Numerical simulation of fibre growth in antitaxial strain fringes

Citation
D. Koehn et al., Numerical simulation of fibre growth in antitaxial strain fringes, J STRUC GEO, 22(9), 2000, pp. 1311-1324
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
JOURNAL OF STRUCTURAL GEOLOGY
ISSN journal
0191-8141 → ACNP
Volume
22
Issue
9
Year of publication
2000
Pages
1311 - 1324
Database
ISI
SICI code
0191-8141(200009)22:9<1311:NSOFGI>2.0.ZU;2-6
Abstract
A two-dimensional computer model ('Fringe Growth') is used to simulate the incremental growth of crystal fibres in undeformed antitaxial strain fringe s. The user can define the shape of a corp-object (e.g. a pyrite crystal), the growth velocity and anisotropy of growing crystals, the rotation of fri nges and core-object with respect to a horizontal datum and with respect to each other, and the opening velocity of fringes. Growth is simulated by mo vement of nodes connecting line segments that define the grain boundaries. Modelling results predict that face-controlled strain fringes will grow aro und smooth core-objects and strain fringes with displacement-controlled and face-controlled fibres around core-objects with rough surfaces. The surfac e roughness of the core-object determines if fibres in the fringes track th e opening trajectory, since fibres follow asperities on the surface of the core-object. Rotation of the core-object and the fringes with respect to an external reference frame and with respect to each other influences the geo metry of the fibres. Our modelling results indicate that fibre growth direc tion is not directly dependent on the orientation of the extensional instan taneous stretching axes or the finite maximum strain axes. (C) 2000 Elsevie r Science Ltd. All rights reserved.