The Transport Properties of Volatile-Bearing Magmatic Melts

9706075本项目涉及在400至1300oC和1bar至2000兆帕斯卡范围内测量含水岩浆液体的密度、热膨胀率和压缩率的实验。将采取两种方法：(1)在玻璃化转变温度下测量含水液体的低温密度；(2)在50-200兆帕的快速冷密封压力装置和600-2000兆帕的活塞筒装置中，测量超纯结晶石墨和商用碳涂层石英、钠长石和斜长石浮标的下沉和漂浮。这些结果将应用于研究岩浆喷发过程中熔体从源区分离和迁移以及熔体脱气和碎裂的动力学问题。

9706075 Lange This project involves experiments to measure the density, thermal expansivity and compressibility of H2O-bearing magmatic liquids between 400 and 1300oC and from 1 bar to 2000 MPa. Two approaches will be taken: (1) low temperature density measurements of hydrous liquids at their glass transition temperatures, and (2) the sinking and floating of ultra-pure crystalline graphite and commercially carbon-coated quartz, albite, and anorthite buoyancy markers in a rapid-quench cold-seal pressure apparatus between 50-200 MPa and a piston cylinder apparatus between 600-2000 MPa. The results will have application to problems of melt segregation and migration from source regions and the dynamics of melt degassing and fragmentation during explosive magmatic eruptions.