The Phoenix lineations are a set of east-west trending magnetic anomalies that recorded sea-floor spreading in the Nauru and Central Pacific Basins of the western Pacific from the Late Jurassic through the Early Cretaceous. The northern portions of these basins near the Marshall-Gilbert Islands are characterized by a magnetic quiet zone that presumably formed in the Late Jurassic prior to M25 (153 m.y.). In the eastern part of the Central Pacific Basin just east of Magellan Rise is a northwest trending M 11(126 m.y.) to M4 (117 m.y. anomaly sequence. The geometry and spreading rates associated with the east-west trending Phoenix lineations and the Hawaiian lineations to the north suggest that the two patterns met at a fault-fault-ridge triple junction from M25 (153 m.y.) until M14 (131 m.y.) time. This system underwent a readjustment between M14 and M 10 time that transferred the Magellan Rise from the Phoenix plate to the Pacific plate and established two triple junctions in place of the previous one. A stable fault-fault-ridge junction formed just southeast of Magellan Rise to connect the east-west and northwest trending Phoenix lineations, while a slow-spreading, ridge-ridge-ridge junction broke the original Pacific plate in two from at least Ml 1 to M4 time and was responsible for the formation of the Mid-Pacific Mountains.
[1]
Roger L. Larson,et al.
A revised time scale of magnetic reversals for the Early Cretaceous and Late Jurassic
,
1975
.
[2]
M. Tharp,et al.
Cretaceous Drowning of Reefs on Mid-Pacific and Japanese Guyots
,
1974,
Science.
[3]
R. Detrick,et al.
Elevation of Midocean Ridges and the Basement Age of JOIDES Deep Sea Drilling Sites
,
1973
.
[4]
W. C. Pitman,et al.
World-Wide Correlation of Mesozoic Magnetic Anomalies, and Its Implications
,
1972
.
[5]
R. Larson,et al.
Late Mesozoic Evolution of the Western Pacific Ocean
,
1972
.
[6]
Stuart M. Smith,et al.
Magnetic lineations of early Cretaceous age in the western equatorial Pacific Ocean
,
1972
.
[7]
W. Normark,et al.
Sedimentation and Erosion on Horizon Guyot
,
1972
.
[8]
D. McKenzie,et al.
Evolution of Triple Junctions
,
1969,
Nature.