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| Yamazaki, T; Oda, H. |
| We have conducted a paleomagnetic study of six sediment cores taken from the equatorial Pacific, three from the West Caroline Basin and three from the Manihiki Plateau, in order to make a relative paleointensity stack during the Matuyama and late Gauss Chrons. The age of the bottom of the cores ranges from 1.2 to 3.0 Ma. The sediments show little downcore changes in the proxies of magnetic grain size and mineralogy and are hence suitable for estimating relative paleointensity. The age of the cores is controlled by correlating variations in magnetic concentration ( magnetic susceptibility and/or anhysteretic remanent magnetization (ARM)) to target oxygen-isotope (delta(18)O) curves. All cores from the Manihiki Plateau show an upward decrease of the natural... |
| Tipo: Text |
Palavras-chave: Equatorial Pacific; Excursion; Orbital modulation; Paleointensity; Paleomagnetism. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00232/34285/32650.pdf |
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| Yamazaki, Toshitsugu; Kanamatsu, Toshiya. |
| A paleomagnetic study was conducted on a sediment core KR0310-PC1 taken from the central North Pacific in order to obtain a relative paleointensity record in the Matuyama chron from this region. The core reached to about 1.6 Ma. The age control is based on the correlation of the S ratio (S-0.1T) variations with a global oxygen-isotope stack. Isothermal remanent magnetization (IRM) was used as the normalizer of the relative paleointensity estimation; anhysteretic remanent magnetization (ARM) was not adopted because ARM is sensitive to magnetostatic interaction among magnetic particles, which is evidenced in these sediments by an inverse correlation between the ratio of ARM to saturation IRM (SIRM) and SIRM without significant magnetic grain-size changes.... |
| Tipo: Text |
Palavras-chave: Paleomagnetism; Paleointensity; North Pacific; Orbital modulation; Normalizer; Magnetostatic interaction. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00235/34631/32963.pdf |
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