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| Horng, Cs; Lee, My; Palike, H; Wei, Ky; Liang, Wt; Lizuka, Y; Torii, M. |
| We present a magnetostratigraphic record from the western Philippine Sea that is tied to a marine delta(18)O record for the past 2.14 million years. The ages of geomagnetic reversals were astronomically calibrated by tuning the oxygen isotopic stratigraphy, yielding a chronology for the following subchrons: Matuyama./Brunhes boundary, 781 +/- 3 ka (slightly above delta(18)O Stage 19.3); top of the Santa Rosa polarity interval, 920 +/- 2 ka (Stage 23/24); base of the Santa Rosa polarity interval, 925 +/- 1 ka (Stage 24); top of the Jaramillo subchron, 988 +/- 3 ka (Stage 27); base of the Jaramillo subchron, 1072 +/- 2 ka (Stage 3 1); top of the Cobb Mountain subchron, 1173 +/- 4 ka (Stage 35/36); base of the Cobb Mountain subehron, 1185 +/- 5 ka (Stage 36);... |
| Tipo: Text |
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| Ano: 2002 |
URL: https://archimer.ifremer.fr/doc/00223/33413/31898.pdf |
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| Horng, Cs; Roberts, Ap; Liang, Wt. |
| 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 within the accepted limits for relative paleointensity variations. No significant temporally persistent periodicities are observed in wavelet analyses of the paleointensity time series or in the rock magnetic parameters used for relative paleointensity normalization. This suggests that our paleointensity record is largely free of rock magnetic or lithological artefacts and that it represents a reliable record of geomagnetic behavior with no evidence for modulation of the field at Earth orbital periods. The... |
| Tipo: Text |
Palavras-chave: Geomagnetic paleointensity; Magnetostratigraphy; Spectral analysis; Wavelet analysis; Philippine Sea. |
| Ano: 2003 |
URL: https://archimer.ifremer.fr/doc/00224/33554/31978.pdf |
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