Differential response at the seafloor during Palaeocene and Eocene ocean warming events at Walvis Ridge, Atlantic Ocean (ODP Site 1262)

Differential response at the seafloor during Palaeocene and Eocene ocean warming events at Walvis Ridge, Atlantic Ocean (ODP Site 1262)
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大西洋沃尔维斯海脊古新世和始新世海洋变暖事件期间海底的差异响应(ODP 站点 1262)

DOI:
10.1111/ter.12250
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发表时间:
2017
期刊:
影响因子:
2.4
通讯作者:
Speijer
Speijer
中科院分区:
地球科学3区
文献类型:
--
作者:
Deprez;Bornemann;Speijer

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最新的大年事件(Lde,约62.1 Ma)是古近纪早期的一次过热或瞬变(<200 Ma)海洋变暖事件。我们提出了第一个深海底栖有孔虫动物群记录,以研究深海生物变化,并结合Walvis Ridge站点1262(大西洋)的新的底栖动物(Nuttallides Truempyi)稳定同位素数据来评估LDE是否受类似于始新世早期较小的高温作用的控制。δ~(13)C和δ~(18)O双负漂移的间距和δ~(18)O-δ~(13)C回归的斜率是可比的,强烈表明偏心率极大值的轨道控制和起搏相似,以及相当均匀的碳库。然而,与始新世早期的高温相比,LDE表现出显著的底栖有孔虫动物群的稳定性。这种底栖生物反应的缺乏可能与没有阈值相关的环流变化或对深海温度上升的更好预适应有关,因为与始新世早期变暖相反,LDE叠加在冷却趋势上。
The Latest Danian Event (LDE,c. 62.1 Ma) is an early Palaeogene hyperthermal or transient (<200 ka) ocean warming event. We present the first deep‐sea benthic foraminiferal faunal record to study deep‐sea biotic changes together with new benthic (Nuttallides truempyi) stable isotope data from Walvis Ridge Site 1262 (Atlantic Ocean) to evaluate whether the LDE was controlled by similar processes as the minor early Eocene hyperthermals. The spacing of the double negative δ13C and δ18O excursion and the slope of the δ18O–δ13C regression are comparable, strongly suggesting a similar orbital control and pacing of eccentricity maxima as well as a rather homogeneous carbon pool. However, in contrast to early Eocene hyperthermals, the LDE exhibits a remarkable stability of the benthic foraminiferal fauna. This lack of benthic response could be related to the absence of threshold‐related circulation changes or better pre‐adaptation to elevated deep‐sea temperatures, as the LDE was superimposed on a cooling trend, in contrast to early Eocene warming.
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