Based on the data of oxygen isotope, micro-paleontology and paleomagnetism, we set up the detailed chronology of Core 17957-2 from the southern South China Sea and discuss the change of carbonate dissolution over the ...Based on the data of oxygen isotope, micro-paleontology and paleomagnetism, we set up the detailed chronology of Core 17957-2 from the southern South China Sea and discuss the change of carbonate dissolution over the last 800 ka. Down-core variation of carbonate content records the 'Pacific-type' cycle of higher glacial values and lower interglacial values, though the core lies above the modern lysocline. Carbonate dissolution indices indicate that several severe dissolution of CaCO3 happened during the transition from interglacial to glacial stages. Spectral analyses of these indices show that the carbonate dissolution periodicities are mainly made up of 500 ka and 100 ka. Compared with the cycles of carbonate dissolution of the Indian Ocean, the long-term (500-ka) periodicity reflects the characteristic of the deep-water circulation of the oceans.展开更多
基金This work was supported by the National Natural Science Foundation of China (Grant No. 49999560) the Innovative Foundation of the Chinese Academy of Sciences, and Laboratory of Palaeobiology & Stratigraphy NIGPAS (Grant No. 013114).
文摘Based on the data of oxygen isotope, micro-paleontology and paleomagnetism, we set up the detailed chronology of Core 17957-2 from the southern South China Sea and discuss the change of carbonate dissolution over the last 800 ka. Down-core variation of carbonate content records the 'Pacific-type' cycle of higher glacial values and lower interglacial values, though the core lies above the modern lysocline. Carbonate dissolution indices indicate that several severe dissolution of CaCO3 happened during the transition from interglacial to glacial stages. Spectral analyses of these indices show that the carbonate dissolution periodicities are mainly made up of 500 ka and 100 ka. Compared with the cycles of carbonate dissolution of the Indian Ocean, the long-term (500-ka) periodicity reflects the characteristic of the deep-water circulation of the oceans.
