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A dated volcano‐tectonic deformation event in Jan Mayen causing landlocking of Arctic charr
Journal of Quaternary Science ( IF 2.3 ) Pub Date : 2021-02-11 , DOI: 10.1002/jqs.3280
Eiliv Larsen 1 , Astrid Lyså 1 , Ármann Höskuldsson 2 , Jan G. Davidsen 3 , Marie J. Nadeau 4 , Michael Power 5 , Georgios Tassis 1 , Stefan Wastegård 6
Affiliation  

We provide the first documentation of tectonic deformation resulting from a volcanic eruption on the island of Jan Mayen. Vertical displacement of about 14 m southwest of the stratovolcano Beerenberg is associated with an eruption in ad 1732 on its southeastern flank. The age of the uplift event is bracketed by radiocarbon‐dated driftwood buried by material deposited due to uplift, and by tephra from this eruption. Constraints, inferred from radiocarbon ages alone, allow for the possibility that uplift was completed prior to the ad 1732 eruption. However, the occurrence of tephra in the sediment column indicates that some displacement was ongoing during the eruption but ceased before the eruption terminated. We attribute the tectonic deformation to intrusion of shallow magma associated with the volcanic eruption. Our results complement previous studies of volcanic activity on Jan Mayan by providing precise age constraints for past volcanic activity. Also, it raises new hypotheses regarding the nature, timing and prevalence of precursor tectonic events to Jan Mayan eruptions. The uplift caused the complete isolation of a coastal lake by closing its outlet to the sea, thus landlocking the facultative migratory fish species Arctic charr (Salvelinus alpinus).

中文翻译:

扬·马延(Jan Mayen)的一个过时的火山-构造变形事件引起了北极红炭黑的内陆

我们提供了由Jan Mayen岛上的火山喷发引起的构造变形的第一份文档。的成层Beerenberg约14米西南的垂直位移与在喷发相关联的广告在其东南部侧面1732。隆起事件的年龄被放射性碳定年的浮木所包围,该浮木被隆起所沉积的物质以及火山爆发中的特非拉所掩埋。仅从放射性碳年龄推断出的限制条件允许在广告之前完成提升过程1732喷发。但是,在沉积物柱中发生的特菲拉现象表明在喷发过程中正在进行一定的位移,但在喷发终止之前已经停止了位移。我们将构造变形归因于与火山喷发有关的浅岩浆侵入。我们的结果通过为过去的火山活动提供精确的年龄限制,补充了对Jan Mayan火山活动的先前研究。此外,它还提出了有关Jan Janan火山爆发前兆构造事件的性质,时间和普遍性的新假设。隆升通过关闭其出海口使沿海湖完全隔离,从而使兼性迁徙鱼类北极species(Salvelinus alpinus)内陆。
更新日期:2021-02-28
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