TY - JOUR
T1 - Regional shortening fabrics in eastern North America
T2 - Far‐field stress transmission from the Appalachian‐Ouachita Orogenic Belt
AU - Craddock, John P.
AU - Jackson, Mike
AU - van der Pluijm, Ben A.
AU - Versical, Robert T.
N1 - Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 1993/2
Y1 - 1993/2
N2 - Paleozoic carbonates of cratonic eastern North America comprise the footwall of the Appalachian‐Ouachita fold‐and‐thrust belt and contain a layer‐parallel shortening (lps) fabric that is preserved by mechanically twinned calcite. Shortening directions are generally parallel to the Appalachian‐Ouachita thrust‐transport direction in carbonates of the thrust belt proper (restored width ∼400 km) and within carbonates up to 1700 km into the foreland, giving a pre‐thrusting sedimentary prism ∼2100 km wide through which compressive orogenic stresses were transmitted. The shortening strain magnitudes (<6%) and the inferred calcite twinning differential stress magnitudes (<90 MPa) decrease exponentially away from the orogenic front. Calcite twinning strain patterns in other adjacent tectonic provinces, such as the Grenville, Laramide, Keweenawan Rift, and Newark Basin, are distinct from the twinning strains preserved in the cratonic Paleozoic carbonates. (Appalachian orogen, far‐field stresses, calcite microstructures).
AB - Paleozoic carbonates of cratonic eastern North America comprise the footwall of the Appalachian‐Ouachita fold‐and‐thrust belt and contain a layer‐parallel shortening (lps) fabric that is preserved by mechanically twinned calcite. Shortening directions are generally parallel to the Appalachian‐Ouachita thrust‐transport direction in carbonates of the thrust belt proper (restored width ∼400 km) and within carbonates up to 1700 km into the foreland, giving a pre‐thrusting sedimentary prism ∼2100 km wide through which compressive orogenic stresses were transmitted. The shortening strain magnitudes (<6%) and the inferred calcite twinning differential stress magnitudes (<90 MPa) decrease exponentially away from the orogenic front. Calcite twinning strain patterns in other adjacent tectonic provinces, such as the Grenville, Laramide, Keweenawan Rift, and Newark Basin, are distinct from the twinning strains preserved in the cratonic Paleozoic carbonates. (Appalachian orogen, far‐field stresses, calcite microstructures).
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U2 - 10.1029/92TC01106
DO - 10.1029/92TC01106
M3 - Article
AN - SCOPUS:0027455877
VL - 12
SP - 257
EP - 264
JO - Tectonics
JF - Tectonics
SN - 0278-7407
IS - 1
ER -