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，以开发一个完全自动化的计算机程序，计算高压相平衡的碳酸盐岩的岩性，这将使输入复杂的整体组成代表俯冲带的俯冲岩性。活塞缸实验研究选定的关键平衡将限制计算和减少错误所产生的热化学数据和状态方程的不确定性。这将使PI跟踪二氧化碳排出与俯冲板的渐进深度，从而跟踪二氧化碳的演变，在前弧，亚弧和深度超过亚弧。然后，研究将有助于MARGINS计划的目标，阐明挥发物如何在收敛的边缘平衡，并最终在二氧化碳循环和全球碳循环中的俯冲作用。

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.