Pliocene-Pleistocene Paleoceanography of the North Atlantic at Deep Sea Drilling Project Site 609
Pliocene-Pleistocene Paleoceanography of the North Atlantic at Deep Sea Drilling Project Site 609
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深海钻探项目 609 站点北大西洋上新世-更新世古海洋学
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
B. Clement
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文献类型：
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作者：
M. Raymo;W. Ruddiman;B. Clement
对3.5 ~ 1.0 Ma之间的609号测点的浮游有孔虫丰度变化记录进行了研究。在2.45 Ma的北方半球主要冰期开始之前，北大西洋水文发生了大的周期性变化，包括3.4和3.2 Ma之间的明显冷却。我们解释这个冷却事件作为一个长期的北大西洋漂移向南位移。在2.4 ~ 2.3 Ma之间，伴随着北方冰期的开始，有孔虫动物群发生了显著的变化，表现为Neogloboquadrina atlantica和Globorotalia puncticulata的消失，以及右卷曲Neogloboquadrina pachyderma丰度的增加。Globorotalia inflata，Globorotalia puncticulata的进化后代，是不是丰富的，在这个网站，直到2.1马，和左卷曲Neogloboquadrina厚皮没有成为一个优势的极地物种在这个地区，直到1.7马。
The Site 609 record of variations in planktonic foraminiferal abundance between 3.5 and 1.0 Ma was examined. Prior to the onset of major Northern Hemisphere glaciation at 2.45 Ma, large cyclic variations in North Atlantic hydrography occurred, including a pronounced cooling between 3.4 and 3.2 Ma. We interpret this cooling event as a long-term southward displacement of the North Atlantic Drift. Between 2.4 and 2.3 Ma, a dramatic change in the foraminiferal fauna, characterized by the disappearances of Neogloboquadrina atlantica and Globorotalia puncticulata and an increased abundance of right-coiling Neogloboquadrina pachyderma, followed the initiation of Northern Hemisphere glaciation. Globorotalia inflata, the evolutionary descendant of Globorotalia puncticulata, was not abundant at this site until 2.1 Ma, and left-coiling Neogloboquadrina pachyderma did not become a dominant polar species in this area until 1.7 Ma.