Journal
JOURNAL OF STRUCTURAL GEOLOGY
Volume 31, Issue 9, Pages 1028-1038Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsg.2009.03.010
Keywords
Tectonic fabrics; Anisotropy of magnetic susceptibility; AMS; Fry strain analysis; Appalachian fold-thrust belt; Hudson Valley fold-thrust belt; Rosendale; Lackawanna synclinorium
Categories
Funding
- USGS EDMAP program
- Geological Society of America
- Sigma Xi
- Department of Geology at the University of Illinois
- Division Of Earth Sciences
- Directorate For Geosciences [0732473] Funding Source: National Science Foundation
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In moderately to highly strained sandstones, both the long axis of the bedding-parallel finite-strain ellipse, as calculated by the normalized Fry method, and the projection of the long axis of the AMS ellipsoid on the plane of bedding, align well with local structural grain (trends of cleavage, folds, and faults). This relationship implies that results of both 2D Fry and AMS analyses represent the local layer-parallel tectonic strain component. Do both methods provide comparable results for very low-strain sandstone (e.g., 95%)? To address this question, Fry and AMS analyses were conducted in very low-strain sandstone from two localities in the Appalachian foreland fold thrust belt: near Rosendale in New York and the Lackawanna synclinorium of Pennsylvania. We compared the map projections of both bedding-parallel Fry ellipses and AMS ellipsoids to the local structural grain. In both study areas, projections of the long axis of Fry strain ellipses do not cluster in a direction parallel to structural grain, whereas the projection of the long axes of AMS ellipsoids do cluster closely to structural grain. This observation implies that in very low-strain sandstone, AMS analysis provides a more sensitive quick indicator of tectonic fabric than does normalized Fry analysis. (C) 2009 Elsevier Ltd. All rights reserved.
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