Re-Os Isotope Systematics of the Columbia River Basalt Group: A Pilot Study

9405222切斯利该项目有两个主要目标：1)利用Re-Os测年系统测试年轻岩石高精度地质年代学的潜力；2)调查溢流玄武岩形成过程中大陆地壳与地幔的参与程度。PIS将通过对美国西部的大陆洪水玄武岩进行系统调查来实现这些目标。这些研究的结果将对利用Re-Os同位素系统作为计时器和研究溢流玄武岩形成过程中地幔-地壳相互作用的程度具有重要意义。除了显著增加我们对地幔和地壳Re-Os同位素特征的了解外，所产生的数据还将增强我们对Re-Os系统的地质年代学潜力的理解，并应提供与溢流玄武岩形成有关的关键信息。

9405222 Chesley The project has two main goals: 1) to test the potential for high-precision geochronology on young rocks using the Re- Os dating system; and 2) to investigate the degree of involvement of the continental crust with the mantle during the formation of flood basalts. The PIs will accomplish these goals by undertaking a systematic investigation of the continental flood basalts in the western United States. Results from these investigations should bear significantly on the use of Re-Os isotopic system as a chronometer and for examining the degree of mantle-crust interaction during the formation of flood basalts. In addition to adding significantly to our knowledge of the Re-Os isotopic characteristics of the mantle and crust, the resulting data will enhance our understanding of the geochronologic potential of the Re-Os system and should provide critical information pertaining to the formation of flood basalts.