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王健

【论文题目】 Time Constraints and Tie-Points in the Quaternary Period
【英文标题】
【论文作者】 DA Richards，MB Andersen
【出处】 《Elements》, 2013, 9(1):45-51
【时间】 2013
【内容简介】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, 40Ar/39Ar and 14C) 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).

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