Direct U/Th Dating of the Marine Oxygen Isotope Record

OCE-9632215 该项目将开发一种新的技术（U-Th），用于测定海洋文石沉积物的年代，超过14 C所能达到的范围。 文石的初步结果产生的年龄阶段5和7与轨道调整的18 O规模。 该项目将通过尝试在其他地方复制这些结果来测试这些结果，将日期延长到第9阶段，并提高精度。 对深海碳酸盐岩进行直接和独立的年龄控制，对于海洋在全球气候变化中的作用，特别是区域联系和反馈等方面的作用的模型至关重要。

OCE-9632215 This project will develop a new technique (U-Th) for dating marine aragonite sediments beyond the range achievable by 14C. Preliminary results on aragonite have produced ages for Stages 5 and 7 in agreement with the orbitally-tuned 18O scale. The project will test these results by attempting to duplicate them elsewhere, extend the dating to Stage 9, and improve the precision. Direct and independent age control on deep-sea carbonates is essential for models concerning the ocean's role in global climate change, especially such aspects as regional linkages and feedbacks.