CAREER: The Buoyancy Drive of Carbonatite Melts in the Lithosphere

9508133兰格尽管有压倒性的证据表明碳酸盐熔体在地幔中作为交代剂的作用，但这些熔体的物理性质很难受到约束。虽然碳酸盐岩熔体具有极低的粘度，但其密度和可压缩性(特别是作为组成的函数)是完全未知的。本研究的研究目标是首次直接测量多种多元(Caco vya1 3-MgCO3-FeCO3-SrCO3-BaCO3-Na2CO3-K2CO3)熔体在较宽的温度(1000-17000 oC)和压力(0-35 kbar)范围内的密度、热膨胀和可压缩性。在开发出适用于这一七组分系统的模型方程后，实验将扩展到含有溶解的SiO_2、P_2O_5和F的碳酸盐岩液体。长期教学目标包括：积极招募、建议和支持本科生从事高级论文的研究；教授高年级必修的岩石学课程，使学生能够实践微积分和热力学对与岩浆作用和变质作用有关的宏观构造问题的应用；每年举办夏令营；开发一门新的入门课程，展示为什么地质知识对于了解墨西哥这样的发展中国家的政治和经济结构具有重要意义。Vya1

9508133 Lange Despite the overwhelming evidence for the role of carbonatite melts as metasomatic agents in the mantle, the physical properties of these melts are poorly constrained. Although carbonatite melts are known to have extremely low viscosities, their density and compressibility (particularly as a function of composition) are completely unknown. The research goal of this study is to provide the first direct measurements of density, thermal expansion and compressibility on a wide variety of multicomponent (CaCO vya1 3-MgCO3-FeCO3-SrCO3-BaCO3-Na2CO3-K2CO3) melts over a wide range of temperature (1000-17000oC) and pressure (0-35 kbars). After developing a model equation appropriate to this seven-component system, experiments will be extended to carbonatite liquids containing dissolved SiO2, P2O5, and F. The long-term teaching goals include: the active recruitment, advising and support of undergraduates to pursue research for a senior thesis; teaching an upper division, required petrology course that allows the students to practice the application of calculus and thermodynamics to big-picture, tectonically-related problems of magmatism and metamorphism; teaching summer filed camp each year; development of a new introductory course that will demonstrate why a knowledge of geology has implications for understanding the political and economic structure of a developing country, like Mexico. vya1