Extreme warming of tropical waters during the Paleocene-Eocene Thermal Maximum
Extreme warming of tropical waters during the Paleocene-Eocene Thermal Maximum
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DOI：
10.1130/g35637.1
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发表时间：
2014-09-01
期刊：
影响因子：
5.8
通讯作者：
Foster, G. L.
中科院分区：
文献类型：
--
作者：
Aze, T.;Pearson, P. N.;Foster, G. L.
古新世-始新世最热期（PETM），约56Ma是一次重大的全球环境扰动，归因于大气中温室气体浓度的迅速上升。来自 PETM 的热带海面温度（SST）的地球化学记录很少，并且通常受到沉积后成岩作用的影响。为了解决这个问题，我们分析了来自坦桑尼亚 PETM（类似于南纬 19 度古纬度）的保存异常完好的浮游有孔虫单个样本的氧同位素比（δ O-18），得出的 δ O-18 极低，在 PETM 期间低至 3 摄氏度，可能超过 40 摄氏度。坦桑尼亚 PETM 的大部分地区不存在钙质浮游生物。记录；极端的环境变化可能暂时导致有孔虫排斥。
The Paleocene-Eocene Thermal Maximum (PETM), ca. 56 Ma, was a major global environmental perturbation attributed to a rapid rise in the concentration of greenhouse gases in the atmosphere. Geochemical records of tropical sea-surface temperatures (SSTs) from the PETM are rare and are typically affected by post-depositional diagenesis. To circumvent this issue, we have analyzed oxygen isotope ratios (delta O-18) of single specimens of exceptionally well-preserved planktonic foraminifera from the PETM in Tanzania (similar to 19 degrees S paleolatitude), which yield extremely low delta O-18, down to 3 degrees C during the PETM and may have exceeded 40 degrees C. Calcareous plankton are absent from a large part of the Tanzania PETM record; extreme environmental change may have temporarily caused foraminiferal exclusion.