Astrochronology of the Paleocene-Eocene Thermal Maximum on the Atlantic Coastal Plain.

Astrochronology of the Paleocene-Eocene Thermal Maximum on the Atlantic Coastal Plain.
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DOI:
10.1038/s41467-022-33390-x
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发表时间:
2022-09-24
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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古新世-始新世极热期(PETM,~56Ma)的年代仍然存在争议,阻碍了对该事件可能的触发机制的全面了解。在这里,我们介绍了马里兰州霍华德地区大西洋中部沿海平原古陆架环境中 PETM 碳同位素偏移的天文年代学。对钙含量和磁化率变化的统计评估表明,涉及天文强迫,PETM 的爆发持续了大约 6 kyr。天文年代学和地球系统模型表明,PETM的爆发发生在偏心率最大期间进动的极端时期,因此有利于高温,表明天文强迫可能在触发该事件中发挥了作用。古陆架上的钙含量数据以及其他海洋记录都支持这样的观点,即在 PETM 期间全球海洋酸化之后碳酸盐饱和度超调。马里兰州核心的天文年代学表明,古新世-始新世最热期 (PETM) 变暖的开始持续了大约 6000 年。这些数据更符合天文强迫,而不是 PETM 的外星触发因素。
The chronology of the Paleocene-Eocene Thermal Maximum (PETM, ~56 Ma) remains disputed, hampering complete understanding of the possible trigger mechanisms of this event. Here we present an astrochronology for the PETM carbon isotope excursion from Howards Tract, Maryland a paleoshelf environment, on the mid-Atlantic Coastal Plain. Statistical evaluation of variations in calcium content and magnetic susceptibility indicates astronomical forcing was involved and the PETM onset lasted about 6 kyr. The astrochronology and Earth system modeling suggest that the PETM onset occurred at an extreme in precession during a maximum in eccentricity, thus favoring high temperatures, indicating that astronomical forcing could have played a role in triggering the event. Ca content data on the paleo-shelf, along with other marine records, support the notion that a carbonate saturation overshoot followed global ocean acidification during the PETM. Astrochronology of a core in Maryland suggests that the onset of the Paleocene-Eocene Thermal Maximum (PETM) warming lasted about 6 thousand years. These data are more consistent with astronomical forcing than an extraterrestial trigger for the PETM.
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