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DOI	10.1306/10261817077
	The influence of mechanically weak layers in controlling fault kinematics and graben configurations: Examples from analog experiments and the Norwegian continental margin
	Gabrielsen R.H.; Zalmstra H.; Sokoutis D.; Willingshofer E.; Faleide J.I.; Braut H.L.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:5
英文摘要	Fault systems in extensional basins commonly display geometries that vary with depth, reflecting depth- and lithology-dependent mechanical strength. Using an experimental approach, we investigate this relationship by deploying physical analog models with stratified sequences consisting of brittle–ductile (sand–silicone polymer) sequences subject to single and polyphase deformation. The experiments were used as analogs for a sandstone sequence interlayered by beds of evaporates or overpressured or unconsolidated mudstone in nature (the latter being representative of decollement horizons). Experiments (series 1 [S1]) using homogeneous and stratified quartz and feldspar sand produced asymmetric, composite single grabens with diverse fault frequencies and fault styles for the graben margin faults. For the mechanically stratified experiments with one decollement level (series 2), contrasting graben configurations were produced, in that the lowermost sequence was characterized by graben geometries of similar type to that of the S1 experiments, whereas the sequence above the decollement was characterized by large fault blocks, delineated by steepened or oversteepened faults. The experiments with two decollements (series 3) were displayed similarly but included graben geometries that widened upward, with each level being characterized by independent fault systems. The results can be used to explain strata-bound fault patterns and depth-dependent extension as seen in several places along the Norwegian continental margin and elsewhere. Copyright ©2019. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Feldspar; Lithology; Silicones; Continental margin; Depth dependents; Experimental approaches; Fault frequency; Fault kinematics; Fault patterns; Physical analog; Silicone polymers; Geometry; composite; continental margin; decollement; experimental design; fault; feldspar; graben; kinematics; mudstone; sandstone; Norway
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/125016
作者单位	Department of Geosciences, University of Oslo, Oslo, Norway; Faculty of Geosciences, Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Aker BP, Stavanger, Norway
推荐引用方式 GB/T 7714	Gabrielsen R.H.,Zalmstra H.,Sokoutis D.,et al. The influence of mechanically weak layers in controlling fault kinematics and graben configurations: Examples from analog experiments and the Norwegian continental margin[J],2019,103(5).
APA	Gabrielsen R.H.,Zalmstra H.,Sokoutis D.,Willingshofer E.,Faleide J.I.,&Braut H.L..(2019).The influence of mechanically weak layers in controlling fault kinematics and graben configurations: Examples from analog experiments and the Norwegian continental margin.AAPG Bulletin,103(5).
MLA	Gabrielsen R.H.,et al."The influence of mechanically weak layers in controlling fault kinematics and graben configurations: Examples from analog experiments and the Norwegian continental margin".AAPG Bulletin 103.5(2019).