Results 201 to 210 of about 3,470 (247)

A 2.14-Myr astronomically tuned record of relative geomagnetic paleointensity from the western Philippine Sea [PDF]

Journal of Geophysical Research, 2003
We present a 2.14-Myr astronomically tuned relative geomagnetic paleointensity record from the western Philippine Sea. Pseudosingle-domain titanomagnetite is the only magnetic mineral identified and variations in titanomagnetite concentration fall well ...
Andrew P Roberts, Wen-Tzong Liang
exaly   +2 more sources

Intrinsic paleointensity bias and the long-term history of the geodynamo

Science Advances, 2017
A key mechanism responsible for a systematic bias in the global geomagnetic paleointensity database. Many geodynamo models predict an inverse relationship between geomagnetic reversal frequency and field strength.
Aleksey V Smirnov, Evgeniy V Kulakov, M S Foucher   +2 more
exaly   +2 more sources

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Introduction to Paleointensity Articles

Reviews of Geophysics, 1988
After indicating the basis of the technique, its use with a cryogenic SQUID magnetometer is outlined, particular emphasis being given to the need for stringent reliability criteria. Comparison of results for some samples is made with results obtained using the Shaw alternating‐field technique, and the agreement is satisfactory.
Ronald T. Merrill, J. R. Heirtzler
openaire   +1 more source

Paleointensity determinations of lunar samples

Physics of the Earth and Planetary Interiors, 1977
Abstract Evidence for the existence of an ancient lunar field comes from the NRM of lunar rocks and from measurements of local lunar surface magnetic fields. Even when the Fe particles present in the rocks possess enough magnetic stability to preserve a record of the original magnetizing field, there are considerable difficulties in estimating the ...
D.W. Collinson, A. Stephenson
openaire   +1 more source

Beryllium ten production and relative paleointensity for the past 1.2 million years

Quaternary Science Reviews
Composite curves of relative paleointensity document the evolution of the geomagnetic field intensity during the past 1.2 Million years. Several records of production of 10 Be cosmogenic isotope from the 10 Be/ 9 Be ratio (referred to as Be-ratio ...
J. Valet, T. Savranskaia, Ramon Egli, Q. Simon, Franck Bassinot, N. Thouveny   +5 more
semanticscholar   +1 more source

A refined age calibrated paleosecular variation and relative paleointensity stack for the NW Barents Sea: Implication for geomagnetic field behavior during the Holocene

, 2020
Reconstruction of Paleomagnetic Secular Variation (PSV) of the geomagnetic field is fundamental both to assess geodynamo models and to obtain age constraints for rocks, sediments and archaeological material. We present refined age-calibrated Holocene PSV
C. Caricchi, L. Sagnotti, S. A. Campuzano, R. Lucchi, P. Macrì, M. Rebesco, A. Camerlenghi   +6 more
semanticscholar   +1 more source

Meteorite magnetization and paleointensity

Advances in Space Research, 1982
Abstract The five chemical classes of chondrite, i.e. E-, H-, L-, LL- and C-chondrite, and three major classes of achondrite, i.e. diogenite, eucrite plus howardite, and ureilite, are magnetically identified to respective separated domains on an Is (α)/Is versus Is diagram, where Is and Is (α) denote respectively the saturation magnetization and the ...
openaire   +1 more source

Latest Pleistocene and Holocene Geomagnetic Paleointensity on Hawaii

Science, 1993
Geomagnetic paleointensity determinations from radiocarbon-dated lava flows on the island of Hawaii provide an estimate of broad trends in paleointensity for Holocene time and offer a glimpse of intensity variations near the end of the last glacial period.
E A, Mankinen, D E, Champion
openaire   +2 more sources

Sawtooth paleointensity and reversals of the geomagnetic field

Physics of the Earth and Planetary Interiors, 1997
Abstract Valet and Meynadier (Valet, J.P., Meynadier, L., 1993) noted an intriguing sawtooth intensity pattern in sequences drilled during Leg 138 of the Ocean Drilling Program. The pattern is an almost linear decrease in intensity during stable polarity times followed by a rapid recovery or increase in intensity immediately after a reversal.
P.L. McFadden, R.T. Merrill
openaire   +1 more source

Paleointensity Bursts in the Geomagnetic Field History

Geomagnetism and Aeronomy, 2020
Regularities in the distribution of extreme (burst) increases in paleointensities from 3000 Ma to the present have been studied. Paleointensity bursts that exceed several times its average values Havg have been found to occur over the entire geomagnetic history.
A. Yu. Kurazhkovskii, N. A. Kurazhkovskaya, B. I. Klain   +2 more
openaire   +1 more source