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| Laj, C; Kissel, C; Roberts, Ap. |
| [1] We present four new records of the Iceland Basin Excursion (IBE) and five new records of the Laschamp Excursion (LE) obtained from rapidly deposited marine sediments in the North Atlantic Ocean, the Nordic Seas, the Gulf of Mexico, the South China Sea, and the southern Indian Ocean. Marked minima in relative paleointensity correspond with the paleomagnetic directional changes associated with all of the excursion records. The virtual geomagnetic pole (VGP) paths of the four IBE records are all similar. The VGPs move southward over Europe and Africa, reaching the southern hemisphere (three reach Antarctica), and then move to more eastern longitudes before returning northward over Australia and east Asia, describing a large counterclockwise loop. The same... |
| Tipo: Text |
Palavras-chave: Virtual geomagnetic paths. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00239/34977/33475.pdf |
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| Colin, C; Turpin, L; Blamart, D; Frank, N; Kissel, C; Duchamp, S. |
| A high-resolution study of mineralogy and major element geochemistry combined with Sr and Nd isotopes has been conducted on high sedimentation rate cores collected off the Irrawaddy River mouth in the Andaman Sea and the Bay of Bengal to reconstruct the erosional and weathering history of the Irrawaddy River basin. In both cores, epsilon Nd(0) values imply that both glacial and interglacial sediments share a common crustal source: the Irrawaddy River. Strong glacial/interglacial cycles are recorded by Sr-87/Sr-86: interglacial periods yield values between 0.713 and 0.717, whereas glacial periods show higher values between 0.717 and 0.719. Variations of the pedogenic clays (smectite and kaolinite) to primary mineral (feldspar, quartz, illite, and chlorite)... |
| Tipo: Text |
Palavras-chave: Sr and Nd isotopes; Major elements; Erosional history; Indo-Burman Ranges; Irrawaddy River. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00235/34579/33111.pdf |
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