气候变化领域集成服务门户(CCPortal): Destructive episodes and morphological rejuvenation during the lifecycles of tectonically active seamounts: Insights from the Gorringe Bank in the NE Atlantic

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DOI	10.1016/j.epsl.2021.116772
	Destructive episodes and morphological rejuvenation during the lifecycles of tectonically active seamounts: Insights from the Gorringe Bank in the NE Atlantic
	Gamboa D.; Omira R.; Piedade A.; Terrinha P.; Roque C.; Zitellini N.
发表日期	2021
ISSN	0012821X
卷号	559
英文摘要	Seamounts are spectacular bathymetric features common within volcanic and tectonically active continental margins. During their lifecycles, they evolve through stages of construction and destruction. The latter are marked by variable magnitude flank collapses that often interrupt the evolution of seamounts and constitute a major source of hazard. The Southwest Iberian Margin is a tectonically complex region with moderate to high seismicity where numerous seamounts occur. On such a setting, earthquake-triggered collapses on seamount flanks are common, leading to the deposition of Mass-Transport Deposits (MTDs) on the surrounding abyssal plains. Using a wealth of 2D seismic reflection profiles, we investigate the lifecycle of the tectonic Gorringe Bank (GB), the largest submarine seamount offshore European margins, based on the magnitude and recurrence patterns of MTDs along the active thrust flank. Eight MTDs with relevant expression on the seismic data were analysed, four of estimated Miocene age and four on a Pliocene-Quaternary interval. Miocene MTDs are overall larger and correlate with the main uplift stages of the GB structure. Their distribution and relative timing suggest that failure-triggering earthquakes were common along the whole length of the GB. Pliocene to Quaternary MTDs tend to cluster along the northern half of the GB flank and are generally smaller. Overall, the size and magnitude of the mass-waste events is directly relatable to the magnitude of the uplift stages. Given the lack of indicators of large MTDs on the modern GB morphology, we propose that the lifecycle of tectonic seamounts is marked by morphological rejuvenation driven by thrust fault activity in between major collapse events or cycles. Tectonic-driven rejuvenation is thus key to hinder or obliterate evidence of past high-magnitude destructive events on tectonic seamount morphology. © 2021 Elsevier B.V.
关键词	evolutionary model Mass-Transport Deposits morphological rejuvenation seamount lifecycle tectonic seamounts
英文关键词	Bathymetry; Earthquakes; Endocrinology; Faulting; Morphology; Offshore oil well production; Seismic waves; Submarine geology; Abyssal plains; Bathymetric features; Continental margin; Flank collapse; Gorringe banks; Mass transport deposit; Relative timing; Whole lengths; Life cycle; continental margin; geomorphology; life cycle analysis; mass transport; seamount; seismic data; seismic reflection; seismicity; thrust fault; uplift; Atlantic Ocean; Gorringe Bank; Iberian Margin
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203095
作者单位	Instituto Português do Mar e de Atmosfera – IPMA, I.P., Rua C do Aeroporto, Lisbon, 1749-077, Portugal; Instituto D. Luiz – IDL, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Edifício C8, Piso 3, Lisbon, 1749-016, Portugal; Estrutura de Missão de Extensão da Plataforma Continental – EMEPC, Rua Costa Pinto, n. 165, Paço de Arcos2770-047, Portugal; Istituto di Scienze Marine (ISMAR), Via Gobetti 101, Bologna, 40129, Italy
推荐引用方式 GB/T 7714	Gamboa D.,Omira R.,Piedade A.,et al. Destructive episodes and morphological rejuvenation during the lifecycles of tectonically active seamounts: Insights from the Gorringe Bank in the NE Atlantic[J],2021,559.
APA	Gamboa D.,Omira R.,Piedade A.,Terrinha P.,Roque C.,&Zitellini N..(2021).Destructive episodes and morphological rejuvenation during the lifecycles of tectonically active seamounts: Insights from the Gorringe Bank in the NE Atlantic.Earth and Planetary Science Letters,559.
MLA	Gamboa D.,et al."Destructive episodes and morphological rejuvenation during the lifecycles of tectonically active seamounts: Insights from the Gorringe Bank in the NE Atlantic".Earth and Planetary Science Letters 559(2021).