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 下古生界由被动沉积向汇聚沉积转变 大盆地的岩石从S重新磁化。从内华达州往西- 位于犹他州中部。 在北方内华达州，没有发生再磁化 直到三叠纪 这项研究将测试是否不同的时间 的重磁化是不同的对接时间的结果， 在北美洲西部边缘。 地层 以及重新磁化的范围和时间 每个碳酸盐岩序列的确定，并将确定 再磁化是正常的还是化学的 重新磁化 将与已知的区域构造事件有关。 的 这项研究的结果将提供重要的信息， 再磁化过程，并将直接影响到构造 晚古生代北美西部的重建