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- W1969093313 abstract "The boundaries of three plates, South America, Africa, and Antarctica, meet in a triple junction 250 km west of Bouvet Island. In the vicinity of the triple junction the most striking features of the Antarctica/South America and Africa/Antarctica plate boundaries are the Conrad and Bouvet fracture zones which trend N85°E and N45°E, respectively. We show by matching synthetic and observed magnetic anomaly profiles that the Antarctica/South America, Africa/Antarctica, and Africa/South America plates are moving apart at half rates of 0.90±0.1, 0.83±0.1, and 1.60±0.1 cm/yr, respectively. The rates and directions of motions for the Antarctica/South America and Africa/Antarctica plates are significantly different from those predicted by analysis of plate motions assuming global closure. The three plate boundaries meet within 10 km of 54°50′S, 00°40′W in a ridge-fault-fault (RFF) configuration. Within experimental error the relative velocity triangle closes. The triangle is isosceles, and the junction is stable. From the magnetic and topographic data we speculate that for the past 20 m.y. the triple junction has been located close to the junction of the Bouvet and Conrad fracture zones and has had a predominantly RFF configuration." @default.
- W1969093313 created "2016-06-24" @default.
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- W1969093313 date "1976-04-10" @default.
- W1969093313 modified "2023-10-09" @default.
- W1969093313 title "The Bouvet Triple Junction" @default.
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- W1969093313 doi "https://doi.org/10.1029/jb081i011p01857" @default.
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