DOI: 10.1016/j.earscirev.2019.04.011
论文题名: Crustal fragmentation, magmatism, and the diachronous opening of the Norwegian-Greenland Sea
作者: Gernigon L. ; Franke D. ; Geoffroy L. ; Schiffer C. ; Foulger G.R. ; Stoker M.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 206 语种: 英语
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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166087
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Gernigon L.,Franke D.,Geoffroy L.,et al. Crustal fragmentation, magmatism, and the diachronous opening of the Norwegian-Greenland Sea[J]. Earth Science Reviews,2020-01-01,206