Results 131 to 140 of about 3,470 (247)

COMPARISON OF NON-HEATING PALEOINTENSITY TECHNIQUES USING BASALTS FROM LEMPTÉGY VOLCANO, FRANCE AND SYNTHETIC MAGNETITE-BEARING SAMPLES

, 2014
Data of the strength of Earth’s magnetic field (paleointensity) in the geological past are crucial for understanding the geodynamo. Conventional paleointensity determination methods require heating a sample to a high temperature in one or more steps ...
Lerner, Geoffrey A.
core   +1 more source

Early Cambrian renewal of the geodynamo and the origin of inner core structure. [PDF]

Nat Commun, 2022
Zhou T, Tarduno JA, Nimmo F, Cottrell RD, Bono RK, Ibanez-Mejia M, Huang W, Hamilton M, Kodama K, Smirnov AV, Crummins B, Padgett F.   +11 more
europepmc   +1 more source

Limitations in correlation of regional relative geomagnetic paleointensity

, 2006
Time domain correlations of common features among relative paleointensity records from sedimentary cores are invaluable to paleomagnetism and paleoclimatology.
C. G. Constable, D. G. McMillan, Mcmillan, D. G., Constable, C. G.   +3 more
core   +1 more source

Local Magnetic Anomalies Explain Bias in Paleomagnetic Data: Consequences for Sampling

Geochemistry, Geophysics, Geosystems
Volcanic rocks are considered reliable recorders of past changes in the Earth's magnetic field. Recent flows, however, sometimes fail to produce the known magnetic field at the time of cooling. Previous research on Mt.
Romy Meyer, Lennart V. deGroot
doaj   +1 more source

Archaeomagnetism in the Levant and Mesopotamia Reveals the Largest Changes in the Geomagnetic Field. [PDF]

J Geophys Res Solid Earth, 2022
Shaar R, Gallet Y, Vaknin Y, Gonen L, Martin MAS, Adams MJ, Finkelstein I.   +6 more
europepmc   +1 more source

Paleointensity Estimates from Italian Kilns

Journal of geomagnetism and geoelectricity, 1986
Paleointensity estimates from three archeological sites are reported; field magnitudes (F) of 71.3±3.7μT and 75.3±1.2μT are obtained from two 1st century A. D. kilns, whilst a 3rd century B. C. kiln yields F=79.7±1.3μT. The present geomagnetic field in the area has a magnitude of 44.7μT.
openaire   +2 more sources

(Figure 2) Paleointensity of sediment core MD97-2140 (1654-1724cm)

, 2003
(Figure 2) Paleointensity of sediment core MD97-2140 (1654 ...
Nicolas Thouveny (6972332), Didier L Bourlès (7886123), Julien Carcaillet (7886117), Carcaillet, Julien, Thouveny, Nicolas, Bourlès, Didier L   +5 more
core   +1 more source

Cooling rate effects on the magnetization of volcanic rocks: Some implications for paleointensity determination [PDF]

Geofísica Internacional, 2006
Effects of variation of cooling rate in the acquisition of thermoremanent magnetization (TRM) are analyzed on a suite of volcanic rocks. We use a three-step cooling rate experimental procedure applied at three distinct temperatures of TRM acquisition ...
Jaime Urrutia-Fucugauchi, Avto Goguitchaichvili, Juan Morales   +2 more
doaj  

Is there a link between geomagnetic reversal frequency and paleointensity? A Bayesian approach

, 2014
Over the last 25 years, several studies have tested for a link between geomagnetic field intensity and reversal frequency. However, despite a large increase in the number of absolute paleointensity determinations, and improved methods for obtaining such ...
D. Heslop, R. Hawkins, Ingham, Elizabeth, Roberts, Andrew, E. Ingham, Heslop, David, M. Sambridge, A. P. Roberts, Hawkins, Rhys, Sambridge, Malcolm   +9 more
core   +1 more source

The effects of anisotropic and non-linear thermoremanent magnetizations on Thellier-type paleointensity data

, 2013
Numerous non-ideal factors can influence paleointensity data, but the detection of these factors remains problematic and new approaches to understanding how paleointensity data behave are needed.
Paterson, GA
core   +1 more source