Tracing marine cryptotephras in the North Atlantic during the last glacial period: Improving the North Atlantic marine tephrostratigraphic framework
Tracing marine cryptotephras in the North Atlantic during the last glacial period: Improving the North Atlantic marine tephrostratigraphic framework
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追踪末次冰期北大西洋的海洋隐地层：改善北大西洋海洋地层框架
DOI：
10.1016/j.quascirev.2018.03.023
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发表时间：
2018
影响因子：
4
通讯作者：
Abbott P
中科院分区：
文献类型：
--
作者：
Abbott P
灰岩年代学越来越被认为是一个关键的工具，不同的古气候档案的相关性，支持年代学模型，并促进气候独立的比较气候代理。火山碎屑框架集成的远端和近端火山碎屑发生是必不可少的，这些调查提供关键的细节，其空间分布，地球化学特征，喷发源以及任何可用的年代和/或地层信息。框架还有助于避免层位的错误相关，并提供有关火山历史的重要信息。在这里，我们提出了一个全面的年代地层框架的14火山灰层位从北大西洋海洋序列跨越60-25 cal ka BP。以前发现的可见或粗粒矿床与11个新确认的火山矿床相结合，通过对广泛的海洋层序网络应用隐火山岩鉴定和表征方法进行鉴定。已使用其物理特性评估了其同位素完整性。所有层位都起源于冰岛，其中绝大多数具有来自Grímsvötn，Kverkfjöll，Hekla/Vatnafjöll和Katla火山系统的玄武岩成分。报告了新的矿点、改进的地层位置和NAAZ II的地球化学特征的改进，并扩大了FMAZ IV的范围。此外，一些重要的地球化学群体，进一步的调查可能会显示，是isoprene的报告。这个火山灰框架为这些海洋记录与格陵兰冰芯和欧洲陆地记录的相关性和同步性提供了基础，以调查末次冰期特征的阶段，速率，时间和机制控制快速气候变化。
Tephrochronology is increasingly being recognised as a key tool for the correlation of disparate palaeoclimatic archives, underpinning chronological models and facilitating climatically independent comparisons of climate proxies. Tephra frameworks integrating both distal and proximal tephra occurrences are essential to these investigations providing key details on their spatial distributions, geochemical signatures, eruptive sources as well as any available chronological and/or stratigraphic information. Frameworks also help to avoid mis-correlation of horizons and provide important information on volcanic history. Here we present a comprehensive chronostratigraphic framework of 14 tephra horizons from North Atlantic marine sequences spanning 60-25 cal ka BP. Horizons previously discovered as visible or coarse-grained deposits have been combined with 11 newly recognised volcanic deposits, identified through the application of cryptotephra identification and characterisation methods to a wide network of marine sequences. Their isochronous integrity has been assessed using their physical characteristics. All horizons originated from Iceland with the vast majority having a basaltic composition sourced from the Grímsvötn, Kverkfjöll, Hekla/Vatnafjöll and Katla volcanic systems. New occurrences, improved stratigraphic placements and a refinement of the geochemical signature of the NAAZ II are reported and the range of the FMAZ IV has been extended. In addition, several significant geochemical populations that further investigations could show to be isochronous are reported. This tephra framework provides the foundation for the correlation and synchronisation of these marine records to the Greenland ice-cores and European terrestrial records to investigate the phasing, rate, timing and mechanisms controlling rapid climate changes that characterised the last glacial period.
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北大西洋法罗群岛海洋沉积物岩心中火山灰层的地层学和分布
影响因子：
2.9
作者：
T. L. Rasmussen;S. Wastegård;A. Kuijpers;T. V. Weering;J. Heinemeier;E. Thomsen
通讯作者：
E. Thomsen
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影响因子：
2.3
作者：
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通讯作者：
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影响因子：
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作者：
I. Hall;E. Colmenero;R. Zahn;V. Peck;S. Hemming
通讯作者：
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使用流体成像技术定位湖泊沉积物中的隐叶藻
影响因子：
2.1
作者：
Robert M. D’Anjou;N. Balascio;R. Bradley
通讯作者：
R. Bradley
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影响因子：
4.6
作者：
S. Wastegård;T. L. Rasmussen
通讯作者：
T. L. Rasmussen