...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Late Paleocene-middle Eocene benthic foraminifera on a Pacific seamount (Allison Guyot, ODP Site 865): Greenhouse climate and superimposed hyperthermal events
【24h】

Late Paleocene-middle Eocene benthic foraminifera on a Pacific seamount (Allison Guyot, ODP Site 865): Greenhouse climate and superimposed hyperthermal events

机译：太平洋海山上的古新世-始新世中期底栖有孔虫（艾莉森•盖奥特，ODP站点865）：温室气候和叠加的高温事件

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We investigated the response of late Paleocene-middle Eocene (similar to 60-37.5Ma) benthic foraminiferal assemblages to long-term climate change and hyperthermal events including the Paleocene-Eocene Thermal Maximum (PETM) at Ocean Drilling Program (ODP) Site 865 on Allison Guyot, a seamount in the Mid-Pacific Mountains. Seamounts are isolated deep-sea environments where enhanced current systems interrupt bentho-pelagic coupling, and fossil assemblages from such settings have been little evaluated. Assemblages at Site 865 are diverse and dominated by cylindrical calcareous taxa with complex apertures, an extinct group which probably lived infaunally. Dominance of an infaunal morphogroup is unexpected in a highly oligotrophic setting, but these forms may have been shallow infaunal suspension feeders, which were ecologically successful on the current-swept seamount. The magnitude of the PETM extinction at Site 865 was similar to other sites globally, but lower diversity postextinction faunas at this location were affected by ocean acidification as well as changes in current regime, which might have led to increased nutrient supply through trophic focusing. A minor hyperthermal saw less severe effects of changes in current regime, with no evidence for carbonate dissolution. Although the relative abundance of infaunal benthic foraminifera has been used as a proxy for surface productivity through bentho-pelagic coupling, we argue that this proxy can be used only in the absence of changes in carbonate saturation and current-driven biophysical linking.
机译：我们在远洋钻探计划（ODP）站点865上调查了晚古新世-中始新世（类似于60-37.5Ma）底栖有孔虫组合对长期气候变化和高温事件的响应，包括古新世-始新世热最大值（PETM）艾莉森·盖伊特（Allison Guyot），中太平洋山脉的海山。海山是孤立的深海环境，增强的电流系统中断了海底—上层的耦合，对这种环境下的化石组合几乎没有进行评估。 865号站点的组合物种类繁多，以具有复杂孔口的圆柱形钙质类群为主导，这是一个绝种的种群，可能生活得很少。在高度贫营养的环境中，真菌形态基团的优势是出乎意料的，但是这些形式可能是浅层的真菌悬浮物进料器，在目前的海山上在生态学上是成功的。 865号站点上PETM灭绝的幅度与全球其他站点相似，但该地点灭绝后物种多样性较低的动物受到海洋酸化以及当前状况变化的影响，这可能导致通过营养集中而增加了养分供应。轻微的高温观察到当前方案变化的影响较小，没有证据表明碳酸盐溶解。尽管臭名昭著的底栖有孔虫的相对丰度已被用作通过底栖—上层耦合的地表生产力的替代物，但我们认为这种替代物只能在碳酸盐饱和度和电流驱动的生物物理连接没有变化的情况下使用。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号