Rare earth element composition of paleo-maar sediments (latestPleistocene - early Holocene), Jeju Island, Korea: implications forAsian dust record and monsoon climate
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- Rare earth element composition of paleo-maar sediments (latestPleistocene - early Holocene), Jeju Island, Korea: implications forAsian dust record and monsoon climate
- Lee, Min Kyung
Lee, Seung Hyoun
Lee, Yong Il
Yoon, Ho Il
- East Asian monsoon; Rare earth element; Jeju Island; Asian dust; Quaternary
- Issue Date
- Lee, Min Kyung., et al. 2014. Rare earth element composition of paleo-maar sediments (latestPleistocene - early Holocene), Jeju Island, Korea: implications forAsian dust record and monsoon climate. Quaternary International, 344: 32-42.
- The rare earth element (REE) composition of a 4.96 m-long sediment core retrieved from the Hanon
paleo-maar in Jeju Island, Korea was studied to investigate the East Asian monsoon variations during the
latest Pleistocene to early Holocene (22,300e9000 cal BP). The studied paleo-maar core sediment has
two restricted source materials with distinctively different geochemical signatures: Asian dust blown
from central Asia (especially northern China and Mongolia) and basement rock composed of trachybasalt.
The REE characteristics of sediments depend on the relative contribution of these two sources and
thus can be used to delineate the monsoon climate in Jeju Island. The proportion of Asian dust generally
decreased gradually from 67% at 22,300 cal BP, indicative of progressive weakening of the winter
monsoon strength in central Asia. Integration of the REE data with TOC and MS records reveals that the
summer monsoon strength in Jeju Island decreased from 22,300 cal BP until the last glacial maximum at
18,000 cal BP, and then increased to 14,000 cal BP. The abrupt intensification of the summer monsoon
occurred from 14,000 to 13,300 cal BP, followed by the weakened summer monsoon from 13,300 to
11,000 cal BP, in anti-phase with the strengthened winter monsoon in central Asia. In the early Holocene,
Jeju Island experienced further intensified summer monsoon strength.
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