氧同位素第6期北印度洋的一次重大古海洋学事件

方念乔; 丁旋; 胡超涌; 宋成兵; 张振芳

Volume 29 Issue 2

Mar. 2004

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Article Navigation > Earth Science > 2004 > 29(2): 127-133

FANG Nian-qiao, DING Xuan, HU Chao-yong, SONG Cheng-bing, ZHANG Zhen-fang, 2004. A Significant Paleoceanographic Event Taking Place in Northeastern Indian Ocean during Oxygen Isotope Stage 6. Earth Science, 29(2): 127-133.

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A Significant Paleoceanographic Event Taking Place in Northeastern Indian Ocean during Oxygen Isotope Stage 6

1.
Institute of Marine Geology and Geophysics, China University of Geosciences, Beijing 100083, China
2.
Development and Research Center, China Geological Survey, BeOing 100037, China

Received Date: 2003-12-03
Publish Date: 2004-03-25

Abstract

Abstract

The pelagic sedimentary records conserved on the equatorial Ninetyeast Ridge have mirrored a significant event dating from the early oxygen isotope stage 6(167-160 ka). We call it the"great event of worsened ecologic environment" because the strongest indications of the event among all proxies are from an exceptional change of assemblage and flux of planktonic foraminifera. The event is characterized by a high development of the eurytropic species Globigerinita glutinata, an unusual promotion of the cool-water species Neogloboquadrina pachyderma and Globigerina bulloides, an evident reduction of the major common species and a large downfall of the foraminifera sedimentary quantity. Referring to the otherindications and the materials from the neighboring areas, we believe that the essential factor resulting in the eventis "ultraintense" south Asian winter monsoon that leads to the lower temperature of superficialwater and upwelling of infertile deeperwater. In general, the wintermonsoon ismuchweaker than summermonsoon for affecting the environmentof the study area in the system of the south Asian monsoon. Its periodic extraordinary intensification seems to relate constantly with the violent uplift of the Tibetan plateau. We guess thatthe"great event of worsened ecologic environment" revealed in this paperis very probably the resultof the last extensive tectonic elevation of the plateau.
- oxygen isotope stage 6,
- paleoceanographic event,
- deterioration of ecologic environment,
- south Asian winter monsoon,
- uplift of the Tibetan plateau

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References

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