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Title: Role of isostasy in the evolution of normal fault systems

The footwalls of west-dipping normal faults that separate the west-central Colorado Plateau from the Basin and Range province record at least 5-7 km, and perhaps as much as 15-20 km, of west-side-up Neogene uplift, with an axis just 10-20 km west of undeformed plateau strata. The uplift is expressed as folding and steep faulting in pre-Tertiary cratonic and disconformably overlying Neogene strata, forming a basement-cored anticline and coincident topographic high on the western margin of the plateau. The authors interpret the uplift as a nonelastic response of the crust to buoyancy forces accompanying the tectonic denudation of the plateau margin. Profound, isostatically driven deformation of the footwalls of major normal faults may be common in extensional terrains, calling into question several assumptions fundamental to existing models of the evolution of normal fault systems.
Authors:
;
Publication Date:
OSTI Identifier:
6765075
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geology; (United States); Journal Volume: 16:9
Research Org:
Harvard Univ., Cambridge, MA (USA)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; GEOLOGIC FAULTS; GEOLOGIC MODELS; COLORADO; DEFORMATION; GEOLOGIC HISTORY; GROUND UPLIFT; ORIGIN; STRATA MOVEMENT; FEDERAL REGION VIII; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; NORTH AMERICA; USA 580100* -- Geology & Hydrology-- (-1989)