Inclination shallowing in deep sea sediments from the North Atlantic

Celaya, Michael A.; Clement, Bradford M.

doi:10.1029/gl015i001p00052

Cited by 46 publications

(19 citation statements)

References 7 publications

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“…Kent and Spariosu, 1982; Tauxe et al , 1984). The observed inclination shallowing was attributed to the process of compaction and more recent studies of DSDP sites (Celaya and Clement, 1988; Arason and Levi, 1990a) have shown that inclination shallowing with depth is strongly correlated to decreasing sediment porosity, which is a measure of compaction.…”

Section: Sedimentary Magnetismmentioning

confidence: 80%

Sedimentary Magnetism, Environmental Magnetism, and Magnetostratigraphy

King

Channell

1991

Reviews of Geophysics

280

143

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Section: Sedimentary Magnetismmentioning

confidence: 80%

Sedimentary Magnetism, Environmental Magnetism, and Magnetostratigraphy

King

Channell

1991

Reviews of Geophysics

280

143

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“…In this paper we are particularly concerned with the postdepositional rotation of particle long axes into the horizontal plane, which produces a horizontal magnetic foliation and shallows the inclination of pDRM. A number of mechanisms cause such horizontal alignment, as previously mentioned, including compactionldewatering (Blow & Hamilton 1978;Anson & Kodama 1987;Celaya & Clement 1988), and heterocoagulation of magnetite and platy clay particles (Lu et al 1990). Vertical soft-sediment compaction can be considered an increment of strain (e.g.. Oertel 1983); 'unstraining' an NRM (Cogne & Perroud 1985, 1987 according to the inverse of a measured anisotropy matrix would again lead to the same inclination correction described in equation (1).…”

Section: Theorymentioning

confidence: 95%

Detrital Remanence, Inclination Errors, and Anhysteretic Remanence Anisotropy: Quantitative Model and Experimental Results

Jackson

Banerjee

Marvin

et al. 1991

Geophysical Journal International

145

172

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S U M M A R YWe suggest that inclination errors in detrital remanent magnetization (DRM) may be recognized and corrected by measurement of the anisotropy of anhysteretic remanent magnetization (ARM). ARM anisotropy reflects directional variations in the remanence capacity of relatively fine-grained magnetic particles in rocks or sediments, generally the same particles that carry the stable component of DRM.Relative vertical and horizontal DRM magnitudes are controlled by this directional remanence capacity, as well as by the alignment efficiency of the particle magnetic moments, which in turn is governed by the relative intensities of the vertical and horizontal components of the ambient magnetic field. Thus the respective vertical and horizontal components of palaeointensity , and therefore palaeofield inclination, may be obtained by normalizing the measured DRM components by parallel ARM intensities.Synthetic sediments containing silica, kaolin, and sized magnetite powders have previously been found to acquire experimental DRM with an inclination error that is a direct function of kaolin concentration. Further experiments have now shown that ARM anisotropy in the synthetic sediments is also a direct function of kaolin content, and thus a correlation exists between DRM inclination errors and ARM anisotropy. Multiplying the measured DRM vector by the inverse of the ARM anisotropy matrix yields an improved estimate of the actual laboratory depositional field in all cases. For samples with acicular 0.5 p m magnetite, this procedure reduces a mean inclination error of over 5" to less than 0.5". Samples with subequant magnetite of slightly larger grain size (0.75 pm) exhibit similar ARM anisotropy (-10 per cent), but somewhat larger inclination errors (-10'). We interpret this in terms of stronger horizontal alignment but weaker particle anisotropies for the larger, more equant magnetites.

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“…Depositional processes, however, such as rolling of particles after they have settled or flattening of platy particles due to gravity (see review by Verosub 1977) have been proposed for magnetite‐bearing rocks as a cause of shallower than expected magnetic inclination (Blow & Hamilton 1978; Celaya & Clement 1988; Arason & Levi 1990). Tauxe & Kent (1984) have also investigated similar processes for hematite‐bearing red sedimentary rocks.…”

Section: Introductionmentioning

confidence: 99%

Palaeomagnetism and magnetic anisotropy of Carboniferous red beds from the Maritime Provinces of Canada: evidence for shallow palaeomagnetic inclinations and implications for North American apparent polar wander

Bilardello

Kodama

2010

Geophysical Journal International

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S U M M A R YA palaeomagnetic and magnetic anisotropy study was conducted on the lower-middle Carboniferous Maringouin and Shepody red bed formations of the Maritime Provinces of Canada to detect and correct inclination shallowing. Because of the shallow inclinations commonly observed in red beds and the strong dependence of North America's Palaeo-Mesozoic apparent polar wander (APW) on red beds, inclination shallowing may substantially affect large portions of North America's APW path.Hematite is the primary magnetic mineral carrier in these red beds, accompanied by secondary magnetite, maghemite, goethite and pigmentary hematite.Thermal and chemical demagnetization of the Shepody Fm. successfully isolated characteristic remanence directions of D = 177 • , I = 20.4 • , α 95 = 6.5 • , N = 19 and D = 177.8 • I = 17.7 • , α 95 = 6.9 • , N = 16, respectively. Thermal demagnetization of the Maringouin Fm. isolated a characteristic remanence direction of D = 178.7 • , I = 24.9 • , α 95 = 14.5 • , N = 9.High field anisotropy of isothermal remanence followed by alternating field and thermal cleaning on leached samples was used to isolate the fabric of hematite. Individual particle anisotropy was measured directly from magnetic separates using a new technique. Hematite's magnetic fabric and particle anisotropy were used to apply an inclination correction.Our inclination corrections indicate up to 10 • of inclination shallowing, corresponding to corrected palaeopole positions of 27.2 • N, 118.3 • E, A 95 = 6.2 • and 27.4 • N, 117.2 • E, A 95 = 13.1 • for the Shepody and Maringouin formations, respectively. This correction corresponds to a ∼ 6 • increase in colatitude for Carboniferous North America, which translates into approximately a 650 km change in North America's palaeogeographic position. The proposed position of North America supports a Pangea B-type reconstruction.

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Inclination shallowing in deep sea sediments from the North Atlantic

Cited by 46 publications

References 7 publications

Sedimentary Magnetism, Environmental Magnetism, and Magnetostratigraphy

Sedimentary Magnetism, Environmental Magnetism, and Magnetostratigraphy

Detrital Remanence, Inclination Errors, and Anhysteretic Remanence Anisotropy: Quantitative Model and Experimental Results

Palaeomagnetism and magnetic anisotropy of Carboniferous red beds from the Maritime Provinces of Canada: evidence for shallow palaeomagnetic inclinations and implications for North American apparent polar wander

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