Origin and Tectonic Significance of Remagnetizations in Paleozoic Carbonates in the Great Basin of the Western U.S.

在古生代末期，北美洲西缘由被动向辐合转变，大盆地下古生代沉积岩从南内华达州到犹他州中西部被重新磁化。在内华达州北部，直到三叠纪才发生再磁化。这项研究将测试不同的再磁化时间是否是地球在北美西部边缘不同的对接时间的结果。将确定每个碳酸盐岩层序的地层和面积范围以及重新磁化的时间，并确定重新磁化是正常的还是化学的。然后将再磁化与已知的区域构造事件联系起来。研究结果将为北美洲西部晚古生代的再磁化过程提供重要信息，并对北美洲西部晚古生代的构造重建具有直接意义

At the end of the Paleozoic, the western margin of North America changed from passive to convergent, and lower Paleozoic sedimentary rocks in the Great Basin were remagnetized from S. Nevada to west- central Utah. In northern Nevada, remagnetization did not occur until the Triassic. This study will test if the different timings of remagnetization were the result of different docking times of terranes onto the western North American Margin. The stratigraphic and areal extent and the timing of remagnetization will be determined for each carbonate sequence and it will be determined if the remagnetization was normal or chemical. The remagnetization will then be related to known regional tectonic events. The results of this study will provide important information about remagnetization processes and will have direct bearing on tectonic reconstructions of western North America during the late Paleozoic