月球陨石稀有气体和宇宙暴露年龄研究进展与展望  

Study Progress and Prospect of Noble Gas and Cosmic Exposure Age for Lunar Meteorites

作　　者：张川统 贺怀宇[3] 缪秉魁[1,2] ZHANG Chuan-tong1,2,HE Huai-yu3 ,MIAO Bing-kui 1,2(1. Institution of Meteorites and Planetary Materials Research Guilin University of Techmology, Guilin 541004, China; 2. Key Laboratory of Planetary Geological Evolution, Guilin University of Technology, Guilin 541004, China; 3. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijiag 100029, China)

机构地区：[1]桂林理工大学陨石与行星物质研究中心,广西桂林541004 [2]桂林理工大学行星地质演化广西高校重点实验室,广西桂林541004 [3]中国科学院地质与地球物理研究所地球与行星物理重点实验室,北京100029

出　　处：《矿物岩石地球化学通报》2018年第4期588-600,638,共14页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41776196,41173077);广西研究生教育创新计划项目(YCBZ2017054)

摘　　要：稀有气体及宇宙射线暴露（CRE）年龄是研究月球陨石辐射历史的重要媒介,其能够反演陨石所经历的表土层地质过程。本文收集了月球陨石的所有稀有气体浓度、同位素比值和CRE年龄数据,结合前人研究成果进行了对比分析,结果显示,月球陨石角砾岩和非角砾岩稀有气体分别具有＂三峰三谷＂式和＂两峰＂式分配模式,且稀有气体浓度从非角砾岩、角砾岩到表土角砾岩逐渐增高;月球陨石不存在太阳高能粒子组分（SEP）,但存在太阳风分馏组分（FSW）的可能;月球陨石具有两个不同的CRE年龄,分别为指代地月转移时间的T（4π）年龄和陨石在表土层受到宇宙射线辐射累积时间的T（2π）年龄。表土角砾岩和非表土角砾岩的T（2π）年龄分别约为400-1000 Ma和28-60 Ma,而月球陨石的T（4π）年龄为（0.4±0.9）Ma;月球陨石在表土层中的埋深为0-7.5 m,其宇宙射线辐射起始年龄普遍大于T（2π）年龄。未来月球陨石稀有气体研究有望在宇宙成因稀有气体（2π）产率模型、月球原生稀有气体和紫外激光原位稀有气体测试方法方面取得进展。Noble gas and cosmic ray exposure（ CRE） age is an important technical method and medium for the radiation history study of lunar meteorites. It can reflect the regolith geological processes experienced by meteorites. To introduce and review the research status of lunar meteorite noble gas,this paper collected all noble gas concentrations,isotopic ratios and CRE ages of lunar meteorites. Combined with previous research results and comparative analyses,the following main understandings have been obtained： The brecciated and unbrecciated lunar meteorites have the ＂three peak-three valley＂and＂two-peak＂distribution modes of noble gases,respectively,and the noble gases concentrations gradually increases from non-breccia,breccia to regolith breccia. The lunar meteorites have no solar high energy particle（ SEP） component,,but may contain fractionated solar wind（ FSW） component. The lunar meteorites have two different CRE ages,which are the T（4π）ages referring to the time of the Earth-Moon transition and the T（2π）ages indicating that the accumulating time of meteorites subjected to cosmic ray radiation in the regolith. The T（2π）ages of regolith and non-regolith breccias are approximately400-1000 Ma and 28-60 Ma,respectively,whereas the T（4π）age of lunar meteorites are（ 0. 4±0. 9） Ma. The buried depth of lunar meteorites in the regolith ranges from 0 to 7. 5 m. The cosmic ray radiation initiation ages of lunar meteorites are generally greater than their T（2π）age. Finally,this paper prospects the noble gas and CRE age studies of lunar meteorites,and proposes that in the future lunar meteorite noble gas researches are expected to be innovative in the （2π） production rate model of cosmogenic noble gas,indigenous noble gas on the moon and the UV laser in situ noble gas analysis method.

关 键 词：月球陨石 表土层 稀有气体 CRE年龄 展望 

分 类 号：P185.83[天文地球—天文学]