Collaborative Research: Post-Penokean Crustal Stabilization in the Lake Superior Region, North-Central United States

合作研究：美国中北部苏必利尔湖地区后本诺克纪地壳稳定

• 批准号: 9902762
• 负责人: W. Randall Van Schmus
• 金额: $ 11.35万
• 依托单位: University of Kansas Center for Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902762&HistoricalAwards=false
• 关键词: Collaborative; Research; Post; Penokean; Crustal

9902762Van SchmusContinental interiors commonly remain stable for long periods of geologic time, unaffected by tectonism even when their plate margins are active. Yet, these rocks bear clear evidence of extensive but ancient tectonic activity. Just how this transition from active tectonism and associated magmatism to a stable craton ("cratonization") was accomplished is controversial. This project will study precambrain rocks in the Lake Superior region that may produce data to discriminate between several current concepts or models for this process. The age pattern and duration of post-Penokean granites vary between models and age dates from a number of plutons will be an important component of the study. Results are expected to document the transition from active tectonism to stabilization of the craton for the Lake Superior example, which will be of considerable importance in understanding this process in other cratons.

大陆内部通常在很长一段地质时期内保持稳定，即使在板块边缘活动时也不受构造运动的影响。然而，这些岩石提供了广泛而古老的构造活动的明确证据。这种从活跃构造和相关岩浆作用到稳定克拉通（克拉通化）的转变是如何完成的还存在争议。该项目将研究苏必利尔湖地区的前寒武纪岩石，这些岩石可能会产生数据，以区分这一过程的几种现有概念或模型。后佩诺kean花岗岩的年龄模式和持续时间因模式而异，许多岩体的年龄数据将是研究的重要组成部分。结果有望记录苏必利尔湖克拉通从活动构造到稳定的转变过程，这对理解其他克拉通的这一过程具有重要意义。