Arctic Expedition CASE 19 - Pearya

在加拿大北极地区的Pearya地体代表了一个外来的地壳碎片，碰撞的北方边缘劳伦在Ellesmerian造山运动在？上泥盆统-下石炭统。它的起源，变形的运动学，以及碰撞的精确时间仍然不清楚。在国际CASE 19 - Expedition三个不同地区的构造研究中，结合地质年代学分析，主要围绕以下几个问题：（1）如何描述Ellesmerian变形的迁移和最终碰撞特征？是否存在其他的构造证据，以证明古加里东期的变形？这些是澄清导致目前板块构造格局的古陆地区较年轻的构造演化的先决条件。(2)哪种尤里卡变形也影响了Pearya地体以外的古近纪沉积序列，它们的时间是如何被限制的？这里的目标是重建古近纪的沉积和构造历史。(3)尤里卡变形对埃勒斯梅尔构造有什么影响？如何解释这种变形的背景下，与以前的研究结果，古近纪沉积序列也涉及其时间？研究结果可为北极早古生代古生物迁移提供进一步的证据。此外，他们可以帮助理解的运动学和时间的尤里卡变形（S）的北方边缘的北美大陆。因此，它们对于解释早古生代和新生代北极的大尺度板块构造具有重要意义。

The Pearya Terrane in the Canadian Arctic represents an exotic crustal fragment that collided with the northern margin of Laurentia during the Ellesmerian Orogeny in the ?Upper Devonian - Lower Carboniferous. Its origin, the kinematics of deformations, and the precise timing of collision are still unclear. During the international CASE 19 - Expedition structural studies within three different areas, followed by and combined with geochronological analyses, are based on questions with targets as follows:(1) How can the Ellesmerian deformation be characterized concerning the terrane transfer and final collision? Does additional structural evidence for the older Caledonian deformation within the terrane exist? These are prerequisites for clarifying the younger tectonic evolution in the terrane area that has led to the present plate tectonics configuration.(2) Which Eurekan deformations affected the Paleogene sedimentary successions also outside the Pearya Terrane and how can their timing be constrained? Here, the target is a reconstruction of the sedimentological and tectonic history during the Paleogene.(3) Which effects had the Eurekan deformation on the Ellesmerian structures within the terrane? How can this deformation be interpreted in context with the results of the previous studies on the Paleogene sedimentary successions also concerning its timing?The results of the studies can provide further evidence for the Early Paleozoic terrane transfer in the Arctic. Furthermore, they can contribute to the understanding of the kinematics and timing of the Eurekan deformation(s) up to the northern margin of the North American continent. Therefore, they are important for larger scale plate tectonics interpretations of the Arctic during the Early Paleozoic and Cenozoic.