Larger benthic foraminiferal response to the PETM in the Potwar Basin (Eastern Neotethys, Pakistan)
Larger benthic foraminiferal response to the PETM in the Potwar Basin (Eastern Neotethys, Pakistan)
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波特瓦尔盆地（巴基斯坦东新特提斯）对 PETM 的较大底栖有孔虫反应
DOI：
10.1016/j.palaeo.2021.110450
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发表时间：
2021-08
期刊：
影响因子：
--
通讯作者：
Xiaoqiao Wan
中科院分区：
文献类型：
--
作者：
Muhammad Kamran;Fabrizio Frontalini;Dangpeng Xi;Cesare Andrea Papazzoni;Arman Jafarian;Khalid Latif;Tian Jiang;Kamran Mirza;Huyue Song;Xiaoqiao Wan
古新世-始新世热盛期（PETM）是新生代最显著的全球性和短暂的变暖事件，与生物圈、大气圈和水圈的显著变化有关。根据大型底栖有孔虫（LBF）生物地层学和δ ~（13）C记录，确定了巴基斯坦Potwar盆地Duleram剖面的古近世-始新世界线和PETM事件。这一浅海碳酸盐存款提供了一个独特的机会，详细研究的地层记录的PETM及其对LBF组合在东部新特提斯洋。利用~5‰的负碳同位素偏移（CIE）确定了SBZ 5基底的古新统-始新世界线。CIE与LBF组合中的明显成分变化不直接相关，而是在CIE恢复阶段期间识别。LBF组合的显著变化是Misspacea juliettae、Misspacea dukhani、Ranikothalia nuttalli、Ranikothalia sindensis、Daviesina tenuis、Daviesina langhamian和Orbitosiphon punjabensis的消失，以及Alveolina ellipsoidalis、Alveolina globula、Alveolina mousoulensis、Alveolina minervensis、Alveolinaavellana aurignacensis、Orbitalina biplanus、Nummulites fraasi、Nummulites minervensis和miliolids的出现，它们对应于SBZ 5和SBZ 6之间的界线。在CIE恢复阶段的PETM的LBF组合的变化是由于增强大陆风化和增加的温度和有机含量通量，改变了栖息地从贫营养到富营养的条件。这项研究提供了第一个证据的PETM在浅水沉积在Potwar盆地，并表明，在LBF组合的变化响应PETM变暖事件影响浅海接壤的东部新特提斯洋。
The Paleocene-Eocene Thermal Maximum (PETM) was the most pronounced global and transient warming event of the Cenozoic and was associated with marked changes in the biosphere, atmosphere and hydrosphere. On the basis of the large benthic foraminiferal (LBF) biostratigraphy coupled with δ13C record, the PETM event and the Paleocene-Eocene boundary are constrained in the Duleram section (Potwar Basin, Pakistan). This shallow-marine carbonate deposit offers a unique opportunity to study in detail the stratigraphic record of the PETM and its effect on LBF assemblages in the eastern Neotethyan Ocean. The ~5‰ negative carbon isotope excursion (CIE) is here used to pinpoint the Paleocene-Eocene boundary corresponding to the base of SBZ 5. The CIE is not directly associated with evident compositional changes in the LBF assemblages that are instead identified during the CIE recovery phase. The prominent LBF assemblages' changes are marked by the disappearance ofMiscellanea juliettae,Miscellanea dukhani,Ranikothalia nuttalli,Ranikothalia sindensis,Daviesina tenuis,Daviesina langhamiandOrbitosiphon punjabensisand by the appearance ofAlveolina ellipsoidalis,Alveolina globula,Alveolina moussoulensis,Alveolina minervensis,Alveolinaavellana aurignacensis,Orbitolites biplanus,Nummulites fraasi,Nummulites minervensisand miliolids that correspond to the boundary between SBZ 5 and SBZ 6. The change in the LBF assemblages during the CIE-recovery phase of PETM is attributed to enhanced continental weathering and increased temperature and organic content flux that altered the habitat from oligotrophic to eutrophic conditions. This study provides the first evidence of the PETM at shallow marine deposits in the Potwar Basin and shows that change in the LBF assemblages in response of the PETM warming event affected shallow seas bordering the eastern Neotethyan Ocean.
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影响因子：
3.9
作者：
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通讯作者：
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