Milankovitch-scale environmental variation in the Banda Sea over the past 820ka: Fluctuation of the Indonesian Throughflow intensity

Yin Sheng Huang, Teh Quei Lee, Shu Kun Hsu

研究成果: 雜誌貢獻期刊論文同行評審

3 引文 斯高帕斯(Scopus)

摘要

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.

原文???core.languages.en_GB???
頁(從 - 到)1180-1188
頁數9
期刊Journal of Asian Earth Sciences
40
發行號6
DOIs
出版狀態已出版 - 2 4月 2011

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