Aeromagnetic study of the Mid-Atlantic Ridge near the Oceanographer Fracture Zone

Phillips, J. D.; Fleming, Henry S.; Feden, Robert H.; King, William E.; Perry, R. K.

doi:10.1130/0016-7606(1975)86<1348:asotmr>2.0.co;2

Cited by 20 publications

(5 citation statements)

References 13 publications

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“…[10] In order to keep as best as possible the original magnetic information, no analytical continuation to a single reference height was applied. This means that data from the Azores aeromagnetic survey are referred to an altitude of 700 m [Luis, 1996], Phillips et al [1975] surveys to 1000 m, and the surface ship magnetic data to the geoid.…”

Section: Magnetic Data Collationmentioning

confidence: 99%

“…Very dense distribution corresponds to the Portuguese aeromagnetic survey. Other data are originated from the Woods Hole aeromagnetic surveys [Phillips et al, 1975] and several magnetic surveys done during MAR missions as well as new magnetic data compiled from the National Geophysical Data Center database.…”

Section: Continuous Reduction To the Polementioning

confidence: 99%

“…For the whole area the Verhoef et al [1996] compilation is available but its quality is dependent on the resolution and accuracy of the surveys upon which it was prepared, being rather good in areas where it relies on dense and accurate surveys, usually close to the shelf, and not so good in deep oceanic areas where data are scarce. Close to the Azores Triple Junction there are additional sources of magnetic data: the aeromagnetic survey made between 1984 and 1993 by the Portuguese Meteorological Institute [Luis, 1996]; three aeromagnetic surveys carried out by Woods Hole Oceanographic Institute [Phillips et al, 1975] north and south of the triple junction; small magnetic surveys done during Mid-Atlantic Ridge (MAR) missions [e.g., Goslin et al, 1999]. These additional surveys provide a large amount of good quality magnetic data, which can largely enhance our ability to identify magnetic isochrones, particular along the Azores plateau.…”

Section: Magnetic Data Collationmentioning

confidence: 99%

“…This means that data from the Azores aeromagnetic survey are referred to an altitude of 700 m [Luis, 1996], Phillips et al [1975] surveys to 1000 m, and the surface ship magnetic data to the geoid.…”

Section: Magnetic Data Collationmentioning

confidence: 99%

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Reevaluation of magnetic chrons in the North Atlantic between 35°N and 47°N: Implications for the formation of the Azores Triple Junction and associated plateau

Luís¹,

Miranda²

2008

J. Geophys. Res.

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[1] In this paper we present a new magnetic compilation for an area of the North Atlantic located between 35°N and 47°N and up to anomaly 33r. We also present a strategy to pick magnetic isochrones and compute finite rotation poles. This technique is based on a continuous reduction to the pole technique and some basic assumptions regarding the direction of the remanent magnetization vector. A cost function that measures the misfit between interpreted and rotated isochrones and the systematic exploitation of the parameter space is used to compute the best set of finite Eulerian rotations for the chrons 5, 6, 6C, 11-12, 13, 18, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 32, 33, and 33r. This set of chrons and poles is used to discuss the evolution of the North Atlantic close to Iberia and, in particular, the onset and early development of the Azores Triple Junction area. We show that the relative motion between the Eurasian and the African plates can be coherently described in terms of rigid plate kinematics, respecting both the anomalies shapes and the precise location of the main structural elements of the area: the Pico Fracture Zone, the East Azores Fracture Zone, and the Gloria Fault. We distinguish from the magnetic point of view two different areas of the Azores plateau: the South Azores domain where almost undisturbed NNW magnetic lineations can be found and the Azores domain close to the topographic highs and with no systematic magnetic stripping with the exception of a few recent lineations, probably Matuyama and Brunhes. We present an approximate reconstruction of the plate configuration after chron 18 to conclude that the attachment of Iberia to Eurasia was younger than previously thought (lower Miocene), triggering the formation of the Azores domain, in which stretching took place essentially in the last 20 Ma at an average rate of $3.8 mm/a, and progressively attaching the South Azores domain to the African plate by a northward progression of the triple junction.

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Section: Magnetic Data Collationmentioning

confidence: 99%

Section: Continuous Reduction To the Polementioning

confidence: 99%

Section: Magnetic Data Collationmentioning

confidence: 99%

Section: Magnetic Data Collationmentioning

confidence: 99%

See 2 more Smart Citations

Reevaluation of magnetic chrons in the North Atlantic between 35°N and 47°N: Implications for the formation of the Azores Triple Junction and associated plateau

Luís¹,

Miranda²

2008

J. Geophys. Res.

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“…These short segments are offset right laterally by fracture zones slightly oblique to the spreading segments. The spreading rate is about 1 cm/year for the last 10 million years (Phillips et al, 1975). On a shorter time scale, the spreading rates have differed on opposite sides of the ridge.…”

Section: Background and Objectivesmentioning

confidence: 99%