Abstract During the Last Glacial Cycle (last ~130 kyr) climatically induced changes in the ocean dynamics affected the tracemaker habitat in the Alboran Sea Basin (westernmost Mediterranean), as observed in sediment records from ODP Leg 161 Sites 976 and 977. The trace fossil assemblage present is assigned to the Zoophycos ichnofacies and is of low/moderate diversity and comprises common Planolites, Chondrites and Thalassinoides, with occasional Scolicia and Zoophycos. Ichnodiversity, size of biogenic structures and percentage of bioturbational sedimentary structures clearly correlate. Fluctuations in ichnological features evidence a well-developed short-term cyclic pattern that could be related to environmental changes such as export production and oxygenation at the seafloor. The percentage of bioturbational sedimentary structures correlates well with sea-surface temperature (SST) records obtained for the Alboran Sea and Gulf of Lions, as well as with the δ18O profiles of Greenland ice cores. Correlation is seen for both the long-term (over the Last Glacial Cycle) and short-term changes, the latter comprising climate oscillations such as Heinrich Events, Younger Dryas, and periods of organic-rich layer deposition. Ichnological data also allow for a reconstruction of climatically induced changes in the ocean dynamics, which have a major incidence in the Western Mediterranean Deep Water that, in turn, affects deep-sea environmental conditions.

中文翻译：

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地质学分析作为评估最后一次冰期循环中地中海最西端深海环流的工具

摘要 如在 ODP Leg 161 Sites 976 和 977 的沉积物记录中所观察到的，在末次冰期循环期间（末次约 130 kyr）气候引起的海洋动力学变化影响了奥尔博兰海盆地（地中海最西端）的示踪剂栖息地。存在的组合被指定为 Zoophycos ichnfacies，具有低/中等多样性，包括常见的 Planolites、Condrites 和 Thalassinoides，偶尔有 Scolicia 和 Zoophycos。物种多样性、生物结构的大小和生物扰动沉积结构的百分比明显相关。地质特征的波动证明了一种完善的短期循环模式，这可能与环境变化有关，例如出口生产和海底的氧化。生物扰动沉积结构的百分比与在奥尔博兰海和狮子湾获得的海面温度 (SST) 记录以及格陵兰冰芯的 δ18O 剖面密切相关。长期（末次冰期周期）和短期变化都存在相关性，后者包括气候振荡，如海因里希事件、新仙女木和富含有机物层沉积时期。Ichnological 数据还允许重建气候引起的海洋动力学变化，这在西地中海深水区有重大影响，进而影响深海环境条件。长期（末次冰期周期）和短期变化都存在相关性，后者包括气候振荡，如海因里希事件、新仙女木和富含有机物层沉积时期。Ichnological 数据还允许重建气候引起的海洋动力学变化，这在西地中海深水区有重大影响，进而影响深海环境条件。长期（末次冰期周期）和短期变化都存在相关性，后者包括气候振荡，如海因里希事件、新仙女木和富含有机物层沉积时期。Ichnological 数据还允许重建气候引起的海洋动力学变化，这在西地中海深水区有重大影响，进而影响深海环境条件。