气候变化领域集成服务门户(CCPortal): Modes of Propagation of Continental Breakup and Associated Oblique Rift Structures

CCPortal

DOI	10.1029/2020JB019906
	Modes of Propagation of Continental Breakup and Associated Oblique Rift Structures
	Jourdon A.; Le Pourhiet L.; Mouthereau F.; May D.
发表日期	2020
ISSN	21699313
卷号	125 期号:9
英文摘要	V-shaped oceanic propagators are widespread around the world. Their geometry combined with magnetic anomalies associated with their opening shows at the first order that ridge propagation in the third dimension occurs by pulses. In this study we use 3D thermomechanical numerical models to show how oblique kinematic boundary conditions control both the intracontinental rift development and the oceanic ridge propagation. To do so, we apply a shortening velocity boundary condition in the direction perpendicular to the extension for “strong” and “weak” crustal rheologies. Numerical model results highlight the finding that three ridge propagation modes can occur. For low out-of-plane velocities (12% to 15% of the extension rate), the ridge propagation is fast (>1.5 cm year-1) and straight. Higher shortening velocities (15% to 17%) lead to a ridge propagation by pulses alternating between fast propagation (~1.5 cm year-1) and stalling phases. Finally, for higher velocities (17% to 20%) a ridge jump propagation mode occurs, localizing a new spreading center between 100 and 200 km far from the initial ridge. We also show that ridge propagation phases are associated with dip-slip-dominated deformation, while stalling phases are dominated by strike-slip deformation. These deformation regimes are marked by structure reorientation, while kinematic boundary conditions remain constant. We discuss these results in terms of plate tectonic reconstructions and regional geological studies. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	3D thermo-mechanical numerical modelling; Geodynamics; Oceanic propagators; Plate tectonics; Ridge propagation; Transform margins
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187614
作者单位	CNRS, GET, Université Paul Sabatier, Toulouse, France; Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP UMR, Paris, France; Department of Earth Sciences, Oxford University, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Jourdon A.,Le Pourhiet L.,Mouthereau F.,et al. Modes of Propagation of Continental Breakup and Associated Oblique Rift Structures[J],2020,125(9).
APA	Jourdon A.,Le Pourhiet L.,Mouthereau F.,&May D..(2020).Modes of Propagation of Continental Breakup and Associated Oblique Rift Structures.Journal of Geophysical Research: Solid Earth,125(9).
MLA	Jourdon A.,et al."Modes of Propagation of Continental Breakup and Associated Oblique Rift Structures".Journal of Geophysical Research: Solid Earth 125.9(2020).