DOI: 10.1002/2013GL059176
论文题名: Was the Midcontinent Rift part of a successful seafloor-spreading episode?
作者: Stein C.A. ; Stein S. ; Merino M. ; Randy Keller G. ; Flesch L.M. ; Jurdy D.M.
刊名: Geophysical Research Letters
ISSN: 0094-10297
EISSN: 1944-10028
出版年: 2014
卷: 41, 期: 5 起始页码: 1465
结束页码: 1470
语种: 英语
英文关键词: Amazonia
; apparent polar wander path
; continental extension
; Laurentia
; Mid-Continent rift
Scopus关键词: Earth sciences
; Geophysics
; Amazonia
; apparent polar wander path
; continental extension
; Laurentia
; Mid-Continent rift
; Gallium
; craton
; extension
; gravity anomaly
; large igneous province
; magnetic anomaly
; rift zone
; rifting
; seafloor spreading
; volcanic rock
; volcanism
; Alabama
; Amazonia
; Canada
; Laurentian Mountains
; Quebec [Canada]
; United States
英文摘要: The ~1.1 Ga Midcontinent Rift (MCR), the 3000 km long largely buried feature causing the largest gravity and magnetic anomaly within the North American craton, is traditionally considered a failed rift formed by isolated midplate volcanism and extension. We propose instead that the MCR formed as part of the rifting of Amazonia (Precambrian northeast South America) from Laurentia (Precambrian North America) and became inactive once seafloor spreading was established. A cusp in Laurentia's apparent polar wander path near the onset of MCR volcanism, recorded by the MCR's volcanic rocks, likely reflects the rifting. This scenario is suggested by analogy with younger rifts elsewhere and consistent with the MCR's extension to northwest Alabama along the East Continent Gravity High, southern Appalachian rocks having Amazonian affinities, and recent identification of contemporaneous large igneous provinces in Amazonia. Key Points ~1.1Ga Mid-Continent Rift (MCR) formed during rifting of Amazonia from Laurentia MCR continues to northwest Alabama along East Continent Gravity High Apparent polar wander path's cusp reflects rifting event ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895189917&doi=10.1002%2f2013GL059176&partnerID=40&md5=944a9222bb20f4979b445e8dcd230e24
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7561
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago IL, United States
Recommended Citation:
Stein C.A.,Stein S.,Merino M.,et al. Was the Midcontinent Rift part of a successful seafloor-spreading episode?[J]. Geophysical Research Letters,2014-01-01,41(5).