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GEOREF RECORD

Rapid evaluation of regional geometry and shortening of a fold-and-thrust belt; an example from the northeastern Brooks Range, Alaska

Catherine L. Hanks
Rapid evaluation of regional geometry and shortening of a fold-and-thrust belt; an example from the northeastern Brooks Range, Alaska
AAPG Bulletin (January 1993) 77 (1): 19-28

Abstract

Simple area-balanced models of a portion of the northeastern Brooks Range illustrate five regional constraints on the gross geometry of a foreland fold and-thrust belt. These factors include (1) the structural topography of the upper surface of the orogenic wedge, (2) the depth to the basal detachment surface at the pin line, (3) the dip of the basal detachment surface, (4) the presence of major ramps in the basal detachment surface, and (5) the depth at which the basal detachment horizon flattens (if it does). Area-balanced models incorporating variations in these factors can be quickly constructed and illustrate a range in the possible regional geometry and tectonic shortening for the fold-and-thrust belt. This method provides a rapid means of evaluating a variety of different geometries of the orogenic wedge before developing a more detailed balanced cross section. In the northeastern Brooks Range, the models alone suggest that the absolute range in possible shortening is from 24 to 69%, corresponding to a total tectonic shortening for the region of 40 to 280 km (24-171 mi).


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 77
Serial Issue: 1
Title: Rapid evaluation of regional geometry and shortening of a fold-and-thrust belt; an example from the northeastern Brooks Range, Alaska
Author(s): Hanks, Catherine L.
Affiliation: University of Alaska at Fairbanks, Geophysical Institute, Fairbanks, AK, United States
Pages: 19-28
Published: 199301
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 40
Accession Number: 1993-016125
Categories: Structural geologyEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch map
N66°00'00" - N69°40'00", W165°00'00" - W141°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1993
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