TY - JOUR
T1 - Milankovitch-scale environmental variation in the Banda Sea over the past 820ka
T2 - Fluctuation of the Indonesian Throughflow intensity
AU - Huang, Yin Sheng
AU - Lee, Teh Quei
AU - Hsu, Shu Kun
N1 - Funding Information:
We would like to express our appreciation to all the researchers and staffs on the R.V. Marion Dufresne, during the IMAGES Cruise VII, to collect such a high quality core from the Banda Sea. Also we like to acknowledge the National Core Laboratory located at the National Taiwan Ocean University for the help of sampling the core; members in the Paleomagnetic Laboratory, institute of Earth Sciences, Academia Sinica for helping on the magnetic experiments and members of the Marine Geophysical Research group, National Central University for valuable discussion. The Financial support came from the National Science Council of Taiwan under the Grant NSC91-2611-M-001-003-IM. The figures were plotted by using the GMT software ( Wessel and Smith, 1998 ).
PY - 2011/4/2
Y1 - 2011/4/2
N2 - We describe the environmental variation in the Banda Sea over the past 820. ka by using the magnetic parameters and oxygen isotope data from the core MD012380. Overall, characteristics of the magnetic parameters show simultaneous variation with marine isotope stage (MIS), especially in the last 420. ka. There are fewer, coarser and more oxidative magnetic minerals in glacial periods, and turn to opposite conditions in interglacial periods. Spectral results clearly present the Milankovitch periods over the last 820. ka, especially the eccentricity period (400-ka and 100-ka). However, the magnetic data shows different pattern before and after 420. ka. Thus, we segmented the time-series data into two periods: MIS 20 to MIS 12 and MIS 11 to MIS 1. During MIS 20 to MIS 12, the spectra of magnetic data show clear periods related to the obliquity (41-ka) and precession (23-ka and 19-ka), while they present only the eccentricity period (100-ka) during MIS 11 to MIS 1. This feature, which splits the late Pleistocene at around 420. ka, could be attributed to the mid-Brunhes event (MBE). In the Banda Sea, main factor controlling the variation of the magnetic minerals is considered as the fluctuation of the Indonesian Throughflow (ITF) intensity due to sea-level change. Thus, the magnetic data show clear 400-ka and 100-ka periods (main MIS cycle). Besides, the eccentricity signals are relatively dominant in the last ~420. ka, implying that the ITF might become more important after the MBE in the Banda Sea.
AB - We describe the environmental variation in the Banda Sea over the past 820. ka by using the magnetic parameters and oxygen isotope data from the core MD012380. Overall, characteristics of the magnetic parameters show simultaneous variation with marine isotope stage (MIS), especially in the last 420. ka. There are fewer, coarser and more oxidative magnetic minerals in glacial periods, and turn to opposite conditions in interglacial periods. Spectral results clearly present the Milankovitch periods over the last 820. ka, especially the eccentricity period (400-ka and 100-ka). However, the magnetic data shows different pattern before and after 420. ka. Thus, we segmented the time-series data into two periods: MIS 20 to MIS 12 and MIS 11 to MIS 1. During MIS 20 to MIS 12, the spectra of magnetic data show clear periods related to the obliquity (41-ka) and precession (23-ka and 19-ka), while they present only the eccentricity period (100-ka) during MIS 11 to MIS 1. This feature, which splits the late Pleistocene at around 420. ka, could be attributed to the mid-Brunhes event (MBE). In the Banda Sea, main factor controlling the variation of the magnetic minerals is considered as the fluctuation of the Indonesian Throughflow (ITF) intensity due to sea-level change. Thus, the magnetic data show clear 400-ka and 100-ka periods (main MIS cycle). Besides, the eccentricity signals are relatively dominant in the last ~420. ka, implying that the ITF might become more important after the MBE in the Banda Sea.
KW - Banda Sea
KW - Indonesian Throughflow
KW - Mid-Brunhes event
KW - Milankovitch cycle
UR - http://www.scopus.com/inward/record.url?scp=79952183637&partnerID=8YFLogxK
U2 - 10.1016/j.jseaes.2010.08.011
DO - 10.1016/j.jseaes.2010.08.011
M3 - 期刊論文
AN - SCOPUS:79952183637
SN - 1367-9120
VL - 40
SP - 1180
EP - 1188
JO - Journal of Asian Earth Sciences
JF - Journal of Asian Earth Sciences
IS - 6
ER -