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金沙所有游戏网站:化学星球学术论坛--苏雪

报告地点:环境资源楼824会议室

报告时间:2023年5月15日(周一)15:00

报告人:苏雪

报告人简介:

苏雪,2019年于中国科学技术大学取得学士学位,目前在密歇根大学地球与环境科学系攻读博士学位。主要研究领域是月球科学,研究课题内容包括对阿波罗样品中月球矿物里的熔体包裹体进行高精度分析来制约月幔的水含量,对月球火山玻璃中挥发元素的分析来制约挥发元素在火山喷发过程中的行为,并结合建模来制约火山玻璃的冷却速度,等等。参与美国NASA自然基金项目和JPL高校战略合作项目(SURP)。博士在读期间在EPSL等国际一流期刊发表过论文。

报告题目:Outgassing and in-gassing of volatile elements in lunar volcanic glass beads

金沙所有游戏网站:报告内容简介

It is commonly thought that volcanic glass beads only record volatile loss during pyroclastic eruptions in the Moon. During outgassing, volatile elements within a glass bead volatilize and are lost to the ambient environment, resulting in decreasing volatile contents in the glass beads towards the surface. However, our recent work shows that many volatile elements (such as Na, K and Cu) of lunar volcanic beads are enriched near the bead surfaces and depleted in the bead interiors, forming an overall U-shaped profile. The U-shaped profile means that rather than being lost into space, those elements were gained into volcanic glass during eruptions.

We propose that the observed U-shaped profile of volatile elements was formed by initial outgassing and subsequent in-gassing of these elements in the volcanic glass beads during their formation with the presence of a local atmosphere. A quantitative model has been developed to simulate the concentration evolution in the beads and constrain the cooling history. This is the first time that in-gassing in lunar volcanic eruptions is discovered and explained.


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