Faroe Marine Ash Zone IV: a new MIS 3 ash zone on the Faroe Islands margin

Faroe Marine Ash Zone IV: a new MIS 3 ash zone on the Faroe Islands margin
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法罗海洋灰烬区 IV:位于法罗群岛边缘的新 MIS 3 灰烬区

DOI:
10.1144/sp398.3
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发表时间:
2014
影响因子:
4.6
通讯作者:
T. L. Rasmussen
T. L. Rasmussen
中科院分区:
医学3区
文献类型:
--
作者:
S. Wastegård;T. L. Rasmussen

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摘要通过对法罗群岛边缘岩心的分析,发现了MIS3玄武岩特弗拉岩层。在一些记录中,苔藓层厚达20厘米。在第一次主要的下沉事件之后,人们认为特弗拉主要是被海底洋流沉积和重新分配的。地球化学分析表明,火山灰岩相对不受异质火山灰颗粒的干扰,未混合。峰值出现在地理信息系统(格陵兰岛间)12的下部,我们建议将这一新的Tephra Faroe海相火山灰第四区(FMAZ IV)命名为FMAZ IV,这是遵循法罗群岛边缘以前发现的火山灰带的命名方法。对特弗拉的地球化学分析表明,它与冰岛南部东部火山带的Grímsvötn火山系统有密切联系。4个独立年龄模型的FMAZ IV的平均年龄为46800±1000岁BP。我们认为,在雷克雅那海脊上发现的V5火山灰带与FMAZ IV有关。补充材料:在法罗北部边缘和法罗-设得兰海峡中部的岩芯中,FMAZ IV中的Tephra的单颗粒分析可在http://www.geolsoc.org.uk/SUP18714获得
Abstract A basaltic tephra layer from MIS 3 has been discovered by analysis of cores from the Faroe Islands margin. The tephra layer appears up to 20 cm thick in some records. After the first main fall-out event the tephra is believed to be mainly deposited and redistributed by bottom currents. Geochemical analyses suggest that the tephra is relatively undisturbed by allochtonous tephra grains and unmixed. The peak occurrences are in the lower part of GIS (Greenland Interstadial) 12 and we suggest naming this new tephra Faroe Marine Ash Zone IV (FMAZ IV), following the nomenclature adopted for previous ash zones found on the Faroe Islands margin. Geochemical analyses of the tephra show affinities with the Grímsvötn volcanic system in the Eastern Volcanic Zone in south Iceland. The average age of FMAZ IV from four independent age models is 46 800±1000 years BP. We suggest that the V5 ash zone, found on the Reykjanes Ridge is a correlative to the FMAZ IV. Supplementary material: Single-grain analyses of tephra from FMAZ IV in cores from the northern Faroe margin and the central Faroe-Shetland Channel are available at http://www.geolsoc.org.uk/SUP18714
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DOI: 10.1098/rsta.2010.0063
发表时间: 2010
期刊: Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
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DOI: 10.1016/j.quascirev.2011.05.001
发表时间: 2012-03-12
影响因子: 4
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