期刊
JOURNAL OF STRUCTURAL GEOLOGY
卷 29, 期 9, 页码 1422-1429出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsg.2007.06.008
关键词
flexural-slip folding; layer-parallel faulting; ramps; duplexes; bushveld complex
This paper investigates structures in the layered Critical Zone of the Bushveld Complex in South Africa that have detrimentally affected mining operations. The common structures are layer-parallel faults with reverse dip-slip and ramp faults with curved slip planes and prominent striations. Geometric variations include duplex ramps contained within floor and roof layer-parallel faults and linking ramps connecting separate layer-parallel faults hidden in the footwall and hangingwall. The orientations, geometries, displacements and shear senses of the layer-parallel faults and ramp faults are interpreted to be flexural-slip structures formed during bending of the originally horizontal Bushveld Complex into a basin-fold geometry during crustal loading. (c) 2007 Elsevier Ltd. All rights reserved.
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