Using along-strike variation in strain and kinematics to define the movement direction of curved transpressional shear zones: An example from northwestern Superior Province, Manitoba

Authors
Citation
Sf. Lin et Dz. Jiang, Using along-strike variation in strain and kinematics to define the movement direction of curved transpressional shear zones: An example from northwestern Superior Province, Manitoba, GEOLOGY, 29(9), 2001, pp. 767-770
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGY
ISSN journal
0091-7613 → ACNP
Volume
29
Issue
9
Year of publication
2001
Pages
767 - 770
Database
ISI
SICI code
0091-7613(200109)29:9<767:UAVISA>2.0.ZU;2-P
Abstract
A review of current understanding of structures in shear zones reveals that correlating the orientation of stretching lineations with movement directi on, once a common practice based on the simple shear model, is not generall y applicable to transpressional. zones. It is difficult to determine the mo vement direction of a transpressional zone based on internal structures. We show that the movement direction can be better defined by considering the variation in strain geometry and kinematics of differently oriented and kin ematically related shear zones or different segments of a curved shear zone . Application of this method to a shear zone in the northwestern Superior P rovince of Manitoba shows that the movement direction there is approximatel y north-south, in contrast to a commonly held view for similarly oriented s hear zones in the Superior Province that the movement direction is approxim ately east-west.