气候变化领域集成服务门户(CCPortal): Intraplate deformation of oceanic crust near the Rio Grande Rise in the South Atlantic

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DOI	10.1016/j.tecto.2020.228543
	Intraplate deformation of oceanic crust near the Rio Grande Rise in the South Atlantic
	Estep J.; Reece R.; Kardell D.A.; Perez N.D.; Christeson G.L.; Carlson R.L.
发表日期	2020
ISSN	00401951
卷号	790
英文摘要	Globally, oceanic crust has relatively uniform thickness and structure compared to continental crust, with typical ocean crust being ~5–8 km thick. However, a substantial proportion of oceanic crust is thickened outside the normal range in the form of oceanic plateaus and crust affected by hotspots. The Rio Grande Rise (RGR) is the most prominent bathymetric feature in the western South Atlantic Ocean, and was thickened by activity of the Tristan hotspot. We use multichannel seismic data collected along the eastern margin of the RGR to investigate the relationship history between the thickened crust of the RGR and the adjacent normal crust. We find numerous normal faults spatially coincident with the region where oceanic crust begins to thicken from normal to RGR crust. Using crosscutting relationships and superposition, our interpretation supports protracted extensional deformation at the eastern margin of the RGR, including recent activity that appears to deform the modern seafloor. We attribute the faulting to differential subsidence linked to crustal thickness variations between the thickened RGR and ‘normal’ oceanic crust. Given the fundamental processes we attribute to the cause of faulting and the proportion of thickened oceanic crust globally, it is possible that regions of many oceanic plates experience intraplate deformation after formation. © 2020 Elsevier B.V.
关键词	Deformation of ocean crust Rio Grande Rise South Atlantic Ocean Subsidence of oceanic lithosphere Thickened ocean crust
英文关键词	Bathymetry; Deformation; Seismology; Structural geology; Bathymetric features; Continental crusts; Crustal thickness; Differential subsidence; Extensional deformation; Multi-channel seismic datum; Oceanic crust; South Atlantic; Fault slips; crustal structure; data interpretation; deformation; fault zone; hot spot; oceanic crust; spatial analysis; structural geology; Atlantic Ocean; Atlantic Ocean (South); Rio Grande Rise
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207747
作者单位	Department of Geology and Geophysics, Texas A&M University, College Station, TX, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States
推荐引用方式 GB/T 7714	Estep J.,Reece R.,Kardell D.A.,et al. Intraplate deformation of oceanic crust near the Rio Grande Rise in the South Atlantic[J],2020,790.
APA	Estep J.,Reece R.,Kardell D.A.,Perez N.D.,Christeson G.L.,&Carlson R.L..(2020).Intraplate deformation of oceanic crust near the Rio Grande Rise in the South Atlantic.Tectonophysics,790.
MLA	Estep J.,et al."Intraplate deformation of oceanic crust near the Rio Grande Rise in the South Atlantic".Tectonophysics 790(2020).