Late-glacial and Holocene deglaciation chronology of the northeast Icelandic Ice Cap

冰岛东北部冰盖晚冰期和全新世冰消年表

基本信息

  • 批准号:
    NE/I016058/1
  • 负责人:
  • 金额:
    $ 6.75万
  • 依托单位:
  • 依托单位国家:
    英国
  • 项目类别:
    Research Grant
  • 财政年份:
    2011
  • 资助国家:
    英国
  • 起止时间:
    2011 至 无数据
  • 项目状态:
    已结题

项目摘要

Close to the Arctic front, Iceland with its ice sheet is a strategic accessible natural laboratory to study past and modern climate changes. Like in Greenland the Icelandic Ice Sheet (IIS) provides freshwater to the North Atlantic and modifies the circulation of its thermohaline currents. While the IIS margins are relatively well constrained offshore by marine or coastal evidences, little is known about its onshore characteristics and its rates of recession during the Holocene warmer periods. This study aims at filling this chronological gap of the IIS inland during the late Quaternary deglaciation using cosmogenic nuclides dating in northeast Iceland. Terrestrial evidences of the ice sheet past margins such as moraines, glacial outwash and kame terraces have been identified north of Vatnajökull where two complementary and independent cosmogenic exposure isotopes (36Cl and 3He) will be used to date these morphological markers of the IIS retreat. In doing so, we will constrain the chronology of the ice margins and test ice-sheet deglaciation models. The cosmogenic sampling strategy will consist of complementary surface boulders and 36Cl depth profiles of amalgamated cobbles originating from common lava flows and embedded in the morphological markers. All surface samples will be dated by both 36Cl and 3He surface exposure ages from Ca-rich plagioclases and from cogenetic pyroxene phenocrysts, respectively. The double dating with 36Cl and 3He and a control of the production mechanisms with the associated depth profiles will ensure that the cosmogenic ages are sound and effective in providing age constraints of the IIS deglaciation. Improved understanding of the IIS behaviour during periods of known rapid climate change will provide new tie-points for the calibration of the IIS models and will allow a better assessment of the volume and timing of terrestrial meltwater flux to the North Atlantic. This work will contribute to a better understanding of climate evolution in the North Hemisphere over the last 20 ka and, to a better understanding of the evolution of modern Ice sheets using analogue from the past.
冰岛靠近北极前沿,拥有冰盖,是研究过去和现代气候变化的战略性天然实验室。与格陵兰岛一样,冰岛冰盖为北大西洋提供淡水,并改变其温盐流的循环。虽然IIS的利润率相对较好地限制海上海洋或沿海的证据,鲜为人知的是,其陆上的特点和它的衰退率在全新世温暖的时期。本研究的目的是填补这一时间差距的IIS内陆晚第四纪冰消期在冰岛东北部使用宇宙成因核素测年。在瓦特纳冰川以北,已经发现了冰盖过去边缘的陆地证据,如冰碛、冰川沉积物和冰碛阶地,在那里将使用两种互补和独立的宇宙成因暴露同位素(36Cl和3He)来确定IIS撤退的这些形态标志的日期。在这样做的过程中,我们将限制冰缘的年表和测试冰盖消融模型。宇宙成因取样策略将包括互补的表面巨砾和36Cl深度剖面的混合鹅卵石起源于共同的熔岩流,并嵌入形态标记。所有的表面样品将分别从富钙斜长石和同生辉石斑晶的36Cl和3He表面暴露年龄。36Cl和3He的双重定年以及与相关深度剖面的生产机制的控制将确保宇宙成因年龄是合理和有效的,提供IIS冰消期的年龄限制。在已知的快速气候变化期间,更好地了解IIS的行为将为IIS模型的校准提供新的联系点,并将能够更好地评估北大西洋陆地融水通量的数量和时间。这项工作将有助于更好地了解北半球过去20 ka的气候演变,并利用过去的模拟更好地了解现代冰盖的演变。

项目成果

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科研奖励数量(0)
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Anne-Sophie Mériaux其他文献

The 1905 Chamonix earthquakes: active tectonics in the Mont Blanc and Aiguilles Rouges massifs
  • DOI:
    10.1007/s00015-017-0262-7
  • 发表时间:
    2017-02-02
  • 期刊:
  • 影响因子:
    2.600
  • 作者:
    Michel Cara;Jérôme Van der Woerd;Pierre-Jean Alasset;Juan Benjumea;Anne-Sophie Mériaux
  • 通讯作者:
    Anne-Sophie Mériaux
20supth/sup-century strain accumulation on the Lesser Antilles megathrust based on coral microatolls
基于珊瑚微环礁的小安的列斯群岛巨型逆冲带 20 世纪上半叶的应变积累
  • DOI:
    10.1016/j.epsl.2021.117343
  • 发表时间:
    2022-02-01
  • 期刊:
  • 影响因子:
    5.100
  • 作者:
    Belle Philibosian;Nathalie Feuillet;Jennifer Weil-Accardo;Eric Jacques;Abel Guihou;Anne-Sophie Mériaux;André Anglade;Jean-Marie Saurel;Sébastien Deroussi
  • 通讯作者:
    Sébastien Deroussi

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