Record of Deep-Sea, Benthic Elongate-Cylindrical Foraminifera Across the Eocene-Oligocene Transition in the North Atlantic Ocean (ODP Hole 647A)
Record of Deep-Sea, Benthic Elongate-Cylindrical Foraminifera Across the Eocene-Oligocene Transition in the North Atlantic Ocean (ODP Hole 647A)
复制标题
北大西洋始新世-渐新世过渡时期的深海底栖细长柱状有孔虫记录（ODP 孔 647A）
DOI：
10.2113/gsjfr.42.4.345
复制
发表时间：
2012
影响因子：
1.1
通讯作者：
M. Kaminski
中科院分区：
文献类型：
--
作者：
S. Ortiz;S. Ortiz;M. Kaminski;M. Kaminski
∼34 Ma的始新世-渐新世转换是近50年来气候变化的主要时期之一，与南极永久冰盖的建立和经向翻转环流的启动有关。我们提出了一组钙质深海底栖有孔虫的高分辨率定量研究(>；125-μm组分)，这些有孔虫具有细长的柱状形态(拉长的GP。)横跨北大西洋高纬度地区的EOT(ODP647A孔)。这一群体在全球变冷期间经历了丰度和多样性的显著下降，在中更新世气候转型期间几乎完全消失。
细长的GP。是647A孔深海底栖有孔虫组合的常见成分(平均20%)。始新世晚期和晚更新世，球囊藻科占优势；渐新世早期，节虫科略占优势。在647A孔的EOT期间，凝集的有孔虫的丰度和多样性突然下降，但细长的GP的分类更替并不明显。水蚤是最丰富的物种，其相对丰度在整个EOT期间变化最显著，从几乎没有记录到占底栖有孔虫总数的50%的峰值，与细长GP的最低多样性和最高绝对丰度一致。我们将这些变化归因于多种机制的影响，包括生产力的提高，方解石补偿深度的加深，以及更活跃的深海环流。
The Eocene-Oligocene transition (EOT) at ∼34 Ma constitutes one of the major episodes of climate change that occurred in the last 50 myr, associated with the establishment of permanent Antarctic ice sheets and the initiation of meridional overturning circulation. We present a high-resolution quantitative study (>125-μm fraction) of a group of calcareous, deep-sea, benthic foraminifera with elongate-cylindrical morphologies (Elongate Gp.) across the EOT at high latitudes in the North Atlantic Ocean (ODP Hole 647A). This group experienced significant declines in abundance and diversity during periods of global cooling, disappearing almost completely during the mid-Pleistocene Climate Transition.
The Elongate Gp. was a common component of deep-sea benthic foraminiferal assemblages at Hole 647A (average 20%). The family Stilostomellidae dominated during the late Eocene and at the EOT; the Nodosariidae slightly dominated during the early Oligocene. During the EOT at Hole 647A, an abrupt decline in the abundance and diversity of agglutinated foraminifera occurred, but not a distinct taxonomic turnover of the Elongate Gp. Siphonodosaria jacksonensis was the most abundant species and showed the most significant changes in relative abundance across the EOT, from almost no record to a peak of >50% of total benthic foraminifera coincident with the lowest diversity and highest absolute abundance of the Elongate Gp. We attribute these changes to the influence of more than one mechanism, including increased productivity, deepening of the calcite compensation depth, and more vigorous deep-ocean circulation.
ODP 647A 孔古近纪的综合生物磁年代学：对从高纬度到低纬度古海洋事件进行关联的意义
DOI：
10.1144/sp373.9
发表时间：
2012
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
Firth J
通讯作者：
Firth J
DOI：
10.1016/j.palaeo.2011.09.008
发表时间：
2011-11
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
L. Cotton;P. Pearson
通讯作者：
L. Cotton;P. Pearson
影响因子：
5.8
作者：
Lear, Caroline H.;Bailey, Trevor R.;Rosenthal, Yair
通讯作者：
Rosenthal, Yair