Testing the annual nature of speleothem banding.

Testing the annual nature of speleothem banding.
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测试洞穴生物带的年度性质

DOI:
10.1038/srep02633
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Tan, Ming
Tan, Ming
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Shen, Chuan-Chou;Lin, Ke;Duan, Wuhui;Jiang, Xiuyang;Partin, Judson W.;Edwards, R. Lawrence;Cheng, Hai;Tan, Ming

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洞穴沉积物纹层已被假定为每年形成,这种纹层年代学被广泛应用于高分辨率的现代和过去的气候重建。然而,这一论点并没有得到高分辨率测年方法的直接支持。本文介绍了现代单纹层~(230)Th测年技术,其2σ精度可达±0.5年,对仙人洞近300年的石笋进行了测年。 我们发现这些层并不总是每年存款。在不同的年代际间隔中,年度波段可能被低估或高估数年。在这个例子中,缺失和假带的不规则形成表明,在气候重建中,年度洞穴沉积物纹层的假设应该在没有可靠的绝对年代学的情况下谨慎对待。
Speleothem laminae have been postulated to form annually and this lamina-chronology is widely applied to high-resolution modern and past climate reconstructions. However, this argument has not been directly supported by high resolution dating methods. Here we present contemporary single-lamina230Th dating techniques with 2σ precision as good as ±0.5 yr on a laminated stalagmite with density couplets from Xianren Cave, China, that covers the last 300 years. We find that the layers do not always deposit annually. Annual bands can be under- or over-counted by several years during different multi-decadal intervals. The irregular formation of missing and false bands in this example indicates that the assumption of annual speleothem laminae in a climate reconstruction should be approached carefully without a robust absolute-dated chronology.
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