Carbon Transport in a Faulted Metapelite Terrane During Continental Collision

Nabelekešt-9980374该提案是为了研究与trans-Hudson大陆碰撞有关的元古代变质作用期间南达科他州布莱克山的碳流体生成和输送。 目的是确定从黑云母到第二硅线石级的石墨质变质作用过程中产生的流体的成分和质量，并确定流体排出的途径。 含碳流体的生成过程中的石墨变岩变质受到很少的关注相比，由钙硅酸盐反应产生的流体，即使相平衡预测，变质流体必须包含一个显着的碳成分。该研究将包括对不同品位的浸染状和流体沉积石墨进行XRD、拉曼光谱和同位素分析，还将包括对矿脉中流体包裹体进行显微测温、拉曼光谱和稳定同位素分析。 结果将被解释在黑山的变质反应，发表的石墨流体相平衡，和同位素分馏。这项研究将导致在与大陆碰撞有关的区域变质事件期间碳流体产生和排出的综合模型。它将更好地了解和量化区域变质作用对全球碳循环的贡献。

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.