کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4712961 1638301 2016 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Holocene explosive volcanism of the Jan Mayen (island) volcanic province, North-Atlantic
ترجمه فارسی عنوان
آتشفشان های انفجاری هولوسن جزایر آتشفشانی، جزیره شمالی آتلانتیک
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی


• There is a low amount of explosive volcanism from Jan Mayen, due to the size of glaciers or low activity from Beerenberg
• We describe tephra from a new eruption found in two cores and tephra from two smaller events found only in one core each
• The Vedde Ash, found in six cores by the Jan Mayen Ridge, is 1-3 cm thick, making it the thickest tephra layer in this area

The volcanic island Jan Mayen, located in the Norwegian–Greenland Sea, hosts the active stratovolcano of Beerenberg, the northernmost active subaerial volcano in the world. At least five eruptions are known from the island following its discovery in the 17th century, but its eruptive history prior to this is basically unknown. In this paper two sediment cores retrieved close to Jan Mayen have been studied in detail to shed light on the Holocene history of explosive volcanism from the Jan Mayen volcanic province. Horizons with elevated tephra concentrations were identified and tephra from these was analysed to determine major element chemistry of the tephra. The tephra chemistry was used to provide a link between the two cores and the land based tephra records from Jan Mayen Island. We managed to link two well-developed tephra peaks in the cores by their geochemical composition and age to Jan Mayen. One of these peaks represents the 1732 AD eruption of Eggøya while the other peak represents a previously undescribed eruption dated to around 10.3 ka BP. Two less prominent tephra peaks, one in each core, dated to approximately 2.3 and 3.0 ka BP, also have a distinct geochemical character linking them to Jan Mayen volcanism. However, the most prominent tephra layer in the cores located close to Jan Mayen and numerous other cores along the Jan Mayen ridge is the 12.1 ka BP Vedde Ash originating from the Iceland volcanic province. We find that the Holocene volcanism on Jan Mayen is much less explosive than volcanism in Iceland, and propose that either low amounts of explosive volcanic activity from the summit region of Beerenberg or small to absent glacier cover on Beerenberg is responsible for this.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 321, 15 July 2016, Pages 31–43
نویسندگان
, , ,