Evolution of the central West Greenland margin and the Nuussuaq Basin: Localised basin uplift along a stable continental margin proposed from thermochronological data
Evolution of the central West Greenland margin and the Nuussuaq Basin: Localised basin uplift along a stable continental margin proposed from thermochronological data
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格陵兰西边缘中部和努苏瓦克盆地的演化：根据热年代学数据提出的沿稳定大陆边缘的局部盆地隆起
DOI：
10.1111/bre.12301
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发表时间：
2018
期刊：
影响因子：
3.2
通讯作者：
Roderic Brown
中科院分区：
文献类型：
--
作者：
S. Jess;R. Stephenson;Roderic Brown
新生代晚期通常被认为是西格陵兰大陆边缘（36 - 2百万年）广泛发生间歇性构造隆升的时期，这与北大西洋其他边缘地区，如挪威、东格陵兰和英国的情况类似。本研究利用贝叶斯建模方法以及与磷灰石内辐射损伤相关的新概念，重新审视并重塑了来自西格陵兰中部和白垩纪努苏阿克盆地的陆上热年代学数据。这些新的热历史表明，在中生代和新生代期间，该边缘南部区域发生了缓慢而持久的冷却，而努苏阿克盆地内部的数据显示在晚白垩世/古近纪经历了再加热，然后冷却至今。结果表明，该南部边缘在新生代晚期没有发生显著的隆升，而努苏阿克盆地的冷却与盆地地层中所描述的事件一致，并且意味着在火山活动期间发生了隆升，岩石圈剥蚀后的均衡响应提升了现代地形。这些结果意味着该地区的重要构造运动在约45百万年时停止，但在如何处理低温热年代学数据以及我们对被动大陆边缘裂谷后演化的理解方面具有更广泛的影响。
The Late Cenozoic is typically considered a time of widespread episodic tectonic uplift along the West Greenland continental margin (36–2 Ma), similar to other margins across the North Atlantic, such as Norway, East Greenland and the UK. The present study re‐examines and remodels onshore thermochronological data from central West Greenland and the Cretaceous Nuussuaq Basin, utilising a Bayesian modelling approach and new concepts related to radiation damage within apatite. These new thermal histories indicate that slow‐protracted cooling has occurred across the southern extent of the margin during the Mesozoic and Cenozoic, whereas those from within the Nuussuaq Basin display reheating through the Late Cretaceous/Palaeogene and cooling to present. Results suggest that no significant Late Cenozoic uplift has occurred along the southern margin, while cooling in the Nuussuaq Basin is consistent with events outlined in the basin's stratigraphy and implies uplift during volcanism and an isostatic response to the unroofing of the lithosphere has elevated the modern topography. These results imply significant tectonism in the region ceased by ~45 Ma, yet have wider implications regarding how low temperature thermochronology data are treated and our understanding of the postrift evolution of passive margins.
影响因子：
8.9
作者：
C. H. Kasanzu
通讯作者：
C. H. Kasanzu