Non-destructive analyses to determine appropriate stratigraphic level for dating of tsunami deposits

Non-destructive analyses to determine appropriate stratigraphic level for dating of tsunami deposits
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无损分析以确定海啸沉积物测年的适当地层水平

DOI:
10.1016/j.margeo.2019.02.009
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发表时间:
2019
期刊:
影响因子:
2.9
通讯作者:
Miyairi Yosuke
Miyairi Yosuke
中科院分区:
地球科学2区
文献类型:
--
作者:
Ishizawa Takashi;Goto Kazuhisa;Yokoyama Yusuke;Miyairi Yosuke

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海啸沉积物的上边界通常包括一个以泥为主的层,称为泥盖,这是由悬浮沉积物中不同粒度的不同沉降时间造成的。这种泥帽通常与海啸后正常情况下沉积的泥浆难以区分。事实上,对海啸砂质沉积物上方的有机物质进行年代测定,往往会得出比实际年龄更早的年代,因为泥盖层含有各种各样的夹带物质。在此,我们提出了几个与泥盖有关的分析结果。我们的研究结果表明,泥浆帽很难在视觉上识别,而CT和XRF分析使我们能够以非破坏性的方式识别它们。对于海啸沉积物的定年,在取样之前进行这种非破坏性分析以识别不利的地层成分是至关重要的。这种细致的采样对于海啸沉积物的准确测年至关重要,而准确测年对于重建古海啸的规模和频率至关重要。因此,我们的发现也将有助于海啸危害评估。
The upper boundary of a tsunami deposit often comprises a mud-dominated layer, called a mud cap, resulting from the different settling times of various grain sizes in the suspended sediment. This mud cap is often visibly indistinguishable from muds that can be deposited under normal circumstances following a tsunami. In fact, dating organic material immediately above the sandy tsunami deposit often produces significantly older ages than the actual age of the event because of the mud cap contains a wide variety of entrained material. Herein, we present several analytical results related to mud caps. Our results indicate that mud caps are difficult to recognize visually, whereas CT and XRF analyses enable us to recognize them in a non-destructive way. For the dating of tsunami deposits, it is crucially important to conduct such non-destructive analyses before sampling to recognize unfavorable stratigraphic components for dating. Such careful sampling is extremely important for accurate dating of tsunami deposit which is essential for reconstruction of paleotsunami size and its frequency. Therefore, our finding will also contribute to tsunami hazard assessment.
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