Results 181 to 190 of about 699 (206)
Some of the next articles are maybe not open access.
Sedimentary records of relative paleointensity of the geomagnetic field: Theory and practice
Reviews of Geophysics, 1993Sediments have proved irresistible targets for attempts at determining the relative variations in the Earth's magnetic field because of the possibility of long and continuous sequences that are well dated and have a reasonable global distribution. The assumption underlying paleointensity studies using sedimentary sequences is that sediments retain a ...
openaire +1 more source
A relative geomagnetic paleointensity stack from Ontong‐Java Plateau sediments for the Matuyama
Journal of Geophysical Research: Solid Earth, 1999We present a stack of geomagnetic paleointensity estimates for the Matuyama Chron (0.778–2.582 Ma). Sedimentary magnetizations from 4 Ocean Drilling Program (ODP) cores from the Ontong‐Java Plateau (OJP) are analyzed with thermal techniques. Thellier‐Thellier experiments are used to determine magnetic properties and indicate that a thermal treatment to
Yvo S. Kok, Lisa Tauxe
openaire +1 more source
On the climatic contamination of relative paleointensity estimations from sediments
A fundamental problem of relative paleointensity (RPI) estimations using marine sediments is that magnetic compositional variations induced by environmental changes may influence RPI estimations, which is known as climatic contamination or lithological contamination. Valet et al.Toshitsugu Yamazaki +4 more
openaire +1 more source
Journal of Geophysical Research: Solid Earth, 1990
Piston cores from the Ontong‐Java Plateau collected during the Eurydice expedition have been used to estimate regional geomagnetic paleointensity. Rock magnetic measurements of the sediments show that (1) the remanence is carried by stable pseudo‐single domain magnetite, (2) the grain sizes and concentrations are relatively uniform with respect to the ...
Lisa Tauxe, Guoping Wu
openaire +1 more source
Piston cores from the Ontong‐Java Plateau collected during the Eurydice expedition have been used to estimate regional geomagnetic paleointensity. Rock magnetic measurements of the sediments show that (1) the remanence is carried by stable pseudo‐single domain magnetite, (2) the grain sizes and concentrations are relatively uniform with respect to the ...
Lisa Tauxe, Guoping Wu
openaire +1 more source
Physics of the Earth and Planetary Interiors, 2006
Abstract The intensity of Earth’s magnetic field has been modeled as a continuing sequence of growths and decays due to a rotating parametric instability (RPI) of the fluid core. Taking paleomagnetic intensity as a proxy for the turbulent fluid velocity field, timescales of motion in the fluid core and geodynamo can be inferred from estimates of ...
Ross Baker +3 more
openaire +1 more source
Abstract The intensity of Earth’s magnetic field has been modeled as a continuing sequence of growths and decays due to a rotating parametric instability (RPI) of the fluid core. Taking paleomagnetic intensity as a proxy for the turbulent fluid velocity field, timescales of motion in the fluid core and geodynamo can be inferred from estimates of ...
Ross Baker +3 more
openaire +1 more source
Paleomagnetism and Relative Paleointensity of Estremenho Limestone Massif stalagmites, from Portugal
Speleothems magnetism is considered an excellent recorder of short-lived variations of the Earth’s magnetic field. Here we provide new geochronological, petrographic, paleomagnetic, and rock magnetic data of a stalagmite from the Estremenho Limestone Massif (from Central Portugal). The stalagmite was dated at 114.7 (±1.5) k.y.Rafael Dinis +9 more
openaire +1 more source
On improving the selection of Thellier-type paleointensity data
Geochemistry, Geophysics, Geosystems, 2014Greig A Paterson +2 more
exaly