Interglacial vegetation in South Westland, South Island, New Zealand
Interglacial vegetation in South Westland, South Island, New Zealand
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新西兰南岛南韦斯特兰的间冰期植被
DOI：
10.1080/00288306.2001.9514918
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发表时间：
2001
影响因子：
2.2
通讯作者：
I. Mckellar
中科院分区：
文献类型：
--
作者：
N. Moar;I. Mckellar
本文讨论了新西兰南韦斯特兰岛Ianthe湖北部Greens海滩的北方和南方两端的有机沉积物的两个Pollfen图解。沉积物覆盖在倒数第二次冰期（怀明冰期）的冰碛物上，南部的冰碛物被埋在c。12 m末次冰期（Otiran Glacial）形成的河流冰川砾石;在北方，泥炭被淤泥、可能是漫滩沉积物和黄土覆盖。花粉图主要反映了末次间冰期（Kaihinu）的事件。虽然这两张图代表了间冰期的同一阶段，但由于北方（Opuku）站点的花粉记录中断，相似之处并不明显。两个放射性碳测年，一个来自中段（NZ 4379 A，29600 ± 850 14 C yr BP），另一个来自更接近底部（NZ 4378 A，38000 + 4450 - 2850 14 C yr BP），提供了该地点的中期Otiran年龄。由于花粉图反映了间冰期的条件，并且由于有机沉积物的地层位置，这些日期被认为太年轻而被拒绝。
Abstract Two pollfen diagrams derived from organic sediments at the northern and southern ends of Greens Beach, north of Lake Ianthe, South Westland, New Zealand, are discussed. The sediments overlie till of the penultimate glaciation (Waimean Glacial) and at the southern site are buried beneath c. 12 m of fluvioglacial gravels of last glacial (Otiran Glacial) origin; at the northern site, the peats are overlain by silt, probably overbank deposits, and loess. The pollen diagrams reflect mostly events of the last interglacial (Kaihinu). Although both diagrams represent the same phase of the interglacial, similarities are not immediately apparent because of breaks in the pollen record from the northern (Opuku) site. Two radiocarbon dates, one from mid section (NZ4379A, 29 600 ± 850 14C yr BP) and one from nearer the base (NZ4378A, 38 000 + 4450 ‐2850 14C yr BP), provide a mid‐Otiran age for the site. Because the pollen diagrams reflect interglacial conditions, and because of the stratigraphic position of the organic sediments, the dates are rejected as being too young.