古环境变化、海啸和台风对日本南部硅藻化石组合的影响

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2023-01-16 DOI:10.1111/iar.12476
Ara Cho, Kaoru Kashima, Hannah Baranes, Caroline Ladlow, Kota Katsuki, Jonathan D. Woodruff
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引用次数: 0

摘要

追踪古环境变化和过去事件沉积对自然灾害的空间评价具有重要意义。本文介绍了环境的变化,并暗示了事件沉积是如何依赖于硅藻组合的变化的。为了研究古环境变化并确定海啸和台风沉积物的差异,我们分析了日本南部两个沿海湖泊沉积物中的硅藻,这两个湖泊的洪水沉积物与历史上的台风和海啸事件有关(河原湖和龙游湖)。沉积物岩心从公元前500年延伸到大约公元1000年,硅藻组合的下岩心变化表明,在大约公元500年至1700年间,河原湖和琉球湖都经历了一系列从盐水环境到淡水环境的转变。我们观察到,在先前确定为海啸或台风成因的事件沉积中,硅藻组合有明显的偏差。对于1707年Hoei海啸保存在龙湖的最突出的事件沉积物来说,海洋硅藻的沉积是海洋洪水的证据,而随后的土壤和淡水硅藻的沉积表明了海流回流时陆源沉积物的动员。相比之下,河原湖最突出的事件沉积与公元1281年神风台风造成的淡水洪水有关,硅藻丰度非常低,淡水类群达到峰值,随后硅藻数量达到峰值,这可能是由于事件期间营养物质流入和再氧化引起的更大生物活性所致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fossil diatom assemblage changes due to paleoenvironment change, tsunami, and typhoon in southern Japan

Tracking paleoenvironmental change and past event deposits is very important to evaluate the natural hazard spatially. This paper presents how the environment changes and implies the event deposit depending on the diatom assemblage change. To investigate paleoenvironmental change and identify the difference between tsunami and typhoon deposits, we analyze diatoms from the sediments in two coastal lakes in southern Japan where flood deposits have been linked to historical typhoon and tsunami events (Lakes Kawahara and Ryuo). The sediment cores extend from B.C.E. 500 to approximately C.E. 1000 and the downcore variation in diatom assemblages indicates a series of transitions from saline to fresher conditions in both Lake Kawahara and Lake Ryuo between approximately C.E. 500 and 1700. We observe an obvious deviation in diatom assemblages in event deposits previously identified to be either of tsunami or typhoon in origin. For the most prominent event deposit preserved in Lake Ryuo by the Hoei tsunami of C.E. 1707, the deposition of marine diatoms serves as evidence of marine flooding, while the subsequent deposition of soil and freshwater diatoms indicates the mobilization of terrigenous sediment during returning seaward flows. In contrast, the most prominent event deposit in Lake Kawahara is associated with freshwater flooding by the Kamikaze typhoon of C.E. 1281 and contains very low diatom abundances and a peak of freshwater taxa, followed by a peak in diatom counts potentially due to greater biological activity induced by a resultant influx of nutrients and re-oxygenation during the event.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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