On the use of regional joint sets as trajectories of paleostress fields during the development of the Appalachian plateau, New York.

T. Engelder, P. Geiser

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Abstract

To compare the orientation and development of jointing with the orientation and magnitude of finite strain recorded in the Upper Devonian rocks of the Appalachian plateau, New York, we mapped systematic joint sets on an area of 20,000 km2. In this area, Wedel(1932) mapped folds with limb dips of less than a degree and axes that change strike by 30o from 090o in the east to 060o in the west. We observed two different cross-strike joint sets that maintain their approximate cross-strike position from east to west. Yet, in detail the angle between the sets is 18o plus/minus 2o in the east and 30o plus/minus 4o in the west. In many outcrops one joint set parallels the direction of maximum compressive strain (episilonf) as recorded by deformed fossils, whereas the other joint set never parallels episilonf. Rare calcite-filled joints are oriented parallel to the direction of episilonf. In addition, the calcite-filled joints both cut and are cut by solution cleavage. These observations suggest that the joint set paralleling episilonf formed during the deformation event represented by the deformed fossils. The joint set that does not parallel episilonf somehow reflects a deformational event other than that producing fossil distortion, as suggested by strain relaxation experiments. -Authors Lamont- Doherty Geological Observatory of Columbia Univ., Palisades, New York 10964.

Original languageEnglish (US)
Pages (from-to)6319-6341
Number of pages23
JournalJournal of Geophysical Research
Volume85
Issue numberB11
DOIs
Publication statusPublished - Jan 1 1980

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All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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