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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Quartz and polymineral luminescence dating of Japanese loess over the last 0.6 Ma: Comparison with an independent chronology
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Quartz and polymineral luminescence dating of Japanese loess over the last 0.6 Ma: Comparison with an independent chronology

机译：过去0.6 Ma内日本黄土的石英和多矿物发光年代：与独立年表的比较

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摘要

There are only a few luminescence dating studies of loess sediments in Japan, but interleaved with these deposits are many well-described tephras of known age based on C-14 and fission track analysis; these independent age controls provide an opportunity to test the reliability of loess luminescence ages. This study provides such a comparison at two sites in central Honshu, the largest island in the Japanese archipelago. Samples were collected from sequences of interleaved volcanic tephra and loess deposited on a Middle Pleistocene river terrace in the Niigata Prefecture and on an Early to Middle Pleistocene dissected fluvial surface at in the Tochigi Prefecture, Honshu. Equivalent doses (D-e) were estimated from Fine grains (4-11 mu m) using both polymineral IR-OSL and (post-IR) blue-OSL, and quartz blue-OSL. The blue-stimulated luminescence signals could be represented by up to three exponentially decaying components; only the most light sensitive of these components was used in the final D-e estimation, Almost all the estimates of D-e from polymineral IR-OSL are smaller than those from polymineral (post-IR) blue-OSL and quartz blue-OSL, whereas the latter two are in good agreement. The blue-light stimulated luminescence ages using the most light sensitive component are shown to be in good agreement with the independent control, up to 500 ka. Although the IR-OSL signals underestimate the known age, a simple laboratory fading test is found empirically to correct for this underestimation. We conclude that the most rapidly blue-stimulated luminescence signals from quartz extracted from our loess samples give reliable ages, and that future loess dating studies should concentrate on these signals. (C) 2005 Elsevier B.V. All rights reserved.
机译：在日本，很少有关于黄土沉积物的发光测年研究，但根据C-14和裂变径迹分析，许多这些已知年龄的特弗拉斯与这些沉积物交织在一起。这些独立的年龄控制为测试黄土发光年龄的可靠性提供了机会。这项研究在日本群岛最大的岛本州中部的两个地点进行了比较。从沉积在新泻县中更新世河阶地和本州gi木县早更新世至中更新世河床表面的交错火山岩和黄土序列中收集样品。使用多矿物IR-OSL和（IR后）blue-OSL和石英blue-OSL从细颗粒（4-11μm）估算等效剂量（D-e）。蓝色刺激的发光信号最多可以由三个指数衰减的分量表示。在最终的De估计中仅使用了这些成分中对光最敏感的元素，多矿物IR-OSL中几乎所有的De估计值都比多矿物（后IR）蓝OSL和石英蓝OSL中的De估计值小，而后者两者相吻合。使用最敏感的成分，蓝光激发的发光年龄显示与独立控制（至500 ka）良好吻合。尽管IR-OSL信号低估了已知年龄，但凭经验发现了简单的实验室褪色测试可纠正这种低估。我们得出的结论是，从我们的黄土样品中提取的石英中最快速的蓝光激发发光信号给出了可靠的年龄，并且未来的黄土年代测定研究应集中在这些信号上。 （C）2005 Elsevier B.V.保留所有权利。

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