Decoupled extensional faulting and forced folding in the southern part of the Roer Valley Graben, Belgium
作者： Jef Deckers
DOI: 10.1016/J.JSG.2015.08.007
关键词: Graben 、 Extensional definition 、 Deformation (mechanics) 、 Paleontology 、 Geology 、 Monocline 、 Rift 、 Seismology 、 Paleogene 、 Evaporite
摘要: Abstract During late Oligocene incipient rifting, the southern part of Roer Valley Graben was characterized by normal faulting and forced folding its Paleogene pre-rift strata. The 2D seismic data used in this study shows that these faults folds were geometrically decoupled from or fault zones underlying Triassic older Geometric decoupling consistently took place an interval comprises (latest to Early Jurassic) soft claystones on top (Triassic) alternations evaporites layers. This mechanically weak probably inhibited upward propagation (re)activated faults, resulting formation observed (monoclines) overlying Strain sub-detachment distributed along towards detachment edges, leading consistent presence footwall domain supra-detachment monoclines. thereby able maintain kinematic coherency between under- deformation throughout rifting.
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