报 告 摘 要：The Earth’s engine is driven by unknown proportions of primordial energy and heat produced in radioactive decay. Unfortunately, competing models of Earth’s composition reveal an order of magnitude uncertainty in the amount of radiogenic power driving mantle dynamics. Comparison of the flux measured at large underground neutrino experiments with geologically informed predictions of geoneutrino emission from the crust provides the critical test needed to define the mantle’s radiogenic power. We predict the geoneutrino flux at the site of the Jinping Neutrino Experiment (Sichuan, China). Within 8 years, the combination of existing data and measurements from soon to come experiments, including Jinping, will exclude end-member models at the 1σ level, define the mantle’s radiogenic contribution to the surface heat loss, set limits on the composition of the silicate Earth, and provide significant parameter bounds for models defining the mode of mantle convection. The three Asian detectors,KamLAND, JUNO, and Jinping, are separated by only ~< 3000 km (1 mantle depth); thus their geoneutrino measurements may be harnessed to improve the regional crustal models.

报告人简介：Understanding the composition, structure and evolution of the Earth and the other terrestrial planets are dominant themes of my research. The differentiation of the Earth has created 3 highly stratified and distinct reservoirs (i.e., the core, the mantle-crust system, and the atmosphere-hydrosphere system). These reservoirs are in turn themselves internally differentiated. Chemical and isotopic studies of terrestrial and extra-terrestrial samples provide insights into the timing and details of the differentiation of these reservoirs. In addition to developing models for the compositions of the bulk Earth, core and silicate Earth, I use plasma mass spectrometry to analyze samples for their chemical and isotopic compositions. Data from these mass spectrometers are used to improve our understanding of the processes involved in differentiation and the timing of these events.

第205期“论坛”主请人联系方式：
陈少敏   62795757   chenshaomin@tsinghua.edu.cn