Metal enrichment and magnetic properties of core sediments from the eastern Yellow Sea, East Asia: Implications for paleo-depositional change during the late Pleistocene/Holocene transition
- Metal enrichment and magnetic properties of core sediments from the eastern Yellow Sea, East Asia: Implications for paleo-depositional change during the late Pleistocene/Holocene transition
- 권만재; 윤성택; 도성재; 손병국; 최경식; 김원년
- Issue Date
- Quaternary international : the journal of the International Union for Quaternary Research
- VOL 230, NO 1-2, 95-105
- To investigate the paleo-depositional environments, sediment cores YJ1 and YJ2 from a tidal flat of the
eastern Yellow Sea were analyzed for the vertical variations of metal concentrations, particle size, clay
mineralogy, magnetic properties, and total organic carbon content (TOC). Fe (and Mn) concentrations
determined by both partial and total acid extraction increased at 15 m depth in YJ1 and 10 m in YJ2. The
layer directly below these Fe-rich brownish horizons showed dramatic decreases in clay mineral content
and trace metals (Zn, Pb, Cu, Cr, Co, Ni, and As), but increases in sand fraction, magnetic susceptibility,
and TOC. All results were inverse in the upper metal-rich layer. These dramatic changes in multiparameters
are likely due to an environmental change during the late Pleistocene/Holocene transition.
The rapid environmental change (sand-rich and oxic -> clay-rich and anoxic) resulted in aqueous
dissolution of redox-sensitive metals (e.g., Fe and Mn) from the lower sandy layer materials. The dissolved
metals diffused upward and concomitantly were immobilized within the upper clay-rich layer.
The reprecipitated Fe (or Mn) (hydro)oxides then scavenged trace metals by coprecipitation and/or
adsorption. This study suggests that metal distribution patterns can provide new insights into the paleodepositional
processes during the Pleistocene–Holocene period.
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