气候变化领域集成服务门户(CCPortal): Cretaceous ocean formation in the High Arctic

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DOI	10.1016/j.epsl.2020.116552
	Cretaceous ocean formation in the High Arctic
	Døssing A.; Gaina C.; Jackson H.R.; Andersen O.B.
发表日期	2020
ISSN	0012821X
卷号	551
英文摘要	Understanding the evolution of ocean basins is critical for studies in global plate tectonics, mantle dynamics, and sea-level through time, and relies on identifiable tectonic plate boundaries. The evolution of the 2.5 million km2 Amerasia Basin in the Arctic Ocean remains largely unsettled due to widespread overprint by the Cretaceous High-Arctic Large Igneous Province. Traces of an extinct, but deeply buried, spreading centre (herein South Amerasia Ridge, SAR) has been shown to exist in the southern part of the Amerasia Basin, in the Canada Basin. However, structural details of the SAR and, hence, the kinematic evolution of the Canada Basin, are yet to be unraveled. Based on 3D gravity inversion and the vertical gravity gradient of the latest generation of satellite gravity models, we document new structures within the Canada Basin spreading system. Our results are supported by analysis of aeromagnetic and recent marine geophysical data. Evidence is shown of consistent oblique segmentation of the SAR spreading centre in a right stepping en echelon pattern. The spreading segments are offset by northeast-trending non-transforms that are traceable throughout the oceanic crustal domain and parallel to pre-oceanic strike-slip faults in the older part of the Canada Basin. We interpret the SAR to have formed by highly oblique spreading in a northeast-southwest direction. We compare the predicted SAR basement topography with the global ridge systems and produce a detailed magnetic modelling also constrained by the basement topography. The results indicate that the SAR crust formed by a slow-to-intermediate spreading regime and that sea-floor spreading terminated during a reverse polarity chron, most likely in the Early Cretaceous. Our novel plate reconstruction model, adopting a highly oblique spreading in Canada Basin, requires a translational motion of the Alaska/Chukotka tectonic block, replacing the decades-old rotational model of the Cretaceous High Arctic. © 2020 Elsevier B.V.
关键词	Amerasia Basin Canada Basin cretaceous gravity inversion plate reconstructions sea-floor spreading
英文关键词	Buildings; Planetary surface analysis; Sea level; Strike-slip faults; Topography; Transform faults; High-arctic large igneous provinces; Kinematic evolution; Oblique segmentations; Plate reconstruction; Rotational models; Seafloor spreading; Structural details; Translational motions; Plates (structural components); basin evolution; Cretaceous; gravity field; kinematics; paleoceanography; plate tectonics; seafloor spreading; tectonic reconstruction; Amerasian Basin; Arctic Ocean; Canada Basin
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/202566
作者单位	CMAGTRES, DTU Space, Centrifugevej 356, Lyngby, 2800, Denmark; Centre for Earth Evolution and Dynamics, University of Oslo, Norway; Geological Survey of Canada Atlantic, Dartmouth, NS, Canada; DTU Space, Elektrovej 328, Lyngby, 2800, Denmark
推荐引用方式 GB/T 7714	Døssing A.,Gaina C.,Jackson H.R.,et al. Cretaceous ocean formation in the High Arctic[J],2020,551.
APA	Døssing A.,Gaina C.,Jackson H.R.,&Andersen O.B..(2020).Cretaceous ocean formation in the High Arctic.Earth and Planetary Science Letters,551.
MLA	Døssing A.,et al."Cretaceous ocean formation in the High Arctic".Earth and Planetary Science Letters 551(2020).