HOLOCENE OVERWASH OCCURRENCE AGE IN THE ISUMI RIVER LOWLAND, EASTERN BOSO PENINSULA, JAPAN

IF 2 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Radiocarbon Pub Date : 2023-12-06 DOI:10.1017/rdc.2023.105

Soichiro Oda, Stephen P Obrochta, Osamu Fujiwara, Yusuke Yokoyama, Yosuke Miyairi, Yoshiya Hatakeyama

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Abstract

Analysis of the chronological data and observation of a lagoonal sediment core reveal sand washover events between around 2.4 to 2.5 cal. ky BP in the Isumi River lowland. We conducted radiocarbon dating with AMS and constructed an age-depth model using the latest calibration curve and appropriate model routine. In the middle to lower part of the core, dark-gray sand layers are repeatedly deposited. Sand layers may exhibit an erosional surface at the base with fining upward grading. The overwash layers are composed of well-rounded sand with occasional gravel, indicative of transportation. overwash sediment characteristics are consistent with proximal marine deposits, suggesting an ocean origin (though riverine sediment is also similar in character). The age-depth model indicates very high sediment accumulation rates associated with overwash deposits. Based on the amount of accumulated sediment, relatively large-scale redeposition events occurred during this period but more information is needed to constrain the mechanism(s) causing the events. We also present a local reservoir age correction compatible with the Marine20 calibration curve.

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日本东波索半岛等静河低地全新世冲过期

对一个泻湖沉积物岩心的年代学分析和观测表明，Isumi河低地在2.4 ~ 2.5 cal. ky BP之间发生了冲砂事件。利用AMS进行了放射性碳测年，并利用最新的校正曲线和合适的模型程序构建了年龄深度模型。岩心中下部反复沉积深灰色砂层。砂层可能在底部呈现侵蚀面，向上分级细化。上冲层由圆润的沙子和偶尔的砾石组成，表明了运输。上冲沉积物的特征与近海相沉积物一致，表明其起源为海洋(尽管河流沉积物的特征也相似)。年龄-深度模型表明，与过冲沉积物相关的沉积物堆积率非常高。根据沉积物的累积量，这一时期发生了相对大规模的再沉积事件，但需要更多的信息来约束事件发生的机制。我们还提出了一个与Marine20校准曲线兼容的局部储层年龄校正。

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来源期刊

Radiocarbon 地学-地球化学与地球物理

CiteScore

16.20

自引率

6.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.