Time Constraints and Tie-Points in the Quaternary Period
Time Constraints and Tie-Points in the Quaternary Period
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DOI：
10.2113/gselements.9.1.45
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发表时间：
2013-02
期刊：
影响因子：
4.5
通讯作者：
D. Richards;M. B. Andersen
中科院分区：
文献类型：
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作者：
D. Richards;M. B. Andersen
第四纪由于其环境档案的近地表保存和广泛访问，为测试气候变化，海平面变化，地磁场变化，人类和动物迁移，文化进化等模型提供了基本数据。空间上不同的记录，过去的环境变化与subannual到multimillennial的时间分辨率进行比较，以检查事件的相对时间，并考虑因果机制，这种分析提出了很大的要求可用的时间工具。需要高度精确和准确的年龄估计，与相关的工具或年代地层标志。我们专注于放射性同位素计时器（例如U系列、40 Ar/ 39 Ar和14 C），并在三个需要不同策略的小插曲中说明它们的应用：（1）最后一次冰川消退的戏剧性几十年（~ 14.7ka），（2）最后一次地磁漂移前后（~41 ka）;（3）中更新世冰期-间冰期旋回（125-780 ka）。
The Quaternary Period, by virtue of the near-surface preservation and widespread accessibility of its environmental archives, provides fundamental data to test models of climate change, sea level variation, geomagnetic field variation, human and faunal migration, cultural evolution and more. Spatially disparate records of past environmental change with subannual to multimillennial temporal resolution are compared to examine the relative timing of events and consider causal mechanisms, and this analysis puts great demands on the chronological tools available. Highly precise and accurate age estimates are required, in concert with correlative tools or chronostratigraphic markers. We focus on radioisotope chronometers (e.g. U-series, 40 Ar/ 39 Ar and 14 C) and illustrate their application in three vignettes for which different strategies are required: (1) the dramatic decades of the last deglaciation (~14.7 ka), (2) before and after one of the last geomagnetic excursions (~41 ka) and (3) the glacial–interglacial cycles of the Middle Pleistocene (125–780 ka).