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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Sea-level during the penultimate interglacial period based on a submerged stalagmite from Argentarola Cave (Italy)
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Sea-level during the penultimate interglacial period based on a submerged stalagmite from Argentarola Cave (Italy)

机译：倒数第二个冰期间的海平面，来自阿根廷Argentarola Cave的水下石笋

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摘要

Accurate constraints are presented for the absolute age, duration and sea-level for the highstand corresponding to marine isotope stage (MIS) 7.1. Our work is based on a stalagmite collected in a currently submerged cave from Italy (Argentarola Cave). Flooding of this coastal cave is clearly marked within the stalagmite by a thick marine overgrowth of serpulid worms. Precise uranium-thorium (U-Th) ages measured by thermal ionization mass spectrometry suggest that the stalagmite growth varied in phase with climate during MIS 7.2 and MIS 6, the penultimate glacial period. In addition, the period of marine transgression is bracketed between 202 and 190 kyr BP, defining a MIS 7.1 duration of 11 ± 2 kyr. Comparison with previous studies provides a new constraint on the sea-level during MIS 7.1 highstand is in full agreement with the SPECMAP chronology which contrasts with the growing body of evidence showing a significant phase difference for MIS 5.5. A tempting conclusion is that second order sea-level highstands such as MIS 7.1 may be purely driven by astronomical changes, in contrast with major terminations such as Termination II. Atmospheric CO_2 levels may partly explain this contrast since the two sea-level transitions, (MIS 7.2-7.1 and MIS 6-5.5) are characterized by very different CO_2 rises (20 vs 100 ppm).
机译：针对与海洋同位素阶段（MIS）7.1相对应的高潮，对绝对年龄，持续时间和海平面提出了准确的限制条件。我们的工作基于从意大利一个目前被淹没的洞穴（Argentarola洞穴）中收集的石笋。石笋体内厚厚的海藻丝虫蠕虫清楚地标志着石笋中有这个沿海洞穴的洪水。通过热电离质谱法测量的精确铀-（（U-Th）年龄表明，在MIS 7.2和MIS 6（倒数第二个冰期）期间，石笋的生长与气候呈相位变化。此外，海侵时期在202至190 kyr BP之间，定义为MIS 7.1持续时间为11±2 kyr。与先前研究的比较为MIS 7.1高位期间的海平面提供了新的约束条件，这与SPECMAP年表完全吻合，这与越来越多的证据表明MIS 5.5的相位差显着相反。一个诱人的结论是，与诸如Termination II之类的主要航站楼相比，诸如MIS 7.1之类的二阶海平面高空可能纯粹是由天文学变化驱动的。大气中CO_2的水平可能部分解释了这种差异，因为两个海平面转换（MIS 7.2-7.1和M​​IS 6-5.5）的特征在于CO_2的上升非常不同（20 vs 100 ppm）。

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