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LATE QUATERNARY DISTRIBUTION CHARACTERS OF FORAMINIFERA AND OSTRACODA IN THE OFFSHORE AREA OF SOUTHERN SHANDONG PENINSULA AND PALEOENVIRONMENTAL EVOLUTION
Author(s): 
Pages: 130-146
Year: Issue:  2
Journal: Acta Micropalaeontologica Sinica

Keyword:  foraminiferaostracodalate Quaternarypaleoenvironmentmud clinoformthe Shandong Peninsula;
Abstract: The paleoenvironmental evolution off the southern Shandong Peninsula since the Marine Isotope Stage(MIS)4is studied based on the quantitative analyses of foraminifera and ostracoda communities sampled from a 16.2-meter sedimentary record of core QDZ03.The first terrestrial layer with several depositional gaps(depth 16.2—12.0m)was estimated to be formed during the Yellow Sea Regression Stage at 60ka BP(equal to MIS4)approximately.Due to the dramatic sea-level rise in Yumu interglacial stage(equal to MIS3),a littoral to terrestrial environment were dominated in the second to fifth layer.Part of sediment in MIS2was probably located above the upper part of the fifth layer,and most of the deposits in MIS2were lost.In 12—11ka BP,the littoral deposit in the upper part of the sixth layer(depth 9.1—8.6m)was formed in the process of seawater intrusion from the Yellow Sea into Qingdao area.Before the Maximum Flooding Surface(MFS)in Holocene(11.0—9.0ka BP,approximately),the midst of sixth layer(depth 8.6—7.7m)was formed under a nearshore environment with the further sea-level rising.As the sea-level reached its maximum at 6ka BP and then declined to the present level with stable characters,sediments of the mud clinoform extended by 7.7meter along the coast of South Yellow Sea as a result of the combined contributions made by Yellow River,small rivers and proximal coastal sediments of the Shandong Peninsula.The top 4.8-meter sediments with coarser sandy deposits and more abundant agglutinated foraminifera were probably related to the enhanced anthropogenic activities in coastal area since the last 3—2ka.
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