TY  - JOUR
A1  - Cheng, Chao
A1  - Zulauf, Janet
A1  - Zulauf, Gernold
A1  - Hattingen, Elke
T1  - Boudinage and folding of oblique single layers in bulk constrictional strain fields: Results from analogue modelling
T2  - Journal of structural geology
N2  - Highlights
• Constrictional structures range from dome-and-basin folds to coeval folds and boudins.
• Under bulk constriction, the competent layer rotates slower than a passive plane.
• Extension-parallel and –perpendicular folds grow simultaneously.
• Extension-perpendicular folds affect previous boudins.
Abstract
We conducted scaled analogue modelling to show the influence of varying single layer initial orientation on the geometry of folds and boudins in a bulk constrictional strain field. The initial angle between the plane of shortening and the competent layer (θZ(i)) was incrementally increased from 0° to 90° by multiples of 11.25°. While the amount of layer thickening decreased with increasing θZ(i), the deformation structures produced range from pure dome-and-basin folds to coeval folds and boudins. Based on the attitude of fold axes, there are extension-parallel (FEPR) and extension-perpendicular (FEPP) folds, with axes subparallel and subperpendicular to the principal stretching axis (X), respectively. Coeval growth of FEPR folds and boudins occurred when θZ(i) > ca. 25°. The FEPP folds can be subdivided into a first type which affect the entire layer (if θZ(i) ranges between 11.25 and 78.75°) and a second type, referred to as FBEPP folds, which are affecting pre-existing boudins if θZ(i) > 45°. The interlimb angle of all types of folds increases with increasing θZ(i). Folds and boudins similar to the ones produced in this study can be found in salt domes and in tectonites of subduction zones.
KW  - Coeval folding and boudinage
KW  - Non-cylindrical folds
KW  - Dome-and-basin structure
KW  - Constriction
KW  - Deformation oblique layer
KW  - Analogue modelling
Y1  - 2024
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/85640
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-856404
SN  - 0191-8141
VL  - 184
IS  - art. 105153
PB  - Elsevier
CY  - Amsterdam
ER  -