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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.12
- 수록면
- 275 - 288 (14page)
- DOI
- https://doi.org/10.4217/OPR.2019.41.4.275
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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.
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참고문헌 (34)
참고문헌 신청
Biscaye PE / 1997 / Asian provenance of glacial dust (stage 2) in the Greenland Ice Sheet Project 2 ice core, Summit, Greenland / J Geophys Res Oceans 102(C12) : 26765 ~ 26781
Chen J / 2007 / Nd and Sr isotopic characteristics of Chinese deserts: Implications for the provenances of Asian dust / Geochim Cosmochim Ac 71(15) : 3904 ~ 3914
Chen Z / 2013 / Evolving sources of eolian detritus on the Chinese Loess Plateau since early Miocene: Tectonic and climatic controls / Earth Planet Sc Lett 371 : 220 ~ 225
Chuey JM / 1987 / Late Pleistocene paleoclimatology of the central equatorial Pacific: A quantitative record of eolian and carbonate deposition / Quaternary Res 28(3) : 323 ~ 339
Clark PU / 2006 / The middle Pleistocene transition: Characteristics, mechanisms, and implications for long-term changes in atmospheric pCO2 / Quaternary Sci Rev 25(23?24) : 3150 ~ 3184
Chen J / 2007 / Nd and Sr isotopic characteristics of Chinese deserts: Implications for the provenances of Asian dust / Geochim Cosmochim Ac 71(15) : 3904 ~ 3914
Chen Z / 2013 / Evolving sources of eolian detritus on the Chinese Loess Plateau since early Miocene: Tectonic and climatic controls / Earth Planet Sc Lett 371 : 220 ~ 225
Chuey JM / 1987 / Late Pleistocene paleoclimatology of the central equatorial Pacific: A quantitative record of eolian and carbonate deposition / Quaternary Res 28(3) : 323 ~ 339
Clark PU / 2006 / The middle Pleistocene transition: Characteristics, mechanisms, and implications for long-term changes in atmospheric pCO2 / Quaternary Sci Rev 25(23?24) : 3150 ~ 3184
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