Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Reconstruction of Changes in Eolian Particle Deposition Across the Mid-Pleistocene Transition in the Central Part of the North Pacific

중기 플라이스토세 전이기 전후 북태평양 중앙 해역 퇴적물에 기록된 풍성 퇴적물 입자 퇴적 양상 변화 복원

  • Lee, Sojung (Global Ocean Research Center, Korea Institute of Ocean Science & Technology) ;
  • Seo, Inah (Global Ocean Research Center, Korea Institute of Ocean Science & Technology) ;
  • Hyeong, Kiseong (Global Ocean Research Center, Korea Institute of Ocean Science & Technology)
  • 이소정 (한국해양과학기술원 대양자원연구센터) ;
  • 서인아 (한국해양과학기술원 대양자원연구센터) ;
  • 형기성 (한국해양과학기술원 대양자원연구센터)
  • Received : 2019.10.22
  • Accepted : 2019.12.17
  • Published : 2019.12.30
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Abstract

We investigated flux, grain size distribution, Nd-Sr isotope composition, mineral composition, and trace metal composition (REEs and Sc) of inorganic silicate fraction (ISF, mainly Asian dust with an unrestricted amount of volcanic materials) deposited during 600~1000 ka across the Mid-Pleistocene Transition at core NPGP 1401-2A (32°01'N, 178°59'E, 5205m) taken from the central part of the North Pacific. Our results reveal about a 2-fold increase in ISF flux after 800 ka, which is associated with an increase in La/Sc and a decrease in mean grain size. Asian dusts are finer than volcanic materials and La/Sc increases with the enhanced contribution of Asian dusts. Thus, increased flux after 800 ka can be explained by the increased contribution of Asian dusts relative to volcanic materials, likely due to an intensified Westerly Jet (WJ) and the drying of the Asian continent after the MPT. Mean grain size of ISF varies systematically in relation to glacial-interglacial cycles with a decrease during glacial stages, which is consistent with the previous results in the study area. Such a cyclical pattern is also attributed to the increase in the relative contribution of Asian dusts over volcanic components in glacial stages due to intensified WJ and drying of the Asian continent. Thus, it can be concluded that climate changes that had occurred across the MPT were similar to those of interglacial to glacial transitions at least in terms of the dust budget. Different from the Shatsky Rise, however, compositional changes associated with glacial-interglacial mean grain size fluctuations are not observed in Nd-Sr isotope ratios and trace element composition in our study of the Hess Rise. This may be attributed to the location of the study site far (> 4,000 km) from the volcanic sources. The volcanic component at the study site comprises less than 10% and varies within 3% over glacial-interglacial cycles. Such a small variation was not enough to imprint geochemical signals.

Keywords

References

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