Re-evaluation and extension of the Marine Isotope Stage 5 tephrostratigraphy of the Faroe Islands region: The cryptotephra record

Re-evaluation and extension of the Marine Isotope Stage 5 tephrostratigraphy of the Faroe Islands region: The cryptotephra record
复制标题

法罗群岛地区海洋同位素第 5 阶段地层学的重新评估和扩展:隐石记录

DOI:
10.1016/j.palaeo.2014.05.004
复制
发表时间:
2014
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Abbott P
Abbott P
中科院分区:
--
文献类型:
--
作者:
Abbott P

文献摘要

参考文献

被引文献

相似文献

以前对法罗群岛地区海相序列的研究已经确定了一系列在海洋同位素阶段(MIS) 5沉积的粗颗粒tephra层。在这里,我们重新评估了法罗群岛地区的MIS 5温度地层学,并重点研究了保存在海洋岩心细粒部分中的隐温度沉积。我们还将记录扩展到包含MIS 6后期和MIS 4早期的时期。密度分离技术通常用于湖泊环境下的tephra调查,但很少用于海洋沉积物,该技术用于探索细粒材料,并使用EPMA和LA-ICP-MS来确定单个tephra碎片的主要和微量元素组成。总共确定了3个地球化学成分均匀的玄武岩和3个流纹岩冰岛隐毯矿床,它们都有可能作为等时系的联系线。地球化学结果表明,冰岛的Grímsvötn火山体系是玄武岩层位的主要来源,Öraefajökull或Torfajökull体系是流纹岩矿床的可能来源。此前在法罗群岛地区的海相层序中发现了三个层位,其中两个沉积可追溯到挪威海层序。早期的MIS 4流纹岩层是最广泛的沉积,因为它可以追溯到挪威海,并向南追溯到罗克尔海槽的记录。玄武岩和流纹岩层在其他层序中未被发现,是区域地层地层的新补充。
Previous studies of marine sequences from the Faroe Islands region have identified a series of coarse-grained tephra horizons deposited during Marine Isotope Stage (MIS) 5. Here we reassess the MIS 5 tephrostratigraphy of the Faroe Islands region and focus on the cryptotephra deposits preserved within the fine-grained fraction of marine core LINK 16. We also extend the record to encompass the late MIS 6 and early MIS 4 periods. A density separation technique, commonly used for tephra investigations in lacustrine settings but rarely applied to marine sediments, is utilised to explore the fine-grained material and EPMA and LA-ICP-MS are employed to determine the major and trace element composition of individual tephra shards. In total, 3 basaltic and 3 rhyolitic Icelandic cryptotephra deposits with homogeneous geochemical compositions are identified — all of which have the potential to act as isochronous tie-lines. Geochemical results highlight that the Grímsvötn volcanic system of Iceland is the predominant source of the basaltic horizons and the Öraefajökull or Torfajökull systems are the likely sources of the rhyolitic deposits. Three of the horizons have been previously recognised in Faroe Islands region marine sequences, with two of these deposits traceable into a Norwegian Sea sequence. An early MIS 4 rhyolitic horizon is the most widespread deposit as it can be traced into the Norwegian Sea and to the south into a record from the Rockall Trough. Basaltic and rhyolitic horizons deposited during late MIS 6 have not been recognised in other sequences and represent new additions to the regional tephrostratigraphy.
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
DOI: 10.1016/s0025-3227(03)00219-6
发表时间: 2003
期刊: Marine Geology
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
格陵兰冰芯以及北大西洋和挪威海沉积物中北大西洋灰烬带 II 的非同步沉积:复杂冰期火山灰迁移的一个例子
DOI: 10.1002/jqs.1499
发表时间: 2011
影响因子: 2.3
作者:
J. Brendryen;H. Haflidason;H. Sejrup
通讯作者: H. Sejrup
微量元素微量分析
DOI: 10.1007/978-1-4613-0635-1_21
发表时间: 1990
影响因子: 4.2
作者:
C. Lyman;J. Goldstein;A. D. Romig;P. Echlin;D. Joy;D. Newbury;David B. Williams;J. Armstrong;C. Fiori;E. Lifshin;K. Peters
通讯作者: K. Peters
北欧东南海中层水在千年时间尺度上的通风变化,65-14 kyr BP
DOI: 10.1029/2008gl036563
发表时间: 2009
影响因子: 5.2
作者:
T. L. Rasmussen;E. Thomsen
通讯作者: E. Thomsen
北大西洋法罗群岛周围的第四纪沉积、边缘结构和海洋环流变化
DOI: 10.1016/j.quascirev.2006.12.005
发表时间: 2007
影响因子: 4
作者:
T. Nielsen;T. L. Rasmussen;S. Ceramicola;A. Kuijpers
通讯作者: A. Kuijpers