Quartz and polymineral luminescence dating of Japanese loess over the last 0.6 Ma: Comparison with an independent chronology
Quartz and polymineral luminescence dating of Japanese loess over the last 0.6 Ma: Comparison with an independent chronology
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DOI：
10.1016/j.epsl.2005.09.027
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发表时间：
2005-12
影响因子：
5.3
通讯作者：
T. Watanuki;A. Murray;S. Tsukamoto
中科院分区：
文献类型：
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作者：
T. Watanuki;A. Murray;S. Tsukamoto
在日本只有少数黄土沉积物的发光测年研究，但与这些沉积物交错的是许多基于14 C和裂变径迹分析的已知年龄的描述良好的火山灰;这些独立的年龄控制提供了一个机会，以测试黄土发光年龄的可靠性。这项研究提供了这样一个比较，在中部的两个网站在日本列岛最大的岛屿本州岛。从沉积在新泻县中更新世河流阶地上的交错火山碎屑和黄土序列中采集样品，并在本州的栃木县早中更新世切割的河流表面上采集样品。用多矿物IR-OSL和（后IR）蓝-OSL以及石英蓝-OSL估算了细粒（4-11 μm）的等效剂量（De）。几乎所有的估计Defrom多矿物IR-OSL小于那些从多矿物（后IR）蓝-OSL和石英蓝-OSL，而后两者是在很好的协议。蓝光激发发光年龄使用最光敏的组件被证明是在良好的协议与独立的控制，高达500 ka。虽然IR-OSL信号低估了已知的年龄，一个简单的实验室褪色测试发现经验，以纠正这种低估。我们的结论是，从我们的黄土样品中提取的石英最迅速的蓝色激发发光信号给出可靠的年龄，未来的黄土测年研究应该集中在这些信号。
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 on14C 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 (De) were estimated from fine grains (4–11 μm) 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 Deestimation. Almost all the estimates of Defrom 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.