期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 5, 页码 1465-1470出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL059176
关键词
Mid-Continent rift; continental extension; Laurentia; Amazonia; apparent polar wander path
资金
- NSF [EAR-1148088, EAR-0952345]
- Alexander von Humboldt Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1148088, 1147761] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1148027] Funding Source: National Science Foundation
The similar to 1.1Ga 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.
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