热带东太平洋晚第四纪的古海洋及古气候记录

肖文申; 王汝建; 叶瑛

Volume 31 Issue 2

Mar. 2006

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XIAO Wen-shen, WANG Ru-jian, YE Ying, 2006. Late Quaternary Paleoceanographic and Paleoclimatic Records in the Tropical East Pacific Ocean. Earth Science, 31(2): 143-150.

Citation:

XIAO Wen-shen, WANG Ru-jian, YE Ying, 2006. Late Quaternary Paleoceanographic and Paleoclimatic Records in the Tropical East Pacific Ocean. Earth Science, 31(2): 143-150.

XIAO Wen-shen, WANG Ru-jian, YE Ying, 2006. Late Quaternary Paleoceanographic and Paleoclimatic Records in the Tropical East Pacific Ocean. Earth Science, 31(2): 143-150.

Citation:

XIAO Wen-shen, WANG Ru-jian, YE Ying, 2006. Late Quaternary Paleoceanographic and Paleoclimatic Records in the Tropical East Pacific Ocean. Earth Science, 31(2): 143-150.

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Late Quaternary Paleoceanographic and Paleoclimatic Records in the Tropical East Pacific Ocean

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
Department of Earth Science, Zhejiang University, Hangzhou 310012, China

Received Date: 2005-03-11
Publish Date: 2006-03-25

Abstract

Abstract

Radiolarians studied in Core 8001 of the northeast equatorial Pacific show that the first appearance datum(FAD) of Buccinospharea invaginata and Collosphaera tuberosa occur at depths of 22 and 45 cm respectively, and their FAD ages are 0.21 and 0.42 Ma. The stratigraphic framework of this core is established by the combination of the two FAD ages with the SPECMAP isotopic records in deep-sea sediments. Variations of radiolarian abundance, biogenic opal, organic carbon and grain size in this core indicate that the high radiolarian abundance during the MIS 11, 9 -8.4, 5 -3 and 1, with the high abundance of Quaternary and Eocene-Oligocene species, corresponds to the high median and mean grain sizes. Organic carbon increased during the MIS 5, reflecting the enhancing trade wind, which brought on increasing grain size in conveyed terrestrial detritus. The intensive north equatorial current led to the upwelling becoming stronger and high surface productivity, together with enhanced activity in the Antarctic bottom water. The low radiolarian abundance during the MIS 10, 8.3 -6 and 2, coinciding with the low abundances of the Quaternary and Eocene-Oligocene species, corresponds to low median and mean grain sizes. This implies the weak trade wind caused the decreasing grain size of the transported terrestrial detritus and the slack north equatorial current resulted in the weak upwelling and low surface productivity, coming along the weak activity of the Antarctic bottom water.
- radiolarian abundance,
- surface productivity,
- trade wind,
- Antarctic bottom water,
- tropical Eastern Pacific,
- Late Quaternary

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References(43)

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