Marine Calcareous Biological Ooze Thermoluminescence and Its Application for Paleoclimate Change since the Middle Pleistocene

• Published in: Water
• Main Authors: Ping Zhang, Haisheng Liu, Shengli Hou, Nanping Wang, Nianqiao Fang
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2023
• Subjects: Indian Ocean; North Atlantic Ocean; thermoluminescence; calcareous biological ooze; paleoclimate; Hydraulic engineering; TC1-978; Water supply for domestic and industrial purposes; TD201-500; Indian; North Atlantic
• Online Access: https://doi.org/10.3390/w15142618; https://doaj.org/article/84005c57e8974968ac4dc04d85dc1bfe

Natural thermoluminescence (TL) from the core of MD81349 marine calcareous biological ooze samples in the Ninetyeast Ridge of the equatorial northeast Indian Ocean and from the core of IODP306-U1312B in the high latitudes of the North Atlantic Ocean was studied. The spurious TL intensity of 395 °C at its peak is dose independent when the heating rate is 6 °C/s in a nitrogen atmosphere. TL signals have exhibited a significant correlation with the marine isotope stages (MIS) in the two oceans since the mid-Pleistocene era. High TL intensity corresponds to a negative δ 18 O in the interglacial stages, and low TL intensity corresponds to a positive δ 18 O in the glacial stages. The TL of both cores from the two oceans reveal that global climate has experienced eight cold and warm cycles since the mid-Pleistocene era. In this study, a single-frequency spectrum analysis of the MD81349 and U1312B TL cores in the last 300 ka is performed. Near the equator of the northeast Indian Ocean, the short cycles of 38 ka and 5 ka are more significant, while the cycle of 8 ka is more significant in the North Atlantic Ocean. In addition, a correlation analysis shows that the TL has a significant positive correlation with the trace element 135 Ba and a significant negative correlation with 47 Ti. The impurity ions (e.g., Ba 2+ , Mn 2+ and Ti 2+ ) doped in carbonate act as activators and suppressants, respectively. A time series of the TL of the calcareous biological ooze tests provide an important record of climate change. The source of the TL signal is also discussed.