Cleavage fronts and fans as reflections of orogen stress and kinematics in Taiwan

Donald M. Fisher, Sean Willet, Yeh En-Chao, M. Brooks Clark

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Recent observations of cleavage patterns, strain histories, and kinematics across the Taiwan mountain belt depict systematic orogen-scale variations with respect to the synorogenic divide and suggest that the pattern of cleavage development is a predictable consequence of orogen stresses and kinematics. In Taiwan, continental crust within the collision is accreted in the prowedge facing Asia, but is advected eastward into the east-verging retrowedge, where the most deeply exhumed rocks are exposed. Wedge mechanics predict a reversal in the direction of plunge of the principal compressive stress at the topographic divide between the opposing wedges. The observation of a single cleavage in western Taiwan suggests that the cleavage in the prowedge remains stable with respect to the stress orientation. In contrast, the existence of a second crenulation cleavage in the retrowedge is evidence for an abrupt change in stress orientation and unstable buckling of preexisting prowedge fabrics. Advection of a fabric across a topographic divide in a doubly vergent wedge provides an explanation for the occurrence of cleavage fronts and fans in natural systems such as Taiwan.

Original languageEnglish
Pages (from-to)65-68
Number of pages4
JournalGeology
Volume35
Issue number1
DOIs
Publication statusPublished - 2007 Jan 1

Fingerprint

cleavage
kinematics
crenulation cleavage
buckling
mechanics
continental crust
advection
collision
mountain
history
rock
fabric

Keywords

  • Cleavage fan
  • Cleavage front
  • Incremental strain
  • Slaty cleavage
  • Taiwan

ASJC Scopus subject areas

  • Geology

Cite this

Cleavage fronts and fans as reflections of orogen stress and kinematics in Taiwan. / Fisher, Donald M.; Willet, Sean; En-Chao, Yeh; Clark, M. Brooks.

In: Geology, Vol. 35, No. 1, 01.01.2007, p. 65-68.

Research output: Contribution to journalArticle

Fisher, Donald M. ; Willet, Sean ; En-Chao, Yeh ; Clark, M. Brooks. / Cleavage fronts and fans as reflections of orogen stress and kinematics in Taiwan. In: Geology. 2007 ; Vol. 35, No. 1. pp. 65-68.
@article{75eeed4b66ec4cac9d395e1ebfc99a2e,
title = "Cleavage fronts and fans as reflections of orogen stress and kinematics in Taiwan",
abstract = "Recent observations of cleavage patterns, strain histories, and kinematics across the Taiwan mountain belt depict systematic orogen-scale variations with respect to the synorogenic divide and suggest that the pattern of cleavage development is a predictable consequence of orogen stresses and kinematics. In Taiwan, continental crust within the collision is accreted in the prowedge facing Asia, but is advected eastward into the east-verging retrowedge, where the most deeply exhumed rocks are exposed. Wedge mechanics predict a reversal in the direction of plunge of the principal compressive stress at the topographic divide between the opposing wedges. The observation of a single cleavage in western Taiwan suggests that the cleavage in the prowedge remains stable with respect to the stress orientation. In contrast, the existence of a second crenulation cleavage in the retrowedge is evidence for an abrupt change in stress orientation and unstable buckling of preexisting prowedge fabrics. Advection of a fabric across a topographic divide in a doubly vergent wedge provides an explanation for the occurrence of cleavage fronts and fans in natural systems such as Taiwan.",
keywords = "Cleavage fan, Cleavage front, Incremental strain, Slaty cleavage, Taiwan",
author = "Fisher, {Donald M.} and Sean Willet and Yeh En-Chao and Clark, {M. Brooks}",
year = "2007",
month = "1",
day = "1",
doi = "10.1130/G22850A.1",
language = "English",
volume = "35",
pages = "65--68",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "1",

}

TY - JOUR

T1 - Cleavage fronts and fans as reflections of orogen stress and kinematics in Taiwan

AU - Fisher, Donald M.

AU - Willet, Sean

AU - En-Chao, Yeh

AU - Clark, M. Brooks

PY - 2007/1/1

Y1 - 2007/1/1

N2 - Recent observations of cleavage patterns, strain histories, and kinematics across the Taiwan mountain belt depict systematic orogen-scale variations with respect to the synorogenic divide and suggest that the pattern of cleavage development is a predictable consequence of orogen stresses and kinematics. In Taiwan, continental crust within the collision is accreted in the prowedge facing Asia, but is advected eastward into the east-verging retrowedge, where the most deeply exhumed rocks are exposed. Wedge mechanics predict a reversal in the direction of plunge of the principal compressive stress at the topographic divide between the opposing wedges. The observation of a single cleavage in western Taiwan suggests that the cleavage in the prowedge remains stable with respect to the stress orientation. In contrast, the existence of a second crenulation cleavage in the retrowedge is evidence for an abrupt change in stress orientation and unstable buckling of preexisting prowedge fabrics. Advection of a fabric across a topographic divide in a doubly vergent wedge provides an explanation for the occurrence of cleavage fronts and fans in natural systems such as Taiwan.

AB - Recent observations of cleavage patterns, strain histories, and kinematics across the Taiwan mountain belt depict systematic orogen-scale variations with respect to the synorogenic divide and suggest that the pattern of cleavage development is a predictable consequence of orogen stresses and kinematics. In Taiwan, continental crust within the collision is accreted in the prowedge facing Asia, but is advected eastward into the east-verging retrowedge, where the most deeply exhumed rocks are exposed. Wedge mechanics predict a reversal in the direction of plunge of the principal compressive stress at the topographic divide between the opposing wedges. The observation of a single cleavage in western Taiwan suggests that the cleavage in the prowedge remains stable with respect to the stress orientation. In contrast, the existence of a second crenulation cleavage in the retrowedge is evidence for an abrupt change in stress orientation and unstable buckling of preexisting prowedge fabrics. Advection of a fabric across a topographic divide in a doubly vergent wedge provides an explanation for the occurrence of cleavage fronts and fans in natural systems such as Taiwan.

KW - Cleavage fan

KW - Cleavage front

KW - Incremental strain

KW - Slaty cleavage

KW - Taiwan

UR - http://www.scopus.com/inward/record.url?scp=33846381375&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846381375&partnerID=8YFLogxK

U2 - 10.1130/G22850A.1

DO - 10.1130/G22850A.1

M3 - Article

AN - SCOPUS:33846381375

VL - 35

SP - 65

EP - 68

JO - Geology

JF - Geology

SN - 0091-7613

IS - 1

ER -