کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6446309 | 1640785 | 2016 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A new high-resolution Holocene tephra stratigraphy in eastern Iceland: Improving the Icelandic and North Atlantic tephrochronology
ترجمه فارسی عنوان
چینه شناسی تلسکوپ هولوسن با وضوح بالا در شرق ایسلند: اصلاح تئوفروننولوژی ایسلندی و شمال آتلانتیک
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
A new and improved Holocene tephra stratigraphy and tephrochronological framework for eastern and northern Iceland is presented. Investigations of a sediment sequence from Lake Lögurinn have revealed a comprehensive tephra record spanning the last 10.200 years. A total of 157 tephra layers have been identified, whereof 149 tephra layers have been correlated to its source volcanic system using geochemistry, stratigraphy and age. Fifteen layers have chemical composition of two affinities that possibly represent two very closely spaced eruptions. Thus, these 157 tephra layers are believed to represent 172 explosive eruptions. Nineteen tephra marker layers have been identified in the Lake Lögurinn record (G1922, A1875, V1477, V1410, H1636, K1625, Ã1362, G1354, K1262, V874, Hrafnkatla, Sn-1, Grákolla, HY, H3, H4, HÃ, LL1755 and ReitsvÃk-8 tephra markers). New potential tephra markers are the silicic Askja L (â¼9400Â cal BP), the low titanium basalt layers, LL 1774 (â¼10.150Â cal BP) and LL 1755 (â¼9990Â cal BP), assigned to Veidivötn-Bárdarbunga and the tephra layers, LL 1527.8 (â¼7850Â cal BP), LL 911.2 (â¼2370Â cal BP), LL 908.4 (â¼2350Â cal BP), LL 781.9 (â¼1930Â cal BP), LL 644.4 (â¼1480Â cal BP), not yet correlated to a source volcanic system. A silicic tephra marker layer, ReitsvÃk 8, correlated to the Fosen tephra in Norway has been identified in Lake Lögurinn. The Lake Lögurinn tephra record has been connected and integrated with the Icelandic terrestrial tephrochronology and stratigraphy through 102 tephra layers, the marine tephra stratigraphy through 39 layers and overseas through 9 tephra layers. This record is the first high-resolution tephra stratigraphical and chronological framework for the Holocene in eastern Iceland as well as the most detailed and continuous record, and has considerable potential to serve as a key section or a stratotype for the Holocene in eastern Iceland and the North Atlantic.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 150, 15 October 2016, Pages 234-249
Journal: Quaternary Science Reviews - Volume 150, 15 October 2016, Pages 234-249
نویسندگان
Esther Ruth Gudmundsdóttir, Gudrún Larsen, Svante Björck, Ãlafur Ingólfsson, Johan Striberger,