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

提供资金用于开发全自动计算机程序，以计算含碳酸盐岩性的高压相平衡，这将使代表俯冲带岩性的复杂主体成分得以输入。活塞筒对选定的关键平衡的实验研究将限制计算，并减少热化学数据和状态方程中的不确定因素造成的误差。这将使PI能够跟踪俯冲板块中二氧化碳逐级深度的排放，从而跟踪前弧区、次弧区和次弧区以外深度的二氧化碳演化。然后，这项研究将通过揭示挥发物如何在收敛的利润率中平衡，并最终揭示俯冲在二氧化碳循环和全球碳循环中的作用，为利润率计划的目标做出贡献。

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.