Palaeomagnetism

Tarling, D. H.

doi:10.1007/978-94-009-5955-2

Cited by 166 publications

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“…2 AMS is a well known indicator of the direction of magma flow in basic dykes and the method has been used in several studies to define flow fabric. [35][36][37] …”

Section: Methodsmentioning

confidence: 99%

“…Goethite (α-FeOOH), pyrrhotite (FeS 1+X : 0.10 < x < 0.14) or pyrite (FeS 2 ) are known to be unstable at a high temperature range 120 -450 °C. [2][3][4] Monitoring of susceptibility during heating is necessary to indicate such chemical changes. Natural remanent magnetization can be contaminated by a magnetic moment of newly formed ferromagnetic mineral in the oven.…”

Section: Susceptibility Variation With Temperatures During Thermal Dementioning

confidence: 99%

“…1 Under certain physical and chemical conditions, pyrite will transform to ferromagnetic minerals, ie, pyrrhotite (FeS 1+X ), magnetite and haematite. 2,3,4 Therefore magnetic characteristics of rocks can be related to the palaeo-environment during the long history of rocks.…”

Section: Introductionmentioning

confidence: 99%

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Bhongsuwan¹,

Ponathong²

2002

ScienceAsia

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A total of 57 standard specimens are prepared from 31 oriented core samples drilled from the Thung-Yai redbed of Upper Jurassic -Lower Cretaceous age. All specimens are characterized magnetically. Results show that distributions of the magnetic susceptibility (73.5 -144.7 µSI), natural remanent magnetization (3.19-13.59 mA/m) and Köenigsberger ratio (0.96-3.65) of the specimens are similar to those of the Khorat redbeds. Low anisotropy degree Pj of 1 -7 % indicates a low degree of deformation in the Thung-Yai redbed. Distribution of the principal axes of susceptibility indicates an imbrication of the minimum axes (K 3 ) toward the West which is interpreted as the palaeo-current direction during deposition of sediments. There are probably gravitational and hydrodynamic forces of flowing water that affect the Thung-Yai redbed at the time of deposition. Analyses of magnetic data and fluorescent X-ray images indicate that magnetite and haematite are the predominant magnetic minerals in the Thung-Yai redbed. This shows a non-marine environment during sedimentation. Remanent magnetization derived from a high temperature range of 530 -630 °C directed at Dec/Inc = 32.6°/18.8°i s considered to be primary remanent magnetization and its pole position is at Plat/Plon = 57.8°N/ 184.6°E. This pole overlaps well with the pole position derived from the Khorat redbeds (Plat/Plon = 60.7°N/181.0°E). This indicates that the Shan-Thai block, the parent block of southern Thailand and Indochina block, the parent block of the Khorat plateau, have not moved with reference to each other since the Upper Jurassic -Lower Cretaceous.

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“…2 AMS is a well known indicator of the direction of magma flow in basic dykes and the method has been used in several studies to define flow fabric. [35][36][37] …”

Section: Methodsmentioning

confidence: 99%

Section: Susceptibility Variation With Temperatures During Thermal Dementioning

confidence: 99%

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Bhongsuwan¹,

Ponathong²

2002

ScienceAsia

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“…Here, the general dating principle is the alignment of fine magnetic particles in the Earth's magnetic field, i.e. the detrital remanent magnetisation or DRM, which preserves a record of the geomagnetic field's declination, inclination and intensity at the time of deposition (Tarling, 1983).…”

Section: Objectivesmentioning

confidence: 99%

Evidence of episodic coastal change during the Late Holocene: The Dungeness barrier complex, SE England

2009

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“…For their synthetic profile near 3OoS, they concluded that the spreading rate was decreasing to 30mm a-' by anomaly 27 times, with a slow increase to 55 mm a-' by anomaly 15 and then decreasing smoothly to the present rate of 32 mm a-'. This assessment was based on nine calibration points, with cubic spline fitting for anomalies between, and is hence very dependent on the reliability of the dating and spatial specification of these calibration pointsuncertainties for which were estimated by Tarling (1983) to be of the order of + 2 per cent. For the analyses presented here, it was considered inappropriate, at this stage, to undertake detailed corrections for accelerating/decelerating sea-floor spreading, as these may well introduce as many errors as they remove.…”

Section: The Primary Magnetic Anomaly Power Spectra and Their Signifimentioning

confidence: 99%

Periodicity of magnetic intensities in magnetic anomaly profiles: the Cenozoic of the South Atlantic

D’Argenio

Iorio

Tarling

1996

Geophysical Journal International

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Spectral analyses of several published magnetic anomaly profiles from Cande & Kent (1992a) were undertaken prior to analysing, in the same way, raw magnetic anomaly data from similar parts of the South Atlantic. It was found that similar and distinct medium and short wavelengths were present in both the published and raw data. When these are converted into the time domain using the average rate of spreading for each profile, these periodicities appear similar, possibly identical, to those expected from the long-term eccentricity orbital parameters ( Fischer, DeBoer & Premoli Silva 1990). While such correlations are not necessarily causative, they suggest that magnetohydrodynamical processes near the core-mantle boundary may be affected by gravitational changes due to planetary orbital perturbations.

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Palaeomagnetism

Cited by 166 publications

References 0 publications

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Evidence of episodic coastal change during the Late Holocene: The Dungeness barrier complex, SE England

Periodicity of magnetic intensities in magnetic anomaly profiles: the Cenozoic of the South Atlantic

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