range Mountain Front, Alaska
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:6197660
The Brooks Range mountain front between the Sagavanirktok River and Kurupa Lake is characterized by thrust sheets of Lisburne rocks which dominantly have stratigraphic tops to the north and either dip northward or are overturned to the south. The early (Jurassic-Neocomian) thrust belt strikes obliquely (N70/sup 0/W) into the mountain front and can be traced on seismic sections into the foothills. Individual thrust structures die out westward into overturned folds and ultimately into plunging noses and the thrust belt plunges to the west and successively higher structural levels are exposed. The total thrust displacement remains essentially constant because of transfer of motion to higher thrusts. Most of the west plunge occurs along narrow zones of instant plunge with essentially zero plunge occurring along trend. The present east-west mountain front is oblique to the original thrust vergence (N20/sup 0/E) of Jurassic-Neocomian age and is due to later (Albian and younger) Brooks Range core uplift, folding, and comparatively minor thrusting. The Lisburne folds at the mountain front respond almost plastically to the late core uplift and gravitationally slide downward on rotated north-dipping thrust faults to form cascading folds with easiest relief upward and northward. Core uplift has rotated original thrust sheets 90/sup 0/ in some instances so that geologic map patterns are plunge-projection cross sections of thrust plates. The pattern at Eskimo Creek (Table Mountain quadrange, eastern Brooks Range) illustrates how a plunge view can reveal the true structure of the thrust belt.
- Research Organization:
- Chevron Overseas Petroleum Inc., San Francisco, CA
- OSTI ID:
- 6197660
- Report Number(s):
- CONF-8505215-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 69:4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Analysis of Laramide basement-involved deformation, Fra Cristobal Range, New Mexico
Folded Brookian thrust faults: Implications of three geologic/geophysical transects in the western Brooks Range, Alaska
THE INFLUENCE OF FOLD AND FRACTURE DEVELOPMENT ON RESERVOIR BEHAVIOR OF THE LISBURNE GROUP OF NORTHERN ALASKA
Conference
·
Fri Aug 01 00:00:00 EDT 1986
· Am. Assoc. Pet. Geol., Bull.; (United States)
·
OSTI ID:7230203
Folded Brookian thrust faults: Implications of three geologic/geophysical transects in the western Brooks Range, Alaska
Journal Article
·
Sun Jun 10 00:00:00 EDT 1990
· Journal of Geophysical Research; (United States)
·
OSTI ID:5014504
THE INFLUENCE OF FOLD AND FRACTURE DEVELOPMENT ON RESERVOIR BEHAVIOR OF THE LISBURNE GROUP OF NORTHERN ALASKA
Technical Report
·
Mon Dec 31 23:00:00 EST 2001
·
OSTI ID:835950