Yang Lihong et al. (2002): Radiolarian record to paleoecology environment change events over the past 1.2 MaBP in the southern South China Sea

Leg/Site/Hole:
ODP 184
ODP 184 1143
Identifier:
2003-014797
georefid

Creator:
Yang Lihong
Chinese Academy of Sciences, South China Sea Institute of Oceanology, Guangzhou, China
author

Chen Muhong
Tongji University, China
author

Wang Rujian
author

Zhen Fan
author

Identification:
Radiolarian record to paleoecology environment change events over the past 1.2 MaBP in the southern South China Sea
2002
Chinese Science Bulletin
Science Press, Beijing, China
47
17
1478-1483
This note studies the Radiolarian fossil groups since 1.2 MaBP in ODP leg 184 site 1143, the southern South China Sea (SCS). The result shows that radiolarian abundance experienced a significant variation: before 0.9 MaBP it remained at the extremely low level, but increased with low extent between 0.9-0.65 Ma, which corresponded to the Mid-Pleistocene Transition stage, and it increased rapidly after 0.65 MaBP. During the whole process, the average abundance became higher and higher in each stage, and showed regularly periodic fluctuations. The obvious increase after 0.65 MaBP is inferred to result from the enhanced upwelling in this region, which was induced by the intensified monsoon circulation after the "Mid-Pleistocene Transition". An outstanding result of the spectral analyses is that a long oscillation of approximately 0.2 Ma cycle was found in the records of radiolarian abundance and complex diversity, which corresponds well to the result of other paleoceanographic indexes. This probably indicated a special cycle characteristic of paleoecological environment evolution in this area. In addition, all of the radiolarian indexes show an obvious boundary in about 0.47 MaBP, indicating the abrupt variation of the community structure and radiolarian abundance level before and after 0.47 MaBP. So we suppose that there existed a distinct change event of oceanic ecology environment during that period.
English
Serial
Coverage:Geographic coordinates:
North:9.2143
West:113.1707East: 113.1707
South:9.2143

Quaternary geology; Cenozoic; Invertebrata; Leg 184; microfossils; middle Pleistocene; North Pacific; Northwest Pacific; Ocean Drilling Program; ODP Site 1143; Pacific Ocean; paleo-oceanography; paleoecology; paleoenvironment; Pleistocene; Protista; Quaternary; Radiolaria; reconstruction; South China Sea; southern South China Sea; West Pacific;

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