Experimental Studies of Earth and Planetary Materials at Extreme Conditions of Pressure and Temperature

极端压力和温度条件下地球和行星材料的实验研究

• 批准号: RGPIN-2018-05021
• 负责人: Secco, Richard
• 金额: $ 4.44万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=713238
• 关键词: Experimental; Studies; Earth; Planetary; Materials

Large scale processes of heat and mass movement deep in the interior of planets control much of what happens on the surface. The focus of Dr. Secco's research program is to bring the inaccessible deep interior of planets into the lab by measuring physical properties of core and mantle materials under simultaneous extreme pressure (0-23GPa) and temperature (220-2300K) conditions in four large volume presses one of which is the largest capacity research press in North America. Novel techniques have been developed and will be employed at high pressures to measure electrical conductivity of terrestrial planetary core mimetic Fe-S-Si solids and liquids at high temperatures as well as NH3-H2O fluids at the low temperatures of subsurface oceans of outer planetary satellites. These studies will provide critical data to address the new controversies in models of thermal convection in fluid outer cores, inner core age, geodynamo, and magnetic induction in subsurface oceans of icy satellites. Using a technique recently developed in our lab, the enigmatic origin of deep focus earthquakes will be investigated by measuring acoustic emission in phase transforming mantle olivines (Mg1-xFex)2SiO4 (0.1

行星内部深处的大规模热量和质量运动过程控制着表面发生的大部分事情。塞科博士的研究计划的重点是通过在四台大容量压力机（其中一台是北美最大容量的研究压力机）中同时测量极端压力（0- 23 GPa）和温度（220- 2300 K）条件下的地核和地幔材料的物理特性，将无法进入的行星内部深处带入实验室。新技术已经开发出来，并将在高压下用于测量高温下地球行星核模拟Fe-S-Si固体和液体的电导率，以及低温下外行星卫星地下海洋的NH3-H2O流体的电导率。这些研究将提供关键数据，以解决新的争议模型的热对流在流体外核，内核年龄，地球发电机，和磁感应在冰卫星的地下海洋。 利用本实验室最近发展的一种技术，通过测量地幔橄榄石（Mg_（1-x）Fe_x）_2SiO_4（0.1