钙长辉长无球粒陨石NWA 11586稀有气体及其年代学  

Noble gas and its chronology of the eucrite NWA 11586

作　　者：张川统 缪秉魁[2,3] 贺怀宇[5] 苏菲[5] 解庆林[1] ZHANG Chuan-tong;MIAO Bing-kui;HE Huai-yu;SU Fei;XE Qing-lin(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541006,China;Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology,Guilin 541006,China;Institution of Meteorites and Planetary Materials Research,Guilin University of Technology,Guilin 541006,China;Key Laboratory of Lunar and Deep Space Exploration,Chinese Academy of Sciences,Beijing 100101,China;Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541006 [2]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541006 [3]桂林理工大学陨石与行星物质研究中心,广西桂林541006 [4]中国科学院月球与深空探测重点实验室,北京100101 [5]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：《桂林理工大学学报》2021年第4期760-767,共8页Journal of Guilin University of Technology

基　　金：中国科学院战略性先导科技专项(B类)(XDB 41000000);中国博士后科学基金项目(2020M673557XB);民用航天技术预先研究项目(D020302,D020206);中国科学院月球与深空探测重点实验室开放基金项目(LDSE201907);广西自然科学基金项目(2021GXNSFBA075061);广西科技基地及人才专项(桂科AD1850007)。

摘　　要：HED族陨石来自灶神星,是研究太阳系和类地行星形成及演化的重要窗口,而研究稀有气体是了解HED族陨石和灶神星撞击历史与热事件的主要途径。本文对非角砾岩化钙长辉长无球粒陨石NWA 11586开展了稀有气体、宇宙暴露(CRE)年龄和气体保存年龄研究。稀有气体同位素表明,NWA 11586陨石He、Ne和Ar气体主要是宇宙射线成因和放射性衰变成因的;该陨石CRE年龄(38.5±4.1 Ma)与HED族陨石35~41 Ma的主要撞击溅射事件年龄相一致,故其可能在~40 Ma前从灶神星或V型小行星溅离;陨石U、Th-^(4)He(T_(4))及^(40)K-^(40)Ar(T_(40))气体保存年龄分别为1019±41 Ma和3041±77 Ma,已受到后期热事件影响而发生了重置。Howardite-Eucrite-Diogenite(HED)clan meteorites come from Vesta,and are the important window for studying the formation and evolution of the solar system and terrestrial planets.The noble gases are the key means to understand the impact and thermal history of HED meteorites and Vesta.This research work presents a detail study of the noble gas isotopes,cosmic-ray exposure(CRE)age and nominal gas retention age for the unbrecciated eucrite NWA 11586.The noble gas isotopes indicate that the He,Ne and Ar of NWA 11586 are mainly cosmogenic and radiogenic.The CRE age of this meteorite(38.5±4.1 Ma)is consistent with the ages of major impact events(35-41 Ma)of HEDs,indicating that it may be launched from Vesta or V-type asteroids at-40 Ma.The U,Th-^(4)He(T_(4))and^(40)K-^(40)Ar(T_(40))gas retention ages of NWA 11586 are 1019±41 Ma and 3041±77 Ma respectively,the reset may be caused by late thermal events.

关 键 词：HED族陨石 钙长辉长无球粒陨石 NWA 11586 稀有气体 宇宙暴露年龄 气体保存年龄 

分 类 号：P185.83[天文地球—天文学] P691