布莱克鼻(西北大西洋)上晚始新世(普里阿本纪)碳氧同位素转变过程中的微古生物瞬时更替

IF 4.1 3区 地球科学 Q1 PALEONTOLOGY
Julia de Entrambasaguas, T. Westerhold, H. L. Jones, L. Alegret
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引用次数: 0

摘要

摘要湾流是将暖水输送到北大西洋的西边界洋流,作为大西洋经向翻转环流(AMOC)的一部分,在区域和全球范围内的气候调节和海洋学稳定性方面发挥着关键作用。有证据表明,自中生代以来就存在祖先湾流,它在新生代时期曾多次改变其流向。在本研究中,我们重点研究了来自布莱克鼻(亚热带北大西洋)1053 号大洋钻探计划站点的上始新世(普里阿本纪,约 36 Ma)。大体积碳和氧稳定同位素,以及底栖有孔虫和钙质化石组合,提供了对通过水柱到海底影响该地区的古海洋学变化的综合评估。微古生物组合表明,表层海洋分层和海底营养供应的变化与碳和氧同位素的成对负偏移以及研究区段较高处恢复到本底条件同时发生。这些短暂的变化与原湾流及其相关漩涡的纵向位移相吻合。我们的研究结果建立在以往工作的基础上,支持将布莱克鼻地区的古海洋学变化与中新世晚期原湾流的位移联系起来的假说。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transient micropaleontological turnover across a late Eocene (Priabonian) carbon and oxygen isotope shift on Blake Nose (NW Atlantic)
Abstract. The Gulf Stream, a western boundary current transporting warm water into the North Atlantic, plays a key role in climate regulation and oceanographic stability at a regional and global scale as part of the Atlantic Meridional Overturning Circulation (AMOC). Evidence suggests that an ancestral Gulf Stream has existed since the Mesozoic, and it has altered its course repeatedly over Cenozoic times. In this study, we focus on the upper Eocene (Priabonian, ca. 36 Ma) from Ocean Drilling Program Site 1053 on Blake Nose (subtropical North Atlantic). Bulk carbon and oxygen stable isotopes, as well as benthic foraminiferal and calcareous nannofossil assemblages, provide an integrated assessment of the palaeoceanographic changes impacting the area through the water column to the seafloor. Micropaleontological assemblages suggest changes in surface ocean stratification and nutrient supply to the seafloor coeval with a paired negative carbon and oxygen isotope excursion and the return to background conditions higher up in the study section. These transitory changes are compatible with the longitudinal displacement of the proto-Gulf Stream and its related eddies. Our results build on previous work and support the hypothesis that links palaeoceanographic changes in the Blake Nose area with shifts in the proto-Gulf Stream during the middle and late Eocene.
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来源期刊
Journal of Micropalaeontology
Journal of Micropalaeontology 生物-古生物学
CiteScore
4.30
自引率
5.00%
发文量
7
审稿时长
>12 weeks
期刊介绍: The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny.
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