气候变化领域集成服务门户(CCPortal): Relationship Between Lateral/Basal Shear Stress Ratio and Structural Vergence of Thrust Wedges: Results From Analogue Modeling and Implications for the Origin of Eastern Sichuan-Xuefeng Fold-Thrust Belt in South China

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DOI	10.1029/2021TC007035
	Relationship Between Lateral/Basal Shear Stress Ratio and Structural Vergence of Thrust Wedges: Results From Analogue Modeling and Implications for the Origin of Eastern Sichuan-Xuefeng Fold-Thrust Belt in South China
	Zhou, Chao; Zhou, Jianxun
通讯作者	Zhou, JX (通讯作者)
发表日期	2022
ISSN	0278-7407
EISSN	1944-9194
卷号	41 期号:3
英文摘要	Thrust wedges are common in nature, but not all of their origins can be properly explained by the classic Coulomb wedge theory, which considers only a 2D perspective. A few analogue models, however, revealed that lateral shear stress (inherent in both analogue models and nature) may strongly affect the development of thrust wedges and the lateral/basal shear stress (tau(s)/tau(d)) ratio might have controlled the structural vergence of thrust wedge, suggesting that origin of thrust wedges needs to be considered from a 3D perspective. The origin of the Eastern Sichuan-Xuefeng fold-thrust belt (ESXFTB), which is characterized by two oppositely vergent thrust systems at different crustal levels and may contain another large purely backward-vergent thrust wedge on the world, is still problematic. Revealing the relationship between tau(s)/tau(d) ratio and structural vergence may prompt a deep understanding of the origin of thrust wedges as well as the ESXFTB. This relationship, however, is still not very clear due to the lack of systematic experiments. For these reasons, we performed systematic experiments of two types of analogue models under different tau(s)/tau(d) ratios. Our model results revealed, for the first time, that structural vergence of thrust wedges lying on a weak decollement may progressively change from frontward (when tau(s)/tau(d) <0.09) to dual (when tau(s)/tau(d) = 0.09-1.15) and then to backward (when tau(s)/tau(d) >1.15) and the two oppositely vergent thrust systems in the ESXFTB can be produced simultaneously by the single northwestward Mesozoic shortening probably due to their apparently different tau(s)/tau(d) ratios.
关键词	CASCADIA SUBDUCTION ZONE ACCRETIONARY PRISM LANDWARD VERGENCE DEFORMATION EVOLUTION EXPERIMENTAL INSIGHTS OROGENIC WEDGES POTWAR PLATEAU SALT RANGE GEOMETRY DECOLLEMENT
英文关键词	thrust wedge; fold-thrust belt; structural vergence; analogue modeling; South China
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000776504200009
来源期刊	TECTONICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260559
推荐引用方式 GB/T 7714	Zhou, Chao,Zhou, Jianxun. Relationship Between Lateral/Basal Shear Stress Ratio and Structural Vergence of Thrust Wedges: Results From Analogue Modeling and Implications for the Origin of Eastern Sichuan-Xuefeng Fold-Thrust Belt in South China[J]. 中国科学院青藏高原研究所,2022,41(3).
APA	Zhou, Chao,&Zhou, Jianxun.(2022).Relationship Between Lateral/Basal Shear Stress Ratio and Structural Vergence of Thrust Wedges: Results From Analogue Modeling and Implications for the Origin of Eastern Sichuan-Xuefeng Fold-Thrust Belt in South China.TECTONICS,41(3).
MLA	Zhou, Chao,et al."Relationship Between Lateral/Basal Shear Stress Ratio and Structural Vergence of Thrust Wedges: Results From Analogue Modeling and Implications for the Origin of Eastern Sichuan-Xuefeng Fold-Thrust Belt in South China".TECTONICS 41.3(2022).