FLUCTUATIONS OF CARBONATE CONTENT AND ITS CONTROL FACTORS IN THE WESTERN PHILIPPINE SEA FOR THE LAST 150KA

SUN Hanjie; LI Tiegang; SUN Rongtao; XU Zhaokai; CHANG Fengming

doi:10.3724/SP.J.1140.2012.04149

2012 Vol. 32, No. 4

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Article navigation > Marine Geology & Quaternary Geology > 2012 > 32(4): 149-156

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SUN Hanjie, LI Tiegang, SUN Rongtao, XU Zhaokai, CHANG Fengming. FLUCTUATIONS OF CARBONATE CONTENT AND ITS CONTROL FACTORS IN THE WESTERN PHILIPPINE SEA FOR THE LAST 150KA[J]. Marine Geology & Quaternary Geology, 2012, 32(4): 149-156. doi: 10.3724/SP.J.1140.2012.04149

Citation:

SUN Hanjie, LI Tiegang, SUN Rongtao, XU Zhaokai, CHANG Fengming. FLUCTUATIONS OF CARBONATE CONTENT AND ITS CONTROL FACTORS IN THE WESTERN PHILIPPINE SEA FOR THE LAST 150KA[J]. Marine Geology & Quaternary Geology, 2012, 32(4): 149-156. doi: 10.3724/SP.J.1140.2012.04149

FLUCTUATIONS OF CARBONATE CONTENT AND ITS CONTROL FACTORS IN THE WESTERN PHILIPPINE SEA FOR THE LAST 150KA

1 Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071;
2 School of Resource & Environment Engineering Shandong University of Technology, Zibo, 255049

Received Date: 06 July 2012

Revised Date: 18 July 2012

Abstract

Abstract

The carbonate content of bulk samples was analyzed for the sediment cores of MD06-3050 taken from Benham Rise, western Philippine Sea. The fluctuations in carbonate content for the past 150 ka show a general pattern of the "Atlantic type" of carbonate cycle, i.e. lower in glacials and higher in interglacials. Both sediment coarse fractions and foraminifera fragment ratios were used as indicators of the dissolution intensity of carbonate, and show a similar pattern to carbonate content change since 150 ka. TOC content in bulk samples was also measured, which showed a good consistency with carbonate content. In contrast, the primary productivities derived from the relative abundance of coccolith species F.profunda, yield significantly different trend. By comparison of above proxies, it is inferred that there may be multiple factors controlling the variation in carbonate content, but dissolution is certainly the most important. This dissolution pattern maybe related to the Corg/CaCO3 rain ratio and the ventilation of deep water.
- carbonate /
- 150 ka /
- primary productivity /
- dissolution /
- western Philippine Sea

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References

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