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首页> 外文期刊>Paleoceanography >A complete high-resolution Paleocene benthic stable isotope record for the central Pacific (ODP Site 1209)
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A complete high-resolution Paleocene benthic stable isotope record for the central Pacific (ODP Site 1209)

机译:完整的中太平洋高分辨率新世底栖稳定同位素记录(ODP站点1209)

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摘要

We have compiled the first stratigraphically continuous high-resolution benthic foraminiferal stable isotope record for the Paleocene from a single site utilizing cores recovered at Pacific ODP Site 1209. The long-term trend in the benthic isotope record suggests a close coupling of volcanic CO_2 input and deep-sea warming. Over the short-term the record is characterized by slow excursions with a pronounced periodic beat related to the short (100 kyr) and long (405 kyr) eccentricity cycle. The phase relationship between the benthic isotope record and eccentricity is similar to patterns documented for the Oligocene and Miocene confirming the role of orbital forcing as the pace maker for paleoclimatic variability on Milankovitch time scales. In addition, the record documents an unusual transient warming of 2°C coeval with a 0.6 carbon isotope excursion and a decrease in carbonate content at 61.75 Ma. This event, which bears some resemblance to Eocene hyperthermals, marks the onset of a long-term decline in σ13C. The timing indicates it might be related to the initiation of volcanism along Greenland margin.
机译:我们利用太平洋ODP站点1209回收的岩心,从单个站点汇编了古新世的第一个地层连续高分辨率底栖有孔虫稳定同位素记录。底栖同位素记录的长期趋势表明,火山CO_2​​输入与深海变暖。在短期内,记录的特点是缓慢的偏移,具有明显的周期性节拍,与短(100 kyr)和长(405 kyr)偏心周期有关。底栖同位素记录与偏心率之间的相位关系类似于渐新世和中新世记录的模式,这证实了轨道强迫是米兰科维奇时标上古气候变化起搏器的作用。此外,该记录还记录了一个非同寻常的瞬时升温,即伴随着0.6的碳同位素偏移和61.75 Ma的碳酸盐含量降低而出现的2°C的短暂瞬时升温。该事件与始新世高温相似,标志着σ13C长期下降的开始。时间表明它可能与格陵兰边缘的火山爆发有关。

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