Abstract The biogeographic distribution of planktonic foraminifera from southern mid-to high latitudes region are discussed to identify links between species distribution patterns and the changes in Late Cretaceous climate. We present relative abundance data for planktonic foraminifera spanning from the hot greenhouse climate of the Turonian to the cooler greenhouse of the Maastrichtian based on study of Ocean Drilling Program (ODP) holes 690C (Maud Rise), 700B (Northeast Georgia Rise), 1138A (Kerguelen Plateau) and 762C (Exmouth Plateau). These drill sites were located between 47° and 65°S paleolatitude in the southern South Atlantic and southern Indian Ocean where there is a good record of changes in vertical gradients and sea surface temperatures (SSTs) and shifts are well expressed due to amplification of global climatic variations in the circum-Antarctic region. The stratigraphic distribution of planktonic foraminiferal marker species that consistently occur at all sites enables construction of a new biozonation scheme that is applicable to the southern mid-to high latitude region. Quantitative data from planktonic foraminifera are used to examine variation in assemblage composition, permitting interpretation of changes in the patterns of surface water stratification. In addition, temporal biogeographic patterns are documented from the stratigraphic record of endemic species of the Southern Ocean and of species displaying poleward or equatorward migration. Results indicate that the broadest latitudinal expansion of the Tethyan tropical climatic belt coincided with the highest paleotemperatures of the Turonian–Santonian. The onset of significant sea surface temperature cooling in the late Santonian–early Campanian led to a progressive increase in the latitudinal temperature gradient and greater biogeographic differentiation among planktonic foraminiferal assemblages. These trends resulted in the establishment of a Transitional Bioprovince with Tethyan and Austral affinities in the southern latitudes that persisted through the Campanian and Maastrichtian and the development of a well-defined Austral Bioprovince that is observed by the early Maastrichtian at paleolatitudes south of 60°S.

中文翻译：

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晚白垩世冷热温室气候过渡期间南部中高纬度浮游有孔虫生物地理分布格局的变化

摘要 讨论了南部中高纬度地区浮游有孔虫的生物地理分布，以确定物种分布模式与晚白垩世气候变化之间的联系。我们基于对海洋钻探计划 (ODP) 孔 690C (Maud Rise)、700B (Northeast Georgia Rise)、1138A (凯尔盖朗高原）和 762C（埃克斯茅斯高原）。这些钻探地点位于南大西洋南部和印度洋南部的 47° 至 65°S 古纬度之间，那里有很好的垂直梯度和海面温度 (SST) 变化记录，并且由于全球气候变化的放大而很好地表达了变化。环南极地区的气候变化。在所有地点一致出现的浮游有孔虫标记物种的地层分布使得构建适用于南部中高纬度地区的新生物区划方案成为可能。来自浮游有孔虫的定量数据用于检查组合组成的变化，从而可以解释地表水分层模式的变化。此外，从南大洋特有物种和向极地或赤道迁移的物种的地层记录中记录了时间生物地理模式。结果表明，特提斯热带气候带最宽的纬度扩张与Turonian-Santonian的最高古温度一致。桑托阶晚期 - 坎帕阶早期海面温度显着降温的开始导致纬度温度梯度的逐渐增加和浮游有孔虫组合之间更大的生物地理差异。