Tectonic deformation and paleostress field evolution of the western Pearya terrane, Arctic Canada

建立了几个板块构造模型，重建了盘古大陆的组合和分裂。由于数据的稀疏性和北极地质的复杂性，存在不同的模型，且这些模型具有不确定性。为了减少这些不确定性并为北极地区的地质形成建立一个整体模型，必须分析环北极褶皱和冲断带的时空演化。在这种背景下，拟议的项目是锚定的。野外区域是奇异的和复合的珍珠岩，它支配着加拿大北极高地埃尔斯米尔岛的最北端。该地体是在志留纪晚期或石炭世早期沉积到劳伦蒂亚边缘的，是了解北极地区地球动力学演化的关键因素，但对该地区构造样式的认识仍然有限，只有很少的研究对其进行了分析。研究区受奥陶纪加里东期、晚古生代埃尔斯梅里期和古近纪尤里坎期三个变形期的影响。本项目旨在通过古应力场分析，分析珠江口西部地体的变形类型，圈定其不同的变形阶段。研究结果将有助于更好地了解盘古大陆分裂和北冰洋开放前环北极沉积盆地形成时期北极地区的构造。此次考察的后勤工作将由德国联邦地质调查局（BGR）在环北极结构事件（CASE）项目框架下进行。

Several plate tectonic models were developed that reconstruct the assemblage and break-up of the supercontinent Pangea. Due to the sparse data and the complexity of the Arctic geology, different models exist and these models have uncertainties. To reduce these uncertainties and to develop a holistic model for the geological formation of the Arctic region, the spatial and temporal evolution of the circum-Arctic fold-and-thrust belts has to be analysed. In this context, the proposed project is anchored. Field area is the exotic and composite Pearya terrane, which dominates the northernmost part of Ellesmere Island, in the Canadian High Arctic. This terrane was accreted to the margin of Laurentia in Late Silurian times or in the earliest Carboniferous and is a key element for understanding the geodynamic evolution of the Arctic region, but the knowledge about the structural style of this area is still limited and has only been analysed in very few studies. The study area was effected by at least three deformation phases, the Caledonian in the Ordovician the Ellesmerian in the Late Paleozoic and the Eurekan in the Paleogene. The aim of this project is to analyse the deformation style of the western Pearya terrane and to delineate the different deformation phases based on a paleostress field analysis. The results will help to better understand the structure of the Arctic region prior to the break-up of Pangea and the opening of the Arctic Ocean with the formation of the circum-Arctic sedimentary basins. The logistics of the expedition will be carried out by the Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) in the frame of the CASE (Circum Arctic Structural Events) program.