A Reexamination of the Ballooning Plutons Hypothesis

重新审视气球膨胀的岩体假说

• 批准号: 8916340
• 负责人: Scott Paterson
• 金额: $ 10.09万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-02-15 至 1992-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916340&HistoricalAwards=false
• 关键词: Reexamination; Ballooning; Plutons; Hypothesis

Emplacement of magmas represents one of the major processes in orogenic belts for transferring heat and materials from mantle and lower crustal levels. One of the accepted models for the forceful emplacement of plutons is that of "ballooning" or in situ inflation of a diapir. However, many of the features used to support ballooning can also develop during other types of emplacement. This project will re-examine several classic plutons thought to have formed by ballooning using modern micro- structural analysis and porphyroblast-matrix relationships to develop and constrain thermo-mechanical models for each. The results from this study will have important implications for the emplacement of granitoids, particularly the nature and timing of deformation/metamorphism in orogenic belts, and for the process of transferring heat and magma in the crust.

岩浆侵位是造山带从地幔和下地壳传递热量和物质的主要过程之一。公认的一种强力侵位模式是底辟的“膨胀”或原地膨胀模式。然而，许多用于支持气球的特征也可以在其他类型的就位过程中发展。这个项目将使用现代微观结构分析和成斑岩-基质关系来重新检查几个被认为是由气球形成的经典深成岩，以开发和约束每一个的热机械模型。这一研究结果将对花岗岩类的侵位，特别是造山带变形/变质作用的性质和时间，以及地壳内热和岩浆的传递过程具有重要的意义。