Collaborative Research: Bear Mountain Intrusive Complex, Klamath Mountains, California: Arc Magmatism and Crustal Anatexis During a Contractional Orogeny

合作研究：加利福尼亚州克拉马斯山脉的熊山侵入杂岩：收缩造山运动期间的弧岩浆作用和地壳深熔

• 批准号: 9902807
• 负责人: Arthur Snoke
• 金额: $ 12.26万
• 依托单位: University of Wyoming
• 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: 1999-07-15 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902807&HistoricalAwards=false
• 关键词: Collaborative; Research; Bear; Mountain; Intrusive

9902807SnokeArc magmatism is generally thought to be associated with extensional deformation within the arc environment, but in some instances it can be associated with contractional deformation. In the Klamath Mountains province of California, extension related arc magmatism alternated with contraction-related magmatism, but the former resulted in calc-alkaline magmas whereas the latter was associated with distinctive K20-rich magmas. The Bear Mountain intrusive complex contains these pluton types and their contact aureoles. This study will address the kinematic and strain history, the petrography and thermobarometry of the plutons and wall rocks in order to relate magma composition to tectonic environment. Petrologic modeling will attempt to understand the formation and evolution of the pluton and contact zone, including migmatitic rocks. Results will provide clearer understanding of the links between magma composition, tectonic setting and development of strain fabrics, both for the Bear Mountain complex and other examples for arc magmatism in convergent and extensional circumstances.

9902807SnokeArc 岩浆作用通常被认为与弧环境内的伸展变形有关，但在某些情况下，它可能与收缩变形有关。 在加利福尼亚州克拉马斯山脉省，与伸展相关的弧岩浆作用与与收缩相关的岩浆作用交替出现，但前者产生钙碱性岩浆，而后者则与独特的富含 K20 的岩浆有关。 熊山侵入体包含这些岩体类型及其接触光环。 这项研究将研究岩体和围岩的运动学和应变历史、岩相学和温压测量，以便将岩浆成分与构造环境联系起来。 岩石学建模将试图了解岩体和接触带（包括混合岩）的形成和演化。 研究结果将有助于更清楚地了解熊山杂岩和其他汇聚和伸展环境下弧岩浆作用的岩浆成分、构造背景和应变结构发育之间的联系。