Results 91 to 100 of about 1,861 (213)

Records of geomagnetic reversals from volcanic islands of French Polynesia : 2. Paleomagnetic study of a flow sequence (1.2-0.6 Ma) from the island of Tahiti and discussion of reversal models [PDF]

, 1990
Une séquence volcanique de 700 m d'épaisseur a été échantillonée dans la vallée du Punaruu (Tahiti). Les résultats de l'étude paléomagnétique montrent que la séquence a enregistré 4 inversions du champ magnétique terrestre. Les données géochronologiques (
Chauvin, A., Duncan, R.A., Roperch, Pierrick   +2 more
core  

Laschamp Excursion at Mono Lake? [PDF]

, 2002
The Laschamp Geomagnetic Excursion (ca. 41 ka) and a related increase of cosmogenic nuclides provides a global tie point among sedimentary and ice core records.
Hemming, Sidney R., Kent, Dennis V., Turrin, Brent D.   +2 more
core   +2 more sources

Linearity of natural versus laboratory-imparted remanence demagnetization diagram and reliability of relative paleointensity estimation

Earth, Planets and Space
Information on geomagnetic field intensity in the past is essential for understanding the behavior and mechanism of the geodynamo. A fundamental unresolved problem of relative paleointensity (RPI) estimations from marine sediments is that changes in the ...
Toshitsugu Yamazaki, Jiaxi Li
doaj   +1 more source

The glacial cycles and cosmic rays

, 2004
The cause of the glacial cycles remains a mystery. The origin is widely accepted to be astronomical since paleoclimatic archives contain strong spectral components that match the frequencies of Earth's orbital modulation.
Kirkby, J., Mangini, A., Muller, R. A.
core  

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 10Be cosmogenic isotope from the 10Be/9Be ratio (referred to as Be-ratio) covering this period have also been acquired. We add here new 10Be records to the database and produce a first
Valet, Jean-Pierre, Savranskaia, Tatiana, Egli, Ramon, Simon, Quentin, Bassinot, Franck, Thouveny, Nicolas   +5 more
openaire   +3 more sources

Geomagnetic relative paleointensity and direction during the last 40,000 years obtained from a sediment core in the Nankai Trough

Earth, Planets and Space
Construction of regional geomagnetic secular variation curves for the last several tens of thousands of years is important for understanding the behavior of non-dipole fields and applications to geochronology.
Ryoya Goto, Toshitsugu Yamazaki, Natsumi Okutsu, Juichiro Ashi   +3 more
doaj   +1 more source

Cooling Following the Magnetic Field Weakening During the Matuyama–Brunhes Transition Recorded by Paks Loess, Hungary

Quaternary
Detailed paleomagnetic and rock magnetic investigations of the Paks loess (Hungary) were conducted to determine the stratigraphic position of the Matuyama–Brunhes Transition (MBT) and to attempt to reveal the sign of any possible influences of ...
Balázs Bradák, Masayuki Hyodo, Erzsébet Horváth   +2 more
doaj   +1 more source

Umbria-Marche Basin, Central Italy: A Reference Section for the Aptian-Albian Interval at Low Latitudes

Scientific Drilling, 2012
Within the Cretaceous Period, the Aptian-Albian interval (125–99.6 Ma, Ogg et al., 2008) was a critical time on a global scale. This is evident from 1) changes in the nature of the ocean-climate system brought about by increased ocean crust production ...
Renato Paes de Almeida, Grasiane Luz Mathias, Jairo Savian, Liliane Janikian, Fabrizio Frontalini, Gerson Fauth, Carla Bucci, Giuseppe Bancalà, Luigi Jovane, Rodolfo Coccioni, Ricardo Ivan Ferreira da Trindade   +10 more
doaj   +1 more source

Long-teta VRM and relative paleointensity estimates in sediments

, 1999
Geomagnetic paleointensity measurements from sedimentary records can be severely affected by viscous remanent magnetization (VRM). We present a method for determining varying amounts of long-term VRM acquired during the present polarity interval, using the typically non-linear relationship between acquisition of artificial magnetization and ...
Kok, Yvo S., Tauxe, Lisa
openaire   +1 more source

Reconstruction of high-resolution paleomagnetic variations in the middle Gauss chronozone, including the upper and lower boundaries of the Mammoth reversed subchronozone

Earth, Planets and Space
In this study, we provide paleomagnetic records, including the upper and lower boundaries of the Mammoth reversed subchronozone, reconstructed from a continuous outcrop of the upper marine Pliocene in the southernmost part of the Boso Peninsula, which is
Akihiro Tanimoto, Makoto Okada, Ryota Hayashi   +2 more
doaj   +1 more source