Controls on Late Quaternary sedimentation of the South Tasman Rise
Controls on Late Quaternary sedimentation of the South Tasman Rise
复制标题
南塔斯曼海隆晚第四纪沉积的控制
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
E. Sikes
中科院分区：
文献类型：
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作者：
R. Connell;E. Sikes
南塔斯曼海隆是一个深约1000-3000米的海底大陆高原，位于塔斯马尼亚以南的南大洋，由3000多米深的马鞍与塔斯马尼亚分开。它的古海洋学意义在于它位于亚热带辐合带和极锋之间，这些海洋学特征的纬向迁移应记录在隆起处沉积的钙质软泥中。从南塔斯曼隆起收集的晚第四纪沉积物岩心记录了气候和洋流控制的沉积变化。碳酸盐浓度的加速器质谱14C测年表明，岩心顶部的碳酸盐最大值是全新世，岩心下部的最小值是连续的冰期。在冰期，碳酸盐的百分比减少，而碎屑矿物的百分比（陆源输入）增加。沉积物中表达的气候相关特征的大小是一个函数，既接近陆地，也接近陆地。
The South Tasman Rise is a submarine continental plateau of about 1000–3000 m depth, in the Southern Ocean south of and separated from Tasmania by a saddle more than 3000 m deep. Its palaeoceanographic importance is that it lies between the subtropical convergence and the polar front and that latitudinal migration of these oceanographic features should be recorded in the calcareous oozes deposited on the rise. Late Quaternary sediment cores collected from the South Tasman Rise record climatically and current‐controlled changes in sedimentation. Accelerator mass spectrometry 14C dating of down‐core variations in the carbonate concentration demonstrates that the core‐top carbonate maxima are Holocene and down‐core minima are successive glacial intervals. During glaciations the percentage of carbonate decreases, whereas the percentage of detrital minerals (terrestrial input) increases. The magnitude of climatically related signatures expressed in the sediments is a function both of proximity to terrestrial i...