Experimental Constraints on Volatiles in Subduction Zones

9973066地球上俯冲带以上的空区几乎是所有已知的爆发火山的所在地。爆炸性是由于存在的二氧化碳和水（二氧化碳和水）溶解在岩浆。这个提议是为了继续我们一直在做的关于俯冲带中二氧化碳和氢的储存和释放的研究。我们的一些工作集中在确定二氧化碳在一系列岩浆成分中的溶解度，以及h2o对这些溶解度的影响。其他实验的重点是俯冲板块中含水矿物的稳定性。这些结果涉及一系列过程，但主要目的是了解俯冲带岩浆作用的各个方面。本文拟继续开展俯冲带过程的研究工作，首先通过实验确定俯冲带条件下水合玄武岩成分中各种含水矿物的压力-温度范围；(2)通过实验确定地球60至300公里深处含水地幔物质的熔化开始和角闪岩-出平衡。这些实验将由两名博士生进行，并将成为他们论文的基础。

9973066HollowayRegions on the Earth above subduction-zones are the location of almost all known explosive volcanoes. The explosivity is due to the presence of carbon dioxide and water (C02 and H20) dissolved in the magmas. This proposal is to continue the research we have been doing on the storage and release of the C02 and H20 that occur in subduction zones. Some of our work has centered on the determination of C02 solubility in a range of magma compositions, and on the effect of H20 on those solubilities. Other experiments have focused on the stability of water-containing minerals in subducting slabs. These results bear on a range of processes, but aim primarily at understanding aspects of subduction zone magmatism. The proposed research is to continue the work on subduction zone processes by (1) Experimentally determination of the pressure-temperature range for various hydrous minerals in hydrated basalt compositions under subduction zone conditions; and (2) Experimentally determining the beginning of melting and hornblende-out equilibria in hydrous mantle material at depths of 60 to 300 kilometers in the Earth. The experiments will be carried out by two Ph. D. students and will form the basis of their dissertations.