U-Pb Geochronology of the Wildhorse Gneiss Complex, Pioneer Mountains Core Complex, South-Central Idaho

爱达荷州中南部先锋山核心杂岩野马片麻岩杂岩的 U-Pb 地质年代学

• 批准号: 0510980
• 负责人: Paul Karl Link
• 金额: $ 2.65万
• 依托单位: Idaho State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-15 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0510980&HistoricalAwards=false
• 关键词: Pb; Geochronology; Wildhorse; Gneiss; Complex

Faculty and students from Idaho State University are engaged in integrated field, petrographic, geochemical, and geochronologic study of Neoproterozoic strata exposed in the Pioneer Mountains core complex of Idaho. Previous studies of Paleozoic strata have identified an unusual population of detrital zircons with ages of about 750 to 600 Ma. Rocks of this age are very unusual along the western margin of North America. Fieldwork has traced the apparent origin of these rocks to the Pioneer Mountains. This study utilizes student projects to determine the source of these rocks and confirm their isotopic ages. The work has implications for paleogeographic reconstructions of Rodinia and evaluation of the Snowball Earth hypothesis.

爱达荷州立大学的教职员工和学生从事爱达荷州先锋山脉核心杂岩中暴露的新元古代地层的综合野外、岩石学、地球化学和地质年代学研究。以前对古生代地层的研究已经发现了一组不寻常的碎屑锆石，年龄约为750至600 Ma。这种年代的岩石在北美西部边缘非常罕见。田野调查已将这些岩石的明显起源追溯到先锋山脉。这项研究利用学生项目来确定这些岩石的来源，并确定它们的同位素年龄。这项工作对重建罗迪尼亚的古地理和评估雪球地球假说具有重要意义。