Modeling the oceanic magnetic source layer

Schouten, Hans; Denham, Charles R.

doi:10.1029/me002p0151

Cited by 60 publications

(40 citation statements)

References 27 publications

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“…In order to explain these observations, we have to assume tilted boundaries. These complicated structures of the oceanic crust have been proposed based on the forward modeling and the measurements using deep-tow instruments and/or submersibles (Schouten and Denham, 1979;Kidd, 1977;Macdonald et al, 1983). However, more direct measurements for the magnetic structure of the oceanic crust are required to establish the structure.…”

Section: Discussionmentioning

confidence: 99%

Magnetization of the Oceanic Crust Inferred from Magnetic Logging in Hole 395A

Hamano¹,

Kinoshita²

1990

Proceedings of the Ocean Drilling Program, 106/109 Scientific Results

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Three components of the magnetic field in Hole 395A have been measured by a newly developed magnetometer. Observed variations of the vertical and the horizontal components of the magnetic field were interpreted by use of simple model calculations. The results indicate that the size of the homogeneously magnetized body around the hole is about 100 m, and that the normal-reverse boundary observed at 260 m sub-bottom depth in Hole 395A is tilted in an east-west direction by about 30°.

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Section: Discussionmentioning

confidence: 99%

Magnetization of the Oceanic Crust Inferred from Magnetic Logging in Hole 395A

Hamano¹,

Kinoshita²

1990

Proceedings of the Ocean Drilling Program, 106/109 Scientific Results

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“…Such a narrow dike intrusion width is supported by independent statistical observations of the proportion of dikes in ophiolites that exhibit one-sided cooling, due to having been split by a subsequent dike [1,17,18]. Studies of marine magnetic anomaly reversal widths and variability [4][5][6][7][8] suggest a relatively wide zone of lava emplacement, 1-3 km wide. However, these data can not resolve the relative contributions of the width of the intrusion zone and lava flow distribution to the lava emplacement process.…”

Section: £££ Hooft Et Al J Earth and Planetary Science Lerrers 14mentioning

confidence: 60%

“…Models of the emplacement geometry of the extrusive section show that the width of the dike intrusion zone and the length of lava flows control the thickness and thickening rate of layer 2A [e.g. Kidd, 1977;Atwater, 1979;Schouten and Denham, 1979;Palmason, 1980;Hooft et al, 1996]. The relative uniformity of on-axis layer 2A thickness along the ridge axis thus indicates that the dike injection zone has a fairly constant width throughout this region.…”

Section: Thickness and Construction Of The Extrusive Layermentioning

confidence: 99%

“…[ 4,5]). At an active spreading center, steady state is only achieved statistically, since the accretion process is a series of discrete, successive events.…”

Section: Unimodal Lava Emplacement Modelmentioning

confidence: 99%

“…These two magmatic processes generate an upper crustal structure composed of lavas piled on top of one another, underlain by a sheeted dike complex. Constraints on the processes of upper crustal construction have come from ophiolite studies [1 ,2], observations in active rifts (e.g., Iceland [3D, modeling of marine magnetic anomaly shapes and transition thicknesses [4][5][6][7][8], mapping [9][10][11][12][13][14], dating [15], and drilling (e.g. DSDP Hole 504B [I6D of young ocean crust.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The influence of magma supply and eruptive processes on axial morphology, crustal construction and magma chambers

Hooft¹

1996

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Investigation of a marine magnetic polarity reversal boundary in cross section at the northern boundary of the Kane Megamullion, Mid‐Atlantic Ridge, 23°40′N

Tivey

2016

JGR Solid Earth

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Near‐bottom magnetic field measurements made by the submersible Nautile during the 1992 Kanaut Expedition define the cross‐sectional geometry of magnetic polarity reversal boundaries and the vertical variation of crustal magnetization in lower oceanic crust exposed along the Kane Transform Fault (TF) at the northern boundary of the Kane Megamullion (KMM). The KMM exposes lower crust and upper mantle rocks on a low‐angle normal fault that was active between 3.3 Ma and 2.1 Ma. The geometry of the polarity boundaries is estimated from an inversion of the submarine magnetic data for crustal magnetization. In general, the polarity boundaries dip away from the ridge axis along the Kane TF scarp, with a west dipping angle of ~45° in the shallow (<1 km) crust and <20° in the deeper crust. The existence of the magnetic polarity boundaries (e.g., C2r.2r/C2An.1n, ~2.581 Ma) indicates that the lower crustal gabbros and upper mantle serpentinized peridotites are able to record a coherent magnetic signal. Our results support the conclusion of Williams (2007) that the lower crust cools through the Curie temperature of magnetite to become magnetic, with the polarity boundaries representing both frozen isotherms and isochrons. We also test the effects of the rotation of this isotherm structure and/or footwall rotation and find that the magnetic polarity boundary geometry is not sensitive to these directional changes.

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Modeling the oceanic magnetic source layer

Cited by 60 publications

References 27 publications

Magnetization of the Oceanic Crust Inferred from Magnetic Logging in Hole 395A

Magnetization of the Oceanic Crust Inferred from Magnetic Logging in Hole 395A

The influence of magma supply and eruptive processes on axial morphology, crustal construction and magma chambers

Investigation of a marine magnetic polarity reversal boundary in cross section at the northern boundary of the Kane Megamullion, Mid‐Atlantic Ridge, 23°40′N

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