德沃尼-密西西比岩与斯瓦尔巴德的扩展性崩有关:对辐射堤群的含义
Jean-Baptiste P Koehl1,2, Sebastian Tappe3, Gillian R Foulger4
1Earth and Planetary Sciences, McGill University Faculty of Science, Montreal, Québec, H3A 0E8, Canada.
Open research Europe
|January 27, 2025
概括
这项研究揭示了斯瓦尔巴德岛的广泛的中代纪-密西西比河流岩,地震数据证实了这一点. 这些与科拉 - 尼泊尔大火山区相关的入侵,可能沿着结构弱点而不是地幔羽毛形成.
科学领域:
- 地质科学 地质科学
- 火山学 火山学是一门学科.
- 构造学 构造学 构造学 构造学
背景情况:
- 斯瓦尔巴德的古老生态岩在斯瓦尔巴德的古老生态岩由于有限的表面暴露而被研究不足.
- 之前的研究主要集中在中生代-中生代的岩历史上.
研究的目的:
- 为了调查在斯瓦尔巴德东部的地下古老生态时期的岩入侵.
- 描述这些入侵的时间,位置和来源.
主要方法:
- 来自斯瓦尔巴德东部的2D地震反射数据的分析.
- 对螺旋粒和金石辅助矿物质的地化学分析.
主要成果:
- 地震证据显示,斯皮茨伯根东部的西浸式中代纪-密西西比纪边缘有地震证据.
- 边缘入了经过重新处理的新原生代推力系统,并被较年轻的沉积岩层覆盖.
- 侵袭显示与富含钻石的金伯石有化学亲和关系,并与区域的德沃尼-碳化时期延伸相关的岩有关.
结论:
- 呈现了斯瓦尔巴德中 Devonian-Mississippian magmatism 的第一个证据.
- 侵入可能利用了先前存在的结构弱点 (结构遗传),而不是与羽毛相关的升起.
- 大火山性省份的位置模式可以通过结构遗传来解释.
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