DOI: 10.1016/j.earscirev.2019.102956
论文题名: Reykjanes Ridge evolution: Effects of plate kinematics, small-scale upper mantle convection and a regional mantle gradient
作者: Martinez F. ; Hey R. ; Höskuldsson Á.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 206 语种: 英语
中文关键词: Mantle gradient
; Mantle melting anomaly
; Ridge segmentation
; Ridge-hot spot interaction
; Slow-spreading ridges
; Small-scale mantle convection
; Transform faults
英文关键词: mantle convection
; mantle process
; melting
; plate boundary
; plate motion
; plate tectonics
; spreading center
; tectonic evolution
; tectonic setting
; triple junction
; upper mantle
; Atlantic Ocean
; Reykjanes Ridge
英文摘要: The Reykjanes Ridge is a key setting to study plate boundary processes overlaid on a regional mantle melting anomaly. The ridge originated as one arm of a ridge-ridge-ridge triple junction that separated Greenland, Eurasia, and North America. It initially formed a linear axis, spreading orthogonally at slow rates without transform faults or orthogonal crustal segmentation. Stable spreading continued in this configuration for ∼18 Myr until Labrador Sea spreading ceased, terminating the triple junction by joining Greenland to North America and causing a rapid ∼30° change in opening direction across the ridge. The ridge abruptly became segmented and offset by a series of transform faults that appear to decrease in length and spacing toward Iceland. Without further changes in opening direction, the ridge promptly began to reassemble its original linear configuration systematically and diachronously from north to south, even though this required the ridge to spread obliquely as it became linear again. Prominent V-shaped crustal ridges spread outward from the axis as the ridge became linear. This reconfiguration is presently nearly complete from Iceland to the Bight transform fault, a distance of nearly 1000 km. Both mantle plume and plate boundary processes have been proposed to control the tectonic reconfigurations and crustal accretion characteristics of the Reykjanes Ridge. Here we review the ridge characteristics and tectonic evolution and various models proposed to influence them. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166177
Appears in Collections: 气候变化与战略
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作者单位: Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822, United States; Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Sturlugata 7, Reykjavik, 101, Iceland
Recommended Citation:
Martinez F.,Hey R.,Höskuldsson Á.. Reykjanes Ridge evolution: Effects of plate kinematics, small-scale upper mantle convection and a regional mantle gradient[J]. Earth Science Reviews,2020-01-01,206