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Benthic foraminiferal turnover across the Dan-C2 event in the eastern South Atlantic Ocean (ODP Site 1262)
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 3 ) Pub Date : 2021-04-18 , DOI: 10.1016/j.palaeo.2021.110410
Gabriela J. Arreguín-Rodríguez , James S.K. Barnet , Melanie J. Leng , Kate Littler , Dick Kroon , Daniela N. Schmidt , Ellen Thomas , Laia Alegret

The Paleogene was punctuated by perturbations of the global carbon cycle, many associated with transient global warming events (hyperthermals). The Dan-C2 event (~160 kyr after Cretaceous/Paleogene boundary; K/Pg) was the oldest of these eccentricity-linked carbon cycle disturbances (ELCD). In contrast to other hyperthermals, the Dan-C2 event was not characterised by bottom water warming, and surface water warming probably was not global. Benthic foraminiferal assemblages across Dan-C2 at SE Atlantic Ocean Drilling Program (ODP) Site 1262 are diverse and strongly dominated by calcareous species. Epifaunal and infaunal morphogroups are equally abundant, suggesting meso-oligotrophic seafloor conditions. Assemblages decreased in diversity gradually before Dan-C2, and Nuttallides truempyi decreased in relative abundance while Stensioeina beccariiformis and the agglutinant Spiroplectammina spectabilis increased, suggesting enhanced food supply to the seafloor. Benthic foraminifera were not highly affected by the Dan-C2 event. An increase in relative abundance of the opportunistic species Bulimina kugleri and Seabrookia cretacea after Dan-C2 points to a change in the type of organic matter arriving at the seafloor. These changes may have been caused by ongoing environmental and/or evolutionary instability following K/Pg mass extinction of oceanic plankton. Variability in composition of pelagic ecosystems, thus the type and/or amount of food arriving at the seafloor, may have been caused by the gradual recovery of pelagic ecosystems after that extinction, possibly affected by warming and pH changes due to Deccan volcanism.



中文翻译:

南大西洋东部Dan-C2事件的底栖有孔虫周转率(ODP地点1262)

古近纪被全球碳循环的扰动所打断,许多与短暂的全球变暖事件(高温)有关。Dan-C2事件(白垩纪/古近界后约160年; K / Pg)是这些与偏心率相关的碳循环扰动(ELCD)中最古老的事件。与其他高温相比,Dan-C2事件没有以底水变暖为特征,地表水变暖可能不是全球性的。SE大西洋钻井计划(ODP)站点1262上Dan-C2上的底栖有孔虫组合是多种多样的,并且以钙质物种为主导。上表观和非表观形态基团同样丰富,表明中低营养型海底条件。在Dan-C2和Nuttallides truempyi之前,群落的多样性逐渐降低相对丰度下降,而贝氏拟杆菌(Stensioeina beccariiformis)和凝集性螺旋藻(Spiroplectammina spectabilis)增加,表明向海底的食物供应增加。底栖有孔虫并未受到Dan-C2事件的严重影响。机会性物种Bulimina kugleriSeabrookia cretacea的相对丰度增加Dan-C2指出到达海底的有机物类型发生了变化。这些变化可能是由于海洋浮游生物的K / Pg大规模灭绝后持续的环境和/或进化上的不稳定性引起的。中上层生态系统组成的变化,即到达海底的食物的类型和/或数量,可能是由于灭绝后中上层生态系统的逐渐恢复引起的,可能受德干火山活动引起的变暖和pH值变化的影响。

更新日期:2021-04-29
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