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

美国西部大盆地古生界碳酸盐岩重磁化的起源和构造意义

• 批准号: 9118669
• 负责人: Robert Karlin
• 金额: $ 8.02万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1995-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118669&HistoricalAwards=false
• 关键词: Origin; Tectonic; Significance; Remagnetizations; Paleozoic

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

古生代末期，北美西缘由被动变为汇聚，大盆地下古生代沉积岩从内华达州南部至犹他州中西部发生再磁化。 在内华达州北部，直到三叠纪才发生重磁化。 这项研究将测试不同的再磁化时间是否是地体与北美西部边缘的不同对接时间的结果。 将确定每个碳酸盐层序的地层和面积范围以及再磁化的时间，并且将确定再磁化是正常的还是化学的。 然后，重磁化将与已知的区域构造事件相关。 这项研究的结果将提供有关重磁化过程的重要信息，并将对北美西部晚古生代的构造重建产生直接影响