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Thermoluminescence change of carbonate ooze from Ninetyeast Eidge of Indian Ocean near equator and its relation to glacial cycles

LIU Hai-Sheng~1, FANG Nian-Qiao~2, WANG Nan-Ping~2, HOU Sheng-Li~2, HU Chao-Yong~3, MA Wan-Yun~1, CHEN Die-Yan~1 ucation, China,Department of Physics, Tsinghua University, Beijing; 2.China University of Geosciences, Beijing; 3.China University of Geosciences, Wuhan)  
Piston core MD81349 from the Ninetyeast Ridge of the Indian Ocean near the equator records more information of environmental changes during the past 300 ka. The thermoluminescence (TL) (technique) has been used to analyze bulk samples and foraminiferal shells of the core. The TL fluctuations that can well correlate with the oxygen isotope curve was obtained for the first time. Experimental data suggest that the high and low NTL intensities may indicate the interglacial and glacial stages, respectively. Analysis shows that the NTL intensities is not related to the content of calcium carbonate; in the case of the essentially consistent composition of pelagic globigerina oozes, however, the variation is most likely to be controlled by the crystal types, lattice defect forms and impurity ions in the crystal lattice of (foraminiferal) shells formed under different climatic conditions.
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