浮遊性有孔虫骨格のMg/Ca古水温計を用いた北西太平洋の高精度古環境復元にむけて(<特集>後期新生代の環境指標としての微古生物学と古海洋学の進展)
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Reconstruction of paleo-sea surface temperature (SST) and vertical water structure made great impacts on understanding the climatic systems in each oceans during the Neogene epoch. The Magnesium/Calcium ratio (Mg/Ca) in planktic foraminifers reflects the calcified temperature and was identified as a reliable tracer of SST. In this decade, this relatively new paleotemperature proxy has been refined by precise geochemical analytical techniques, and applied for the geological materials. Despite of such utilities in paleoceanography, it has been recognized that Mg/Ca incorporation in the shells of planktic foraminifers is altered by several factors: 1) carbonate dissolution, 2) diagenetic overprints after deposition, 3) heterogenetic distributions of Mg in the foraminiferal calcite, and 4) biologic factors in foraminiferal microenvironments. These factors are possibly impediment to apply the Mg/Ca ratio to high resolution paleoceanographic reconstruction studies. To explain these aspects of matter, I propose some approaches from geochemical and paleontological viewpoints to establish reliable calibration equation in the Northwestern Pacific, where there are no available calibration equations for paleothermometry at this time. The most fundamental thing is making consensuses for integration of geochemical procedures including chemical cleaning of foraminiferal shells and global standardization of analytical quality control. The second important thing is further studies of living planktic foraminiferal ecologies using plankton tows and sediment traps. Mutual efforts between these studies should give rise to establish reliable calibration equation in the Northwestern Pacific.
- 2009-10-16
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関連論文
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