Collaborative Research: Integrated Geochronology and Paleomagnetism of Neoarchean-Paleoproterozoic Dikes in Wyoming, A Keystone of North American Cratons

超级大陆在地球上出现，当大陆聚集在一起时，通常在地球的一侧，由于多次构造碰撞。 超大陆过去的存在对构造科学界和整个社会都有很大的兴趣，例如追踪矿藏。 今天的大陆是盘古超大陆的碎片，它存在于恐龙的中生代时期。 几条证据表明，甚至更早的超级大陆的存在，这是本研究的主题。 这些研究人员的目标是重建27亿至21亿年前大陆碎片的排列，以确定当时是否发生了古代超大陆周期。 这项研究将在怀俄明州的所有主要山脉进行，由两位主要研究人员及其研究生和本科生在两个夏季野外采集岩石样本。 此外，这些方法和数据将被纳入针对市中心九年级学生的科学推广计划。 最后，将以计算机动画的形式说明结果，作为教育资源提供给公众。 这项研究的重点是怀俄明州，北美的一个盆地，目前是最不为人所知的，在其变化的位置通过新太古代-古元古代间隔。 研究人员将检查漂移历史，共轭边缘和超大陆重建的目的，Escherichonic年表。 在许多方面，怀俄明州是在新太古代-古元古代期间，北美盆地排列的中心基石。 这项研究将需要两种互补的方法：使用几种成熟和精确的同位素方法的地质年代学，以及含有特别难以重置的磁畴的岩石和矿物样品的古地磁学。 这些分析的结合为超大陆旋回的分析提供了一种强有力的追踪方法。 这些对时间和空间的测量将应用于来自怀俄明州现已被侵蚀的熔岩平原的古老根部的岩脉岩石。 初步数据表明，岩脉是两种研究方法紧密结合的理想目标。 这些数据已经产生了很多兴奋，从这项研究中提炼出的视极移路径可能会导致重新评估新太古代-古元古代超大陆组合。

Supercontinents arise on the Earth when the continents cluster together, typically on one side of the Earth, as a result of multiple tectonic collisions. The past existence of supercontinents is of great interest to the tectonics scientific community, and society in general, for example for the tracing of mineral deposits. The continents today are fragments of the Pangean supercontinent, which existed during the Mesozoic age of the dinosaurs. Several lines of evidence suggest the existence of even earlier supercontinents, the subject of this study. These researchers aim to reconstruct the arrangement of continental pieces between 2.7 and 2.1 billion years ago, to determine whether ancient supercontinent cycles occurred at that time. The research will be carried out in all the major mountain ranges of Wyoming, over two summer field seasons of rock sample collection by the two principal investigators and their graduate and undergraduate students. In addition, the methods and data will be incorporated into scientific outreach programs aimed at ninth-grade inner-city students. Finally, the results will be illustrated in a computer animation made available to the general public as an educational resource. The study focuses on Wyoming, one of the cratons of North America that currently is least well known in terms of its changing positions through the Neoarchean-Paleoproterozoic interval. The researchers will be examining drift histories, conjugate margins, and cratonic chronologies for purposes of supercontinental reconstruction. In many regards, Wyoming is a central keystone in the arrangement of North American cratons during the Neoarchean-Paleoproterozoic eras. The research will entail two complementary methods: geochronology using several well established and precise isotopic methods, and paleomagnetism of rock and mineral samples that contain magnetic domains that are particularly resistant to resetting. The combination of these analyses provides a powerful tracking method for the analysis of supercontinent cycles. These measurements of time and space will be applied to dike rocks from the ancient roots of now-eroded lava plains in Wyoming. The dikes are ideal targets for the close integration of the two research methods, as indicated by preliminary data. Such data have generated much excitement that refined apparent polar wander paths from this study may result in a re-evaluation of Neoarchean-Paleoproterozoic supercontinental assembly.