Quantification of Metamorphic Decarbonation and CO2 Degassing in Subduction Zones: Implications to Fluid Fluxes, Volatile Recycling and the Global Carbon Cycle

俯冲带变质脱碳和二氧化碳脱气的量化：对流体通量、挥发物回收和全球碳循环的影响

• 批准号: 9975231
• 负责人: Derrill Kerrick
• 金额: $ 30.8万
• 依托单位: Pennsylvania State Univ University Park
• 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: 1999-08-15 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9975231&HistoricalAwards=false
• 关键词: Quantification; Metamorphic; Decarbonation; CO2; Degassing

Funds are provided to develop a fully automated computer program to calculate high-pressure phase equilibria of carbonate-bearing lithologies that will enable input complex bulk compositions representative of subducted lithologies at the subduction zones. Piston cylinder experimental studies of selected key equilibria will constrain the computations and reduce errors arising from uncertainties in thermochemical data and equations of state. This will enable the PIs to track carbon dioxide expulsion with progressive depth in subducted slabs and thus track the evolution of carbon dioxide in forearcs, subarcs and at depths beyond subarcs. Then study will contribute to the MARGINS program objectives by shedding light on how the volatiles are balanced across convergent margins and ultimately to the role of subduction in carbon-dioxide recycling and the global carbon cycle.

该项目为开发一个全自动计算机程序提供了资金，用于计算含碳酸盐岩性的高压相平衡，从而能够输入代表俯冲带岩性的复杂整体成分。选定关键平衡的活塞缸实验研究将约束计算并减少热化学数据和状态方程不确定性引起的误差。这将使pi能够跟踪俯冲板块中随着深度的增加而排出的二氧化碳，从而跟踪前弧、次弧以及次弧以外深度的二氧化碳演化。然后，研究将通过揭示挥发物如何在收敛边缘平衡，并最终揭示俯冲在二氧化碳循环和全球碳循环中的作用，从而有助于实现边际项目的目标。