Thermal Conductivity of Quartz and Feldspars with Application to Continental Heat Flow

建议使用光谱测量和建模对地壳矿物的热导率（k）进行为期一年的研究。这些数据将补充新的测量的斜长石的热扩散率使用激光闪光装置。这些测量将提供一个基准的PI的模型的晶格贡献对可用的可靠数据的热导率低于室温下的石英和长石，并对激光闪光测量在高T。校准后的模型将提供适合于地球中热量扩散的高温数据，并将通过状态方程约束压力依赖性。其目的是试图理解为什么最近大陆热流数据低于海洋热流数据（Pollack et al. 1993），这与高热流与高放射性含量的预期相关性相反，并且与几乎所有地球放射性元素分配到地壳中的不平衡表明几乎没有来自地幔的热量通过地壳逃逸。根据石英和长石的k（T，P）的测定，大陆地壳可以近似为包含内部加热的传导冷却模型。要求表面热通量和温度相匹配将给出将基底温度与放射性含量相关联的解决方案。将结果与先前对放射性含量（基于化学清单）和温度（基于相位关系）的独立估计进行比较，将对这些相互关联的量设定限制，从而对来自地幔的基底热流设定限制。这一结果应提供一个约束的地幔对流模型。

EAR-0125883HofmeisterA one-year investigation of thermal conductivity (k) of crustal minerals using spectroscopic measurements and modeling is proposed. The data will be supplemented with new measurements of the thermal diffusivity of a plagioclase feldspar using a laser-flash apparatus. These measurements will provide a benchmark of the PI's model for the lattice contribution against available reliable data on thermal conductivity below room temperature for quartz and feldspar, and against the laser flash measurements at high T. The calibrated model will provide high T data appropriate for diffusion of heat in the Earth, and will constrain pressure dependencies through the equation of state. The purpose is to try and understand why the most recent heat flow data from the continents is lower than that from the oceans (Pollack et al. 1993), contrary to the expected correlation of high heat flow with high radioactive contents, and to the partitioning of almost all of Earth's radioactive elements into the crust The imbalance suggests that virtually no heat from the mantle escapes through the crust. From the determination of k(T,P) for quartz and feldspars, the continental crust can be approximated by a conductive cooling model that incorporates internal heating. Requiring that the surface heat flux and temperature be matched will give solutions relating the basal temperature to the radioactive contents. Comparison of results with previous independent estimates of radioactive contents (based on chemical inventory) and of temperatures (based on phase relations) will set limits on these interrelated quantities, and thus on the basal heat flow from the mantle. This result should provide a constraint for convection models of the mantle.