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

发展了几个板块构造模型，重建了超大陆盘古大陆的组装和解体。由于数据的稀疏性和北极地质的复杂性，存在着不同的模型，这些模型具有不确定性。为了减少这些不确定性，并建立北极区域地质形成的整体模型，必须分析环北极褶皱冲断带的空间和时间演变。在这种情况下，拟议的项目是固定的。野外区域是异国情调的复合皮亚地体，它主宰着加拿大北极高地埃尔斯米尔岛最北端的部分。该地体是在志留纪晚期或石炭纪早期沉积于劳伦西亚边缘的，是了解北极地区地球动力学演化的关键元素，但对该地区的构造样式的认识仍然有限，只有极少数的研究对其进行了分析。研究区至少受奥陶纪加里东期、晚古生代埃尔斯梅里期和古近纪尤里坎期三期变形的影响。该项目的目的是分析西部皮尔雅地体的变形样式，并在古应力场分析的基础上划分不同的变形阶段。这一结果将有助于更好地了解在盘古大陆解体和北冰洋开放之前，随着环北极沉积盆地的形成，北极地区的结构。考察队的后勤工作将由德国联邦地质调查局(BGR)在CASE(环北极结构事件)计划的框架内进行。

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.