Calcareous nannofossil evidence for the existence of the Gulf Stream during the late Maastrichtian
Calcareous nannofossil evidence for the existence of the Gulf Stream during the late Maastrichtian
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马斯特里赫特阶晚期存在墨西哥湾流的钙质超微化石证据
DOI：
10.1029/2004pa001121
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
J. Self‐Trail
中科院分区：
文献类型：
--
作者：
D. Watkins;J. Self‐Trail
[1]利用相关分析和主成分分析方法，对南卡罗来纳州海岸平原的8个岩心(陆上组)和大陆斜坡和深海丘陵(近海组)的3个深海钻探地点的上马斯特里赫期钙质超微化石组合进行了分析，以研究古地表水的热结构。此外，根据独立公布的古生物地理信息得出的温度指数被应用于样本数据。所有这三种方法都表明，样品被强烈地分成了陆上和离岸两组，而离岸数据组显示出明显变暖的古温度。这两组样本之间的巨大差异表明，尽管肥力、生产力和群落结构发生了明显的短期变化，但陆上和近海地表水团之间存在着强烈的热对比，这种对比持续了整个马斯特里赫特晚期。这表明，在马斯特里赫斯晚期，墨西哥湾流是一个主要的海洋学特征。
[1] Upper Maastrichtian calcareous nannofossil assemblages, from eight cores on the South Carolina Coastal Plain (onshore set) and three deep sea drilling sites from the continental slope and abyssal hills (offshore set), were analyzed by correlation and principal component analysis to examine the ancient surface water thermal structure. In addition, a temperature index derived from independently published paleobiogeographic information was applied to the sample data. All three methods indicate a strong separation of the samples into onshore and offshore sets, with the offshore data set exhibiting significantly warmer paleotemperatures. The great disparity between these two sample sets indicates that there was a strong thermal contrast between the onshore and offshore surface water masses that persisted throughout the late Maastrichtian despite evident short-term changes in fertility, productivity, and community structure. This suggests the Gulf Stream was present as a major oceanographic feature during the late Maastrichtian.