HR: 0830h
AN: GP31D-0773    [PDF]
TI: Paleomagnetic Study of Core MD012380 from Banda Sea
AU: * Lee, T
EM: tqlee@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Nankang, Taipei, 115 Taiwan
AU: Huang, Y
AF: Institute of Geophysics, NCU, Wu-Cheng Li, Chung-li, Tao-Yuan, 320 Taiwan
AU: Chen, C
AF: Institute of Geosciences, NTU, No. 1, Section 4, Russerfol Road, Taipei, 107 Taiwan
AU: Yang, T
AF: Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Nankang, Taipei, 115 Taiwan
AU: Hsu, S
AF: Institute of Geophysics, NCU, Wu-Cheng Li, Chung-li, Tao-Yuan, 320 Taiwan
AU: Wei, K
AF: Institute of Geosciences, NTU, No. 1, Section 4, Russerfol Road, Taipei, 107 Taiwan
AB: This study presents the paleomagnetic results of core MD012380 taken from Banda Sea during IMAGES VII cruise in 2001. The locality of the coring site is 126o 54.25­İE and 5o45.64­İS, and the water depth is about 3232m. The total recovered length of this core is 39.9 m. The simulated paleo-intensity pattern is well correlated to that of the SINT 800 (Guyodo and Valet, 1999). Several magnetic events and excursions, such as Blake, Jarmaica, Lavantine, Big Lost Emperor, Delta and B/M Boundary could be identified. These events appeared at the depths of about 13.84 m, 18.05 m, 22.75 m, 31.81 m, 35.89 m, 38.70 m, respectively. Paleoinclination data also indicate that the boundary of Brunhes and Matuyama epochs appeared at the depth of 38.7 m. So, the paleomagnetic result is used to construct the age model of this core. Then, apply it to the studied oxygen isotope pattern and compare to that proposed by Bassinot et al. (1994), they are well correlated. In addition, the LAD of P. lacunosa is found at the depth of 28.4 m, which also supports the proposed age model. Result of magnetic susceptibility (c) shows several high peaks, especially at the bottom portion, which might relate to the volcanic activity in the surrounding area. Generally, high values occurred at the interglacial periods and low values appeared at the interglacial periods. However, magnetic susceptibility has a special increasing trend from stage 8 to the early stage 5. It may be worthy of further study.
DE: 1512 Environmental magnetism
DE: 1521 Paleointensity
DE: 1522 Paleomagnetic secular variation
DE: 1560 Time variations--secular and long term
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2003 Fall Meeting