讲座信息
讲座题目：Early Bombardments in the Inner Solar System - Insights from the Moon and Vesta
讲座嘉宾：祝梦华（澳门科技大学 教授）
讲座主持人：杨亚洲（中国科学院国家空间科学中心）
时间：12月29日10点
地点：线上 腾讯会议 411-8560-2478 (点此入会）
线下 中关村九章大厦A701
讲座摘要
Although we agree that the impact rate of our Solar System in the first billionyears history was substantially higher than in the last 3.5 Gyr,no impact recordson planetary surfaces could provide solid evidences on the heavy bombardmentof terrestrial planets.However,the record of these impacts can be preserved inthe geochemistry of planetary mantle and crustal samples from theconcentrations and isotopic compositions of the highly siderophile elements(HSEs).The HSE abundance in the silicate Earth and Moon provide constraints onthe impact flux to both bodies since ~100 Myr after the beginning of the SolarSystem(tCAl),while the HSE abundance in the HED meteorites provideconstraints on the impact flux since ~1 Myr after tCAl.We found that the leftoverplanetesimals from the terrestrial planet region dominate the early impacts of theterrestrial planets and the asteroid belt was never significantly more massive thantoday or rapidly lost its mass early in the Solar System history.
嘉宾介绍
| Dr.Zhu is a professor at the State Kay Laboratory ofLunar and Planetary Sciences,Macau University ofScience and Technology (MUST).He got his Ph.D.degreein computer sciences from MUST at 2010.His currentresearch focuses on the late accretion of terrestrialplanets with the constraints from the highly siderophileelements derived from the samples and meteorites,fromwhich he tries to constrain the early bombardment history of the Moon.Hisstudies aim to improve the impact history of early inner solar system as well asthe understanding of the formation and evolution of our solar system. |
