Late Oligocene early Miocene glacial record of the Ross Sea, Antarctica: Evidence from DSDP Site 270
Late Oligocene early Miocene glacial record of the Ross Sea, Antarctica: Evidence from DSDP Site 270
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南极洲罗斯海的晚渐新世早中新世冰川记录：来自 DSDP Site 270 的证据
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
P. Webb
中科院分区：
文献类型：
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作者：
R. M. Leckie;P. Webb
利用南极罗斯海270号深海钻探点的有孔虫化石，对晚渐新世-早中新世早期冰川作用进行了研究。罗斯海中部经历了显着的水深和海洋学的演变与冰川海洋沉积的开始，导致四个对比有孔虫种群（组合区）的顺序发展。在最新的古近纪-新近纪早期，罗斯地区的气候逐渐变化，在早中新世晚期的主要冰堆积中达到顶峰。来自我们的微型动物群研究的结论重申气候和海洋学趋势解释的罗斯以北的亚南极深海站点的氧同位素数据。海罗斯海地区冰川作用的加剧可能是造成南极底层水产量增加以及低纬度地区广泛的新第三纪早期深海间断的相关原因。
Foraminifera from Deep Sea Drilling Project Site 270, Ross Sea, Antarctica, are used to trace an early phase of glaciation during the late Oligocene–early Miocene. The central Ross Sea underwent significant bathymetric and oceanographic evolution with the inception of glaciomarine sedimentation, resulting in the sequential development of four contrasting foraminiferal populations (assemblage zones). Gradual climatic change in the Ross Sector during latest Paleogene-early Neogene time culminated in major ice build-up by the late early Miocene. Conclusions derived from our microfaunal studies reaffirm climatic and oceanographic trends interpreted from oxygen-isotope data for sub-Antarctic deep sea sites north of the Ross. Sea. Intensification of glaciation within the Ross Sea area may be responsible for the increase in production of Antarctic Bottom Water and associated development of widespread early Neogene deep-sea hiatuses reported from lower latitude regions.