INTERRELATIONS BETWEEN THE TECTONOMORPHIC HISTORY OF THE ARCTIC AND ITS PAST ENVIRONMENTAL CHANGESPart I: Cenozoic tectonothermal evolution of North and Northeast Greenland

Wandel Hav活动带位于格陵兰岛的东北角，位于古近系尤里肯造山带的中部，以前连接西部的加拿大高北极和东部的巴伦支陆架。我们假设，尤里坎造山带影响了北极的气候演变，因为与尤里坎变形相关的地形可能形成了格陵兰岛始新世大陆冰川作用的核心。根据约44 Ma以后近海沉积物中浮冰碎屑的出现，提出了格陵兰岛大陆冰川作用的假设。在这一部分的研究中，我们的目标是通过对格陵兰北部（东部）的陆上和海上样本应用热年代学方法来测试我们假设的基本前提-即，与增强侵蚀相关的增强构造运动，从而可能在正确的时间形成地形，从而在~44 Ma开始格陵兰大陆冰川作用。在一项配套提案中，我们的目标是调查近海浮冰碎屑的来源，从而获得始新世、渐新世和中新世冰川源区和冰山路径的信息，该研究也将为其提供参考材料和数据。在尤里坎形变停止后，万德尔-哈夫活动带的构造体制转变为（反）张拉，最终导致了格陵兰岛与欧亚大陆的分离和弗拉姆海峡的开通。弗拉姆海峡形成了北冰洋与其他海洋之间唯一的深水连接，因此它的开放对北极的环境和气候演变产生了强烈的影响。先前的研究假设在中新世中期Fram海峡变宽，并将其与区域隆起和加热联系起来，这可能与北冰洋海冰覆盖从季节性到常年性的变化相吻合。在过去，这个中新世中期热构造事件不能精确地确定年代，从而抑制了与环境变化的时间相关性。然而，来自Wandel Hav地区的镜质组反射率数据表明，在尤里坎（中新世中期？）之后，沿海地区的温度足够高，可以通过热年代学分析直接确定年代。因此，本研究的第二个主要目的是破译和确定Eurekan变形之后影响Fram海峡边缘格陵兰一侧的热构造过程。

The Wandel Hav Mobile Belt is situated at the northeastern corner of Greenland and was located in the central part of the Paleogene Eurekan orogen, formerly connecting the Canadian High Arctic in the West with the Barents Shelf in the East. We hypothesize that the Eurekan orogen has influenced the climatic evolution of the Arctic in that topography associated with Eurekan deformation may have formed the nucleus for assumed Eocene continental glaciation of Greenland. Continental glaciation of Greenland was postulated based on the occurrence of ice rafted debris in offshore sediments from ~44 Ma onwards. For this part of the study, we aim to test the basic prerequisite of our hypothesis - i.e., enhanced tectonic movements associated with enhanced erosion and thus presumably topography formation at the right time to initiate continental glaciation of Greenland at ~44 Ma - by applying thermochronological dating methods to onshore and offshore samples of North(-east) Greenland. In a companion proposal – for which this study will also provide reference material and data – we aim to investigate the provenance of offshore ice rafted debris, thus obtaining information on glaciated source areas and iceberg pathways during Eocene, Oligocene and Miocene times. After Eurekan deformation ceased, the tectonic regime of the Wandel Hav Mobile Belt changed to (trans-)tension, which eventually led to the separation of Greenland from the Eurasian continent and the opening of the Fram Strait. The Fram Strait forms the only deep water connection of the Arctic Ocean with other oceans, and thus its opening strongly impacted on the environmental and climatic evolution of the Arctic. Previous studies postulated widening of the Fram Strait during the mid Miocene and related this to regional uplift and heating, which may coincide with the change from seasonal to perennial sea ice cover in the Arctic Ocean. In the past, this mid Miocene thermotectonic event could not be dated precisely, thus inhibiting temporal correlations with environmental changes. Vitrinite reflectance data from the Wandel Hav region, however, suggest post Eurekan (mid Miocene?) heating of the coastal regions at temperatures sufficiently high to allow for direct dating by thermochronological analyses. Thus, the second major aim of this study is to decipher and date thermotectonic processes that influenced the Greenland side of the Fram Strait margin subsequent to Eurekan deformation.