Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382
Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382
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中新世将呈现斯科舍海和南极冰盖动力学的海洋学变化：IODP第382次远征后修订的地震地层学的见解
DOI：
10.1016/j.epsl.2020.116657
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发表时间：
2021
影响因子：
5.3
通讯作者：
Pérez L
中科院分区：
文献类型：
--
作者：
Pérez L
斯科舍海和德雷克海峡是理解现代海洋环流模式的发展及其对冰盖生长和衰变的影响的关键。南斯科舍海盆的沉积记录记录了始新世以来的区域构造、海洋和气候演化。然而，由于缺乏准确的年龄估计，阻碍了重建历史的校准。斯科舍海的上部沉积记录于2019年在国际海洋发现计划（IODP）第382次考察期间首次进行科学钻探，分别在Dove和Pirie盆地恢复了海底以下643米和676米的沉积物。在这里，我们报告新获得的高分辨率的物理性质数据和第一个准确的年龄限制的地震序列的上部沉积记录的斯科舍海晚中新世。钻探记录包含四个全盆地反射层-- Reflector-c、-B、-a和-a'，先前估计它们的年龄分别为12.6 Ma、16.4 Ma、13.8 Ma和12.6 Ma。然而，通过将我们新的斯科舍海洋年龄模型外推到以前对更广泛地区的形态结构和地震地层分析，我们发现，所钻的四个不连续面比以前认为的要年轻得多。Reflector-c实际上形成于8.4Ma之前，Reflector-b实际上形成于4.5/3.7Ma，Reflector-a实际上形成于4.7Ma，Reflector-a'实际上形成于4.4Ma。我们更新的年龄模型，这些不连续的区域构造，海洋和冰冻圈事件的相关性有重大影响。结果表明，晚中新世以来，南极底层水向北方纬度的流出控制了南极绕极流。南极冰盖随后的变化影响了与上新世早期、中更新世和海洋同位素阶段11期间主要全球气候变化有关的海洋环流模式。
Scotia Sea and the Drake Passage is key towards understanding the development of modern oceanic circulation patterns and their implications for ice sheet growth and decay. The sedimentary record of the southern Scotia Sea basins documents the regional tectonic, oceanographic and climatic evolution since the Eocene. However, a lack of accurate age estimations has prevented the calibration of the reconstructed history. The upper sedimentary record of the Scotia Sea was scientifically drilled for the first time in 2019 during International Ocean Discovery Program (IODP) Expedition 382, recovering sediments down to ∼643 and 676 m below sea floor in the Dove and Pirie basins respectively. Here, we report newly acquired high resolution physical properties data and the first accurate age constraints for the seismic sequences of the upper sedimentary record of the Scotia Sea to the late Miocene. The drilled record contains four basin-wide reflectors – Reflector-c, -b, -a and -a' previously estimated to be ∼12.6 Ma, ∼6.4 Ma, ∼3.8 Ma and ∼2.6 Ma, respectively. By extrapolating our new Scotia Sea age model to previous morpho-structural and seismic-stratigraphic analyses of the wider region we found, however, that the four discontinuities drilled are much younger than previously thought. Reflector-c actually formed before 8.4 Ma, Reflector-b at ∼4.5/3.7 Ma, Reflector-a at ∼1.7 Ma, and Reflector-a' at ∼0.4 Ma. Our updated age model of these discontinuities has major implications for their correlation with regional tectonic, oceanographic and cryospheric events. According to our results, the outflow of Antarctic Bottom Water to northern latitudes controlled the Antarctic Circumpolar Current flow from late Miocene. Subsequent variability of the Antarctic ice sheets has influenced the oceanic circulation pattern linked to major global climatic changes during early Pliocene, Mid-Pleistocene and the Marine Isotope Stage 11.
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2007
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2014
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