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Holocene relative sea level history from phreatic overgrowths on speleothems (POS) on Minami Daito Island, Northern Philippine Sea

机译:菲律宾北海南大东岛上潜栖类(POS)上的潜水过度生长的全新世相对海平面历史

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摘要

This research aims to elucidate the Holocene sea level (SL) variability on Minami Daito Island, Japan, where no previous such research has been done due to the apparent absence of any SL indicators. Here we use phreatic overgrowths on speleothems (POS) in a cave as an alternative SL indicator. The relationship between the highest modern groundwater fluctuation level (GWFL) and the highest POS level was studied, and the oldest POS calcite was dated using the radiocarbon method considering the dead carbon proportion (the "reservoir effect"). The results show that SL reached its Holocene maximum between ca. 5.1 and 4.6 ka cal BP, after which it remained more or less stable till the present day, with a possible minor sea-level drawdown of ca. 30-35 cm. Although the timing of the maximum Holocene SL coincides with mid-Holocene SL highstand observed across the tropical and subtropical Indo-Pacific, the relative stability of the SL after reaching its peak is not expected in the given subtropical setting. The SL on Minami Daito did not have a distinct highstand in the Holocene and instead followed closely the eustatic sea-level change. These findings are important in better understanding the mechanisms that control local relative SL variability and show the high value of POS as precise SL indicator. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.
机译:这项研究的目的是阐明日本南大东岛上的全新世海平面(SL)的变异性,该地区由于显然没有任何SL指标而没有进行过此类研究。在这里,我们将洞穴中的鞘翅目(POS)上的潜水过度生长用作替代的SL指标。研究了最高现代地下水波动水平(GWFL)与最高POS水平之间的关系,并使用放射性碳方法对最老的POS方解石确定了日期,并考虑了死碳比例(“储层效应”)。结果表明SL达到了大约全新世的最大值。 5.1和4.6 ka cal BP,此后直到今天一直保持稳定,可能会有大约2,000的海平面下降。 30-35厘米。尽管在整个热带和亚热带印度洋-太平洋地区观测到全新世SL的最大时间与全新世SL的中高位相吻合,但在给定的亚热带环境中,SL达到峰值后的相对稳定性并不理想。 Minami Daito上的SL在全新世没有明显的高位,而是紧随其后的欢乐海平面变化。这些发现对于更好地理解控制局部相对SL变异性的机制非常重要,并显示出POS作为精确SL指标的高价值。 (C)2017爱思唯尔有限公司和INQUA。版权所有。

著录项

  • 来源
    《Quaternary International》 |2018年第ptab期|359-368|共10页
  • 作者单位

    Kyushu Univ, Grad Sch Integrated Sci Global Soc, 7-4-4 Motooka, Fukukoka, Fukuoka 8190395, Japan;

    Univ Tokyo, Atmosphere & Ocean Res Inst, Analyt Ctr Environm Study, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan;

    Kyushu Univ, Fac Social & Cultural Studies, Nishi Ku, 7-4-4 Motooka, Fukuoka, Fukuoka 8190395, Japan;

    Univ Tokyo, Atmosphere & Ocean Res Inst, Analyt Ctr Environm Study, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan;

    Kyushu Univ, Grad Sch Integrated Sci Global Soc, 7-4-4 Motooka, Fukukoka, Fukuoka 8190395, Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sea level change; Holocene; Speleothem; Radiocarbon dating; Dead carbon proportion; Mid-Holocene highstand;

    机译:海平面变化;全新世;闪粉煤;放射性碳测年;死碳比例;全新世中期高压;
  • 入库时间 2022-08-18 03:35:07

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