COLLABORATIVE RESEARCH: Tectonic Reconstructions of Southwestern North America

小行星9725829 美国西南部的前寒武纪和下古生代陆壳经历了广泛的古生代、中生代和新生代变形，这些变形是由各种板块相互作用引起的。 许多大型运输断层已被提出为这些年轻的事件，但试图证明或量化它们是阻碍了缺乏知识的原始空间分布的老岩石。 该项目将采用一种新的方法来确定现已分离的古近系。 最近的研究已经确定了一个1.1的花岗岩与一个非常独特的钕同位素签名，侵蚀产物，可以确定在沉积物中沉积的可疑岩石。 接近这一独特的来源，可以估计通过寻找l.1锆石碎屑和钕穗候选沉积物。 这些来自几个关键数据集的数据将有助于建立它们的原始空间关系，从而允许确定随后的平移。 结果预计将有助于解决几个区域问题，在重建美国西南克拉通。

9725829 Farmer The precambrian and lower paleozoic continental crust of southwestern United States has been involved in extensive paleozoic, Mesozoic and Cenozoic deformation caused by a variety of plate interactions. Many large-transport faults have been proposed for these younger events, but attempts to prove or quantify them is hampered by the lack of knowledge of the original spatial distribution of the older rocks. This project will utilize a new approach to establish paleo-proximity of now separated terranes. Recent studies have identified a 1.1 by granite with a very unique Nd isotopic signature, erosion products of which can be identified in sediments deposited in the suspect terranes. Proximity to this unique source can be estimated by looking for l.1 by zircon detritus and the Nd spike in candidate sediments. Such data from several key terranes will help establish their original spatial relationship thus allowing the subsequent translations to be determined. Results are expected to assist in resolving several regional problems in the reconstruction of the southwest US craton.