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A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.gloplacha.2020.103217
J. Giraudeau , E. Georgiadis , M. Caron , P. Martinez , G. St-Onge , I. Billy , P. Lebleu , O. Ther , G. Massé

Abstract A better understanding of the past dynamics of local sectors of the Greenland ice sheet (GIS) with regards to ocean circulation and climate changes can be developed from proxy records derived from marine sedimentary archives. Here we investigate the post 9.1 cal. Kyr BP history of the western sector of the GIS from the XRF core scanner-derived geochemistry of a sediment core retrieved from Upernavik Trough, Melville Bay. The elemental signature of material derived from Melville Bay glaciers, Upernavik Isstrom and Rink Isbrae can be inferred from the geology of the bedrocks drained by these major ice streams of the western GIS. Changes in abundance of Fe-rich basaltic material reflect changes in West Greenland Current (WGC) strength. Contributions from Melville Bay glaciers were dominant during the early part of the record as a result of the rapid retreat of this stretch of the NW GIS. Atmospheric warming and strengthened WGC between 7.5 and 5 cal. Kyrs BP promoted contributions from distal southern sources of lithic material to the sedimentation over Upernavik Trough. The Neoglacial shift in climate and ocean circulation led to a general reduction in the delivery of lithic material from western GIS glacier outlets glaciers. The particular geomorphology of the fjord hosting Rink Isbrae as well as the important depth of the Uummannaq Trough likely explain the high relative contribution of this glacier to the lithic sedimentation over Upernavik Trough during the later part of the Holocene despite a weakened WGC.

中文翻译:

格陵兰西部乌佩纳维克海槽冰川后岩屑沉积的高分辨率元素记录:过去 9100 年冰盖动力学和海洋环流变化的历史

摘要 可以从海洋沉积档案的代理记录中更好地了解格陵兰冰盖 (GIS) 当地部分过去在海洋环流和气候变化方面的动态。在这里,我们调查 9.1 后校准。Kyr BP 地理信息系统西部部分的历史,来自 XRF 岩心扫描仪衍生的地球化学,从梅尔维尔湾的乌佩纳维克海槽检索到的沉积岩心。来自梅尔维尔湾冰川、乌佩纳维克冰川和 Rink Isbrae 的材料的元素特征可以从西部 GIS 的这些主要冰流排出的基岩的地质情况中推断出来。富铁玄武岩物质丰度的变化反映了西格陵兰洋流 (WGC) 强度的变化。由于这一段西北地理信息系统迅速退缩,梅尔维尔湾冰川的贡献在记录的早期阶段占主导地位。大气变暖和 7.5 到 5 cal 之间的 WGC 增强。Kyrs BP 促进了南部远端岩屑源对乌佩纳维克海槽沉积的贡献。气候和海洋环流的新冰期转变导致来自西部 GIS 冰川出口冰川的岩屑物质的输送普遍减少。拥有 Rink Isbrae 的峡湾的特殊地貌以及 Uummannaq 海槽的重要深度可能解释了尽管 WGC 减弱,但在全新世后期,该冰川对 Upernavik 海槽上的岩屑沉积的相对贡献较高。大气变暖和 7.5 到 5 cal 之间的 WGC 增强。Kyrs BP 促进了南部远端岩屑源对乌佩纳维克海槽沉积的贡献。气候和海洋环流的新冰期转变导致来自西部 GIS 冰川出口冰川的岩屑物质的输送普遍减少。拥有 Rink Isbrae 的峡湾的特殊地貌以及 Uummannaq 海槽的重要深度可能解释了尽管 WGC 减弱,但在全新世后期,该冰川对 Upernavik 海槽上的岩屑沉积的相对贡献较高。大气变暖和 7.5 到 5 cal 之间的 WGC 增强。Kyrs BP 促进了南部远端岩屑源对乌佩纳维克海槽沉积的贡献。气候和海洋环流的新冰期转变导致来自西部 GIS 冰川出口冰川的岩屑物质的输送普遍减少。拥有 Rink Isbrae 的峡湾的特殊地貌以及 Uummannaq 海槽的重要深度可能解释了尽管 WGC 减弱,但在全新世后期,该冰川对 Upernavik 海槽上的岩屑沉积的相对贡献较高。气候和海洋环流的新冰期转变导致来自西部 GIS 冰川出口冰川的岩屑物质的输送普遍减少。拥有 Rink Isbrae 的峡湾的特殊地貌以及 Uummannaq 海槽的重要深度可能解释了尽管 WGC 减弱,但在全新世后期,该冰川对 Upernavik 海槽上的岩屑沉积的相对贡献较高。气候和海洋环流的新冰期转变导致来自西部 GIS 冰川出口冰川的岩屑物质的输送普遍减少。拥有 Rink Isbrae 的峡湾的特殊地貌以及 Uummannaq 海槽的重要深度可能解释了尽管 WGC 减弱,但在全新世后期,该冰川对 Upernavik 海槽上的岩屑沉积的相对贡献较高。
更新日期:2020-08-01
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