Feb 2008 - Feb 2009 Progress Report and Final Report for NA26215: Experimental Studies of High-Energy Processing of Proto-Planetary and Planetary Materials in the Early Solar System

Jacobsen, Stein B.

关键词: ASTEROIDS;    MIXTURES;    PROCESSING;    PROGRESS REPORT;    SOLAR SYSTEM;    TRANSIENTS;    TRAPPING High energy laser radiation;    metal-silicate mixtures;    shock-induced melting;    metal-silicate equilibration;    Earth-Moon system;    Hf-W chronology;    Richtmyer-Meshkov instability;   

DOI  :  10.2172/953482
RP-ID  :  NONE
PID  :  OSTI ID: 953482
Others  :  TRN: US201008%%462

美国|英语

来源: SciTech Connect

【 摘 要 】

The results of this project are the first experimental data on the behavior of metal-silicate mixtures under very high pressures and temperatures comparable to those of the putative Moon-forming impact experienced by Earth in its early history. Probably the most important outcome of this project was the discovery that metal-silicate interaction and equilibration during highly energetic transient events like impacts may be extremely fast and effective on relatively large scale that was not appreciated before. During the course of this project we have developed a technique for trapping supercritical melts produced in our experiments that allows studying chemical phenomena taking place on a nanosecond timescales. Our results shed new light on the processes and conditions existed in the early Earth history, a subject of perennial interest of the humankind. The results of this project also provide important experimental constraints essential for development of the strategy and technology to mitigate imminent asteroid hazard.