File(s) under permanent embargo
Ordovician cataclasite bands in the tambillo monzogranite: Expression of an early subphase of the ocloyic movements in the cordón Lila, northern Chile
journal contribution
posted on 2023-05-17, 21:01 authored by Palacios Herrera, MJ, Niemeyer, H, Sebastien MeffreSebastien MeffreTwo 'conjugate' systems of subvertical ordovician cataclastic bands of metric wide and whose strike are northeast and northwest are studied in the eastern border of Tambillo Monzogranite, also of Ordovician age. The northeastern system is the most conspicuous and its kinematic analysis shows sinistral displacement. The northwestern system is dextral and offsets the northeastern system. The two directions of bands form approximately right angle suggesting that they formed from joints after the Tambillo Monzogranite cooled. The spatial pattern of the cataclastic bands is fractal. It is suggested a north-south orientation for σ1. Cataclasis occurred during the Late Tremadocian and could attain the Darriwillian and it is assigned to an early subphase of the Ocloyic movements. A number of granodioritic dykes intruded along the bands that were weak zones used for their emplacement.
History
Publication title
Andean GeologyVolume
40Pagination
561-570ISSN
0718-7092Department/School
School of Natural SciencesPublisher
Servicio Nacional de Geologia y MineriaPlace of publication
Santiago, ChileRights statement
Copyright 2013 Andean GeologyRepository Status
- Restricted