MRI: Multiple Episodes of Fluid-Rock Interaction in Meta- Anorthosite Northwest of the Idaho Batholith

MRI：爱达荷基岩西北部变斜长岩中多次发生的流体-岩石相互作用

• 批准号: 8904032
• 负责人: Claudia Mora
• 金额: $ 7.22万
• 依托单位: University of Texas at El Paso
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-08-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904032&HistoricalAwards=false
• 关键词: MRI; Multiple; Episodes; Fluid; Rock

The Boehls Butte anorthosite is exposed within the broad border zone of the northern Idaho batholith and has experienced multiple episodes of fluid-rock interaction, including magmatic, regional metamorphic and meteoric-hydrothermal events. This study will examine the stable isotopic and geochemical effects of superimposed fluid-rock interaction on the anorthosite and metasediments at its contact. The objectives of this study are (1) to differentiate the isotopic and geochemical effects of post-metamorphic and synmetamorphic fluid-rock interaction, (2) to constrain the relative contributions of igneous, metamorphic and hydrothermal processes to the development of unique mineralogies and isotopic compositions in the anorthosite and (3) to determine the extent to which regional metamorphism was accompanied by, or merely overprinted by, hydrothermal fluid convection associatated with batholith intrusion. Fluid-rock interaction will be characterized by a combine study of stable isotopes, fluid inclusions, mineral-fluid equilibria and trace element geochemistry. The results will constrain the depth, magnitude and timing of convective fluid flow through metamorphic rocks in the border zone of the batholith, constraining the efficacy of deep-seated fluid convection as a dynamic process in regional metamorphism.

Boehls Butte Anorthose暴露在爱达荷州北部浴位的广阔边界区域内，并经历了多次流体岩石相互作用，包括岩浆，区域变质和陨石热热事件。 这项研究将检查叠加的流体岩石相互作用对坡度和定质剂接触时的稳定同位素和地球化学作用。 这项研究的目的是（1）区分后型和突触型流体摇滚互动的同位素和地球化学作用，（2）约束火成岩，变质和热液过程对独特矿物质以及独特矿物质的发展的相对贡献坡度和（3）中的组成，以确定区域变质的伴随或仅被水热流体对流所覆盖的程度与Batholith Intrusion相关的程度。 流体岩石相互作用的特征是对稳定的同位素，流体包含，矿物流体平衡和痕量元素地球化学的联合研究。 结果将限制对流流体流经浴力石边界区域的变质岩石的深度，幅度和时机，从而限制了深座的流体对流的疗效作为区域变质中的动态过程。