远洋沉积岩心天然热释光剖面的异常特征与古气候变化的关系

THERMOLUMINESCENCE ANOMALY OF A PELAGIC CORE AND ITS RELATION TO PALEOCLIMATE CHANGE

摘要: 海洋沉积物天然热释光强度的变化特征与冰川旋回的交替、海平面变化等存在良好的对应关系,从而揭示出热释光的强度可能成为古海洋气候演变的新的替代性指标。旨在通过对北印度洋东经90°海岭ODP758岩心沉积物天然热释光强度与δ¹⁸O、粗粒屑(>150 μm)含量、CaCO₃含量等替代性指标的对比,进行相关分析,探索和开发新的替代指标。从构造的尺度上来研究热释光特征变化和环境的关系,并解释热释光变化特征及其控制因素。通过对比发现沉积物的热释光强度与δ¹⁸O和CaCO₃含量有着很好的正相关性,粗粒屑(>150 μm)含量呈负相关性。

Abstract: In the recent research, it is found that thermoluminescence(TL) intensity may have a good relationship with glacial cycles and sea level changs.The TL intensity may become a new proxy of the paleoclimatic evolution. We compared the TL of the oceanic sediments of the core ODP 758 from the Northeastern Indian Ocean with the content of coarse fraction, the content of CaCO₃ and δ¹⁸O.we found a positice correlation between TL intensity and the content of CaCO₃ and δ¹⁸O, a negative correlation between TL intensity and the content of Coarse fraction (>150 μm).