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

加拿大北极地区皮尔亚地体西部的构造变形和古应力场演化

• 批准号: 388373716
• 负责人: Dr. Christian Brandes
• 金额: --
• 依托单位: Institut für Geologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/388373716?language=en
• 关键词: Tectonic; deformation; paleostress; field; evolution

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.

几个板块构造模型被开发出来，重建了超大陆盘古大陆的组合和分裂。由于数据稀少和北极地质的复杂性，存在不同的模型，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冲断带的时空演变。在此背景下，拟议的项目是锚。田野区是异国情调和复合Pearya e，占主导地位的埃尔斯米尔岛的最北端，在加拿大高北极地区。这是在晚志留世或早石炭纪增生到劳伦大陆的边缘，是了解北极地区的地球动力学演化的一个关键因素，但有关该地区的构造样式的知识仍然有限，只有在很少的研究中进行了分析。研究区至少经历了三个变形期，即奥陶纪加里东期、晚古生代埃尔斯麦期和古近纪尤里卡期。本项目的目的是在古应力场分析的基础上，分析西秦岭的变形样式，并划分不同的变形阶段。研究结果将有助于更好地了解泛大陆裂解和北冰洋开放与环北极沉积盆地形成之前北极地区的结构。探险的后勤工作将由Bundesanstalt für Geowissenschaften und Rohstoffe（BGR）在CASE（Circum Arctic Structural Events）计划的框架内进行。