气候变化领域集成服务门户(CCPortal): Crustal fragmentation, magmatism, and the diachronous opening of the Norwegian-Greenland Sea

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DOI	10.1016/j.earscirev.2019.04.011
	Crustal fragmentation, magmatism, and the diachronous opening of the Norwegian-Greenland Sea
	Gernigon L.; Franke D.; Geoffroy L.; Schiffer C.; Foulger G.R.; Stoker M.
发表日期	2020
ISSN	00128252
卷号	206
英文摘要	The Norwegian-Greenland Sea (NGS) in the NE Atlantic comprises diverse tectonic regimes and structural features including sub-oceanic basins of different ages, microcontinents and conjugate volcanic passive margins, between the Greenland-Iceland-Faroe Ridge in the south and the Arctic Ocean in the north. We summarize the tectonic evolution of the area and highlight the complexity of the conjugate volcanic and rifted margins up to lithospheric rupture in the NGS. The highly magmatic breakup in the NGS was diachronous and initiated as isolated and segmented seafloor spreading centres. The early seafloor spreading system, initiating in the Early Eocene, gradually developed into atypical propagating systems with subsequent breakup(s) following a step-by-step thinning and rupture of the lithosphere. Newly-formed spreading axes propagated initially towards local Euler poles, died out, migrated or jumped laterally, changed their propagating orientation or eventually bifurcated. With the Palaeocene onset of volcanic rifting, breakup-related intrusions may have localized deformation and guided the final axis of breakup along distal regions already affected by pre-magmatic Late Cretaceous-Palaeocene and older extensional phases. The final line of lithospheric breakup may have been controlled by highly oblique extension, associated plate shearing and/or melt intrusions before and during Seaward Dipping Reflectors (SDRs) formation. The Inner SDRs and accompanying volcanics formed preferentially either on thick continental ribbons and/or moderately thinned continental crust. The segmented and diachronic evolution of the NGS spreading activity is also reflected by a time delay of 1–2 Myrs expected between the emplacement of the SDRs imaged at the Møre and Vøring margins. This complex evolution was followed by several prominent changes in spreading kinematics, the first occurring in the Middle Eocene at 47 Ma–magnetic chron C21r. Inheritance and magmatism likely influenced the complex rift reorganization resulting in the final dislocation of the Jan Mayen Microplate Complex from Greenland, in the Late Oligocene/Early Miocene. © 2020 The Authors
英文关键词	fragmentation; magmatism; oceanic crust; oceanic lithosphere; passive margin; rift zone; tectonic evolution; tectonic setting; Arctic Ocean; Arctic Ocean; Atlantic Ocean; Greenland Sea; Iceland-Faroe Ridge; Norwegian Sea
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203718
作者单位	Geological Survey of Norway (NGU), Trondheim, Norway; Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany; Institut Universitaire Européen de la Mer (IUEM), Plouzané, France; Uppsala University, Uppsala, Sweden; Dept. Earth Sciences, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, United Kingdom; Australian School of Petroleum, University of Adelaide, Adelaide, SA 5005, Australia
推荐引用方式 GB/T 7714	Gernigon L.,Franke D.,Geoffroy L.,et al. Crustal fragmentation, magmatism, and the diachronous opening of the Norwegian-Greenland Sea[J],2020,206.
APA	Gernigon L.,Franke D.,Geoffroy L.,Schiffer C.,Foulger G.R.,&Stoker M..(2020).Crustal fragmentation, magmatism, and the diachronous opening of the Norwegian-Greenland Sea.Earth Science Reviews,206.
MLA	Gernigon L.,et al."Crustal fragmentation, magmatism, and the diachronous opening of the Norwegian-Greenland Sea".Earth Science Reviews 206(2020).