Carbon Transport in a Faulted Metapelite Terrane During Continental Collision

大陆碰撞期间断层变泥岩地体中的碳传输

• 批准号: 9980374
• 负责人: Peter Nabelek
• 金额: $ 17.84万
• 依托单位: University of Missouri-Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9980374&HistoricalAwards=false
• 关键词: Carbon; Transport; Faulted; Metapelite; Terrane

NabelekEAR-9980374This proposal is for study of carbonic fluid generation and transport in the Black Hills, South Dakota during Proterozoic metamorphism associated with the Trans-Hudson continental collision. The aim is to determine the composition and mass of fluids generated during prograde metamorphism of graphitic metapelitic from biotite to second sillimanite grade and to determine the pathways for expulsion of the fluids. Generation of carbon-bearing fluids during metamorphism of graphitic metapelites has received little attention compared to fluids generated by calc-silicate reactions, even though phase equilibria predicts that the metamorphic fluids must contain a significant carbonic component. The study will include XRD, Raman spectroscopic, and isotopic analysis of disseminated and fluid-deposited graphite over the range of grades, and will also include microthermometric, Ram spectroscopic, and stable isotope analysis of fluid inclusions in veins. The results will be interpreted in view of metamorphic reactions in the Black Hills, published graphite-fluid phase equilibria, and isotopic fractionations. The study will lead to a comprehensive model of carbonic fluid production and egress during regional metamorphic events associated with continental collisions. It will provide better understanding and quantification of the contribution of regional metamorphism to the global carbon cycle.

NabelekEAR-9980374这项建议是为了研究南达科他州布莱克山与横贯哈德逊大陆碰撞有关的元古界变质作用期间碳酸盐流体的生成和运移。目的是确定从黑云母到二级硅线石的石墨质变质岩进变质过程中产生的流体的组成和质量，并确定流体的排泄途径。与钙-硅酸盐反应生成的流体相比，石墨质变质岩变质过程中含碳流体的生成很少受到关注，尽管相平衡预测变质流体中一定含有重要的碳组分。这项研究将包括各种等级的浸染和流体沉积石墨的X射线衍射、拉曼光谱和同位素分析，还将包括对矿脉中流体包裹体的显微测温、拉曼光谱和稳定同位素分析。这些结果将根据黑山的变质反应、已发表的石墨-流体相平衡和同位素分馏来解释。这项研究将导致一个与大陆碰撞有关的区域变质事件期间碳酸盐流体产生和流出的综合模型。它将更好地理解和量化区域变质作用对全球碳循环的贡献。