Kinematics of fault-related folding in a duplex, lost river range, Idaho, U.S.A.

Christopher A. Hedlund, David J. Anastasio, Donald Myron Fisher

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The Doublespring duplex, located in the Lost River Range of Idaho, is a Sevier age fault-related fold complex in massive limestones of the Upper Mississippian Scott Peak Formation. Folds within the duplex closely resemble fault-bend fold geometrics, with open interlimb angles and low-angle bed cut-offs. Narrow, widely spaced, bedding-parallel shear zones with well-developed pressure solution cleavage alternate with massive, relatively undeformed layers on fold limbs. Shear zones are developed only on the limbs of anticlines, and have similar but unique morphologies in each of three different folds. Incremental strain histories reconstructed from antitaxial fibrous overgrowths and veins within the shear zones constrain the kinematics of folding. Shear zones experienced distributed bedding-parallel simple shear (flexural flow) towards pins near axial surfaces, while adjacent massive layers experienced rotation through an externally fixed extension direction. The absence of footwall synclines and morphological differences in shear zones from adjacent folds suggest that faulting preceded folding. Kinematic histories of folds that have experienced different translational histories are identical, and are not compatible with strain histories predicted from previous kinematic models of fault-bend folding. Shear zone development and fiber growth is instead interpreted to have occurred during low amplitude fixed-hinge buckling in response to initial resistance to translation of the thrust sheet. Fault-bend folding with mobile axial surfaces occurred with translation of the thrust sheets once the initial resistance to translation was overcome and resulted in no penetrative strain.

Original languageEnglish (US)
Pages (from-to)571-584
Number of pages14
JournalJournal of Structural Geology
Volume16
Issue number4
DOIs
StatePublished - Jan 1 1994

Fingerprint

duplex
folding
kinematics
shear zone
fold
river
history
limb
thrust
pressure solution
shear flow
buckling
syncline
footwall
anticline
cleavage
faulting
limestone

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

Hedlund, Christopher A. ; Anastasio, David J. ; Fisher, Donald Myron. / Kinematics of fault-related folding in a duplex, lost river range, Idaho, U.S.A. In: Journal of Structural Geology. 1994 ; Vol. 16, No. 4. pp. 571-584.
@article{7dca15c9bed24ab0826f6a2b0758725b,
title = "Kinematics of fault-related folding in a duplex, lost river range, Idaho, U.S.A.",
abstract = "The Doublespring duplex, located in the Lost River Range of Idaho, is a Sevier age fault-related fold complex in massive limestones of the Upper Mississippian Scott Peak Formation. Folds within the duplex closely resemble fault-bend fold geometrics, with open interlimb angles and low-angle bed cut-offs. Narrow, widely spaced, bedding-parallel shear zones with well-developed pressure solution cleavage alternate with massive, relatively undeformed layers on fold limbs. Shear zones are developed only on the limbs of anticlines, and have similar but unique morphologies in each of three different folds. Incremental strain histories reconstructed from antitaxial fibrous overgrowths and veins within the shear zones constrain the kinematics of folding. Shear zones experienced distributed bedding-parallel simple shear (flexural flow) towards pins near axial surfaces, while adjacent massive layers experienced rotation through an externally fixed extension direction. The absence of footwall synclines and morphological differences in shear zones from adjacent folds suggest that faulting preceded folding. Kinematic histories of folds that have experienced different translational histories are identical, and are not compatible with strain histories predicted from previous kinematic models of fault-bend folding. Shear zone development and fiber growth is instead interpreted to have occurred during low amplitude fixed-hinge buckling in response to initial resistance to translation of the thrust sheet. Fault-bend folding with mobile axial surfaces occurred with translation of the thrust sheets once the initial resistance to translation was overcome and resulted in no penetrative strain.",
author = "Hedlund, {Christopher A.} and Anastasio, {David J.} and Fisher, {Donald Myron}",
year = "1994",
month = "1",
day = "1",
doi = "10.1016/0191-8141(94)90098-1",
language = "English (US)",
volume = "16",
pages = "571--584",
journal = "Journal of Structural Geology",
issn = "0191-8141",
publisher = "Elsevier Limited",
number = "4",

}

Kinematics of fault-related folding in a duplex, lost river range, Idaho, U.S.A. / Hedlund, Christopher A.; Anastasio, David J.; Fisher, Donald Myron.

In: Journal of Structural Geology, Vol. 16, No. 4, 01.01.1994, p. 571-584.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kinematics of fault-related folding in a duplex, lost river range, Idaho, U.S.A.

AU - Hedlund, Christopher A.

AU - Anastasio, David J.

AU - Fisher, Donald Myron

PY - 1994/1/1

Y1 - 1994/1/1

N2 - The Doublespring duplex, located in the Lost River Range of Idaho, is a Sevier age fault-related fold complex in massive limestones of the Upper Mississippian Scott Peak Formation. Folds within the duplex closely resemble fault-bend fold geometrics, with open interlimb angles and low-angle bed cut-offs. Narrow, widely spaced, bedding-parallel shear zones with well-developed pressure solution cleavage alternate with massive, relatively undeformed layers on fold limbs. Shear zones are developed only on the limbs of anticlines, and have similar but unique morphologies in each of three different folds. Incremental strain histories reconstructed from antitaxial fibrous overgrowths and veins within the shear zones constrain the kinematics of folding. Shear zones experienced distributed bedding-parallel simple shear (flexural flow) towards pins near axial surfaces, while adjacent massive layers experienced rotation through an externally fixed extension direction. The absence of footwall synclines and morphological differences in shear zones from adjacent folds suggest that faulting preceded folding. Kinematic histories of folds that have experienced different translational histories are identical, and are not compatible with strain histories predicted from previous kinematic models of fault-bend folding. Shear zone development and fiber growth is instead interpreted to have occurred during low amplitude fixed-hinge buckling in response to initial resistance to translation of the thrust sheet. Fault-bend folding with mobile axial surfaces occurred with translation of the thrust sheets once the initial resistance to translation was overcome and resulted in no penetrative strain.

AB - The Doublespring duplex, located in the Lost River Range of Idaho, is a Sevier age fault-related fold complex in massive limestones of the Upper Mississippian Scott Peak Formation. Folds within the duplex closely resemble fault-bend fold geometrics, with open interlimb angles and low-angle bed cut-offs. Narrow, widely spaced, bedding-parallel shear zones with well-developed pressure solution cleavage alternate with massive, relatively undeformed layers on fold limbs. Shear zones are developed only on the limbs of anticlines, and have similar but unique morphologies in each of three different folds. Incremental strain histories reconstructed from antitaxial fibrous overgrowths and veins within the shear zones constrain the kinematics of folding. Shear zones experienced distributed bedding-parallel simple shear (flexural flow) towards pins near axial surfaces, while adjacent massive layers experienced rotation through an externally fixed extension direction. The absence of footwall synclines and morphological differences in shear zones from adjacent folds suggest that faulting preceded folding. Kinematic histories of folds that have experienced different translational histories are identical, and are not compatible with strain histories predicted from previous kinematic models of fault-bend folding. Shear zone development and fiber growth is instead interpreted to have occurred during low amplitude fixed-hinge buckling in response to initial resistance to translation of the thrust sheet. Fault-bend folding with mobile axial surfaces occurred with translation of the thrust sheets once the initial resistance to translation was overcome and resulted in no penetrative strain.

UR - http://www.scopus.com/inward/record.url?scp=0028184302&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028184302&partnerID=8YFLogxK

U2 - 10.1016/0191-8141(94)90098-1

DO - 10.1016/0191-8141(94)90098-1

M3 - Article

AN - SCOPUS:0028184302

VL - 16

SP - 571

EP - 584

JO - Journal of Structural Geology

JF - Journal of Structural Geology

SN - 0191-8141

IS - 4

ER -