DOI: 10.1002/2013GL058885
论文题名: Asthenospheric Pacific-Atlantic flow barriers and the West Scotia Ridge extinction
作者: Martos Y.M. ; Galindo-Zaldívar J. ; Catalán M. ; Bohoyo F. ; Maldonado A.
刊名: Geophysical Research Letters
ISSN: 0094-10526
EISSN: 1944-10257
出版年: 2014
卷: 41, 期: 1 起始页码: 43
结束页码: 49
语种: 英语
英文关键词: asthenospheric currents
; asthenospheric gateways
; Bouguer anomaly
; Drake Passage
; gravity modeling
Scopus关键词: Asthenospheric flow
; Bouguer anomaly
; Bouguer anomaly maps
; Drake passage
; Gravity model
; Gravity recovery and climate experiments
; Lithospheric structure
; Middle Miocene
; Earth sciences
; Geophysics
; Tectonics
; asthenosphere
; climate effect
; extension
; fracture zone
; lithospheric structure
; outflow
; plate tectonics
; satellite data
; Atlantic Ocean
; Scotia Ridge
英文摘要: The Drake Passage is considered a gateway for oceanic and asthenospheric flows since its opening, entailing widespread consequences for climate and plate tectonics, respectively. Both the surface and the 50 km upward continued Bouguer anomaly maps of the Scotia Sea and surrounding areas, based on Gravity Recovery and Climate Experiment gravity satellite data, improve our knowledge of deep lithospheric structures and the asthenosphere. We show that the West Scotia Sea is likely to be underlain by an anomalously low-density upper mantle. Gravity data are compatible with variable lithospheric thicknesses related to asthenospheric currents. The new data suggest that the development of the Shackleton Fracture Zone since the middle Miocene was probably a main factor that determined the evolution of the eastward Pacific mantle flows and the extinction of the West Scotia Sea oceanic spreading around 6 Ma ago. Deep lithospheric roots are likely to divert asthenospheric currents around them, flowing eastward through Drake Passage. Key Points Pacific mantle outflow is still present through the Drake Passage The Shackleton Fracture Zone modified asthenospheric flow patterns A redistribution of mantle flow may have caused West Scotia Ridge extinction ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896711823&doi=10.1002%2f2013GL058885&partnerID=40&md5=e5f8bc1c4f6c5cbf7a5a05dd6494307c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7790
Appears in Collections: 气候减缓与适应
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作者单位: Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas, Universidad de Granada, Ave. de Las Palmeras No. 4, ES-18100 Armilla, Granada, Spain
Recommended Citation:
Martos Y.M.,Galindo-Zaldívar J.,Catalán M.,et al. Asthenospheric Pacific-Atlantic flow barriers and the West Scotia Ridge extinction[J]. Geophysical Research Letters,2014-01-01,41(1).