OXYGEN ISOTOPE RECORDS OF CALCAREOUS NANNOFOSSILS SINCE MIS 6 FROM THE MARGINAL AREA OF WEST PACIFIC

ZHAO Jingtao; LI Jun; CHANG Fengming; LI Tiegang

doi:10.3724/SP.J.1140.2010.05075

2010 Vol. 30, No. 5

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Article navigation > Marine Geology & Quaternary Geology > 2010 > 30(5): 75-82

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ZHAO Jingtao, LI Jun, CHANG Fengming, LI Tiegang. OXYGEN ISOTOPE RECORDS OF CALCAREOUS NANNOFOSSILS SINCE MIS 6 FROM THE MARGINAL AREA OF WEST PACIFIC[J]. Marine Geology & Quaternary Geology, 2010, 30(5): 75-82. doi: 10.3724/SP.J.1140.2010.05075

Citation:

ZHAO Jingtao, LI Jun, CHANG Fengming, LI Tiegang. OXYGEN ISOTOPE RECORDS OF CALCAREOUS NANNOFOSSILS SINCE MIS 6 FROM THE MARGINAL AREA OF WEST PACIFIC[J]. Marine Geology & Quaternary Geology, 2010, 30(5): 75-82. doi: 10.3724/SP.J.1140.2010.05075

OXYGEN ISOTOPE RECORDS OF CALCAREOUS NANNOFOSSILS SINCE MIS 6 FROM THE MARGINAL AREA OF WEST PACIFIC

1 Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Key Laboratory of Marine Hydrocarbon Resource and Environmental Geology, Ministry of Land and Resources, Qingdao 266071, China;
3 Qingdao Institute of Marine Geology, Ministry of Land and Natural Resources, Qingdao 266071, China

Received Date: 11 May 2010

Revised Date: 14 July 2010

Abstract

Abstract

Three piston cores, WP7, Ph05-5 and Z14-6,recovered from the marginal area of the West Pacific were analyzed for their δ18O variations of calcareous nannofossils. The nannofossil δ18O values of all the three cores showed apparent glacial-interglacial cycles. The δ18O values were generally lower during interglacials than glacials since MIS 6,corresponding to lower sea surface temperatures (SST) during glacial stage,except for the penultimate glacial cycle in core Z14-6. The average δ18O values of MIS 6-1 show an increasing trend from core WP7 to Ph05-5 and Z14-6, that is explained by the gradually decreasing SST at these locations. At a single location, however,the average δ18O values of planktonic foraminifera Neogloboquadrina dutertrei were higher than those of nannofossils, reflecting different water temperatures at their living water depth. These differences show a decreasing trend from core WP7 to Ph05-5, and Z14-6,that can be explained by increased disturbance in upper water. The δ18O difference between nannofossils and N. dutertrei, as well as the downcore variations in the percentage of Florisphaera profunda in core WP7 and Ph05-5 implies that the thermocline of the coring regions of Western Pacific Warm Pool and the Western Philippine Sea was deeper during interglacials than that in glacials since MIS 6.
- marginal area of the West Pacific /
- calcareous nannofossils /
- oxygen isotope /
- since MIS 6

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References

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