我国在南极格罗夫山发现的首块古铜钙长无球粒陨石(GRV 150277)及其外源碎屑研究  

Study on the first howardite(GRV 150277)from Grove Mountains,Antarctica and its exogenous clasts

作　　者：张川统 王潇锐 缪秉魁 夏志鹏[1,2] 陈国柱 ZHANG ChuanTong;WANG XiaoRui;MIAO BingKui;XIA ZhiPeng;CHEN GuoZhu(Institution of Meteorites and Planetary Materials Research,Key Laboratory of Planetary Geological Evolution at Universities of Guangxi Province,Guilin University of Technology,Guilin 541006,China;Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology,Guilin 541006,China)

机构地区：[1]桂林理工大学,行星地质演化广西高校重点实验室,陨石与行星物质研究中心,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,桂林541006

出　　处：《岩石学报》2023年第1期205-216,共12页Acta Petrologica Sinica

基　　金：国家自然科学基金项目(42203048);广西自然科学基金项目(2022GXNSFAA035567、2021GXNSFBA075061);中国科学院战略性先导科技专项(B类)(XDB 41000000);民用航天技术预先研究项目(D020302)联合资助.

摘　　要：HED(Howardite-Eucrite-Diogenite)族陨石及其可能母体灶神星是国际深空探测与小行星研究的热点。其中,经历了复杂撞击混合成岩作用而形成的Howardite(古铜钙长无球粒陨石),是研究灶神星表土层物质组成与演化这一国际前沿领域的主要对象。21世纪以来,中国在南极格罗夫山回收了大量陨石,这为我国行星科学的发展提供了重要的研究标本。我国目前已分类的南极陨石中发现有3块Eucrite陨石,其为研究灶神星岩浆活动提供了重要机遇。本次工作对2016年收集到的南极格罗夫山陨石GRV 150277进行了系统性岩石学与矿物学研究。研究结果表明GRV 150277具有典型的角砾结构,主要由近乎等比例的Diogenite陨石和Eucrite陨石碎屑组成,是我国在南极发现的第一块Howardite陨石。此外,GRV 150277中还可见少量的铁陨石与CM型陨石碎屑,表明灶神星表土层遭受了多种小行星撞击。GRV 150277陨石的发现及其外源碎屑的详细研究,对确定灶神星表土层物质组成与演化历史具有重要的指示意义。The Howardite-Eucrite-Diogenite(HED)meteorite clan and its potential parent body 4 Vesta are the hot spots of international deep space exploration and asteroid research.Among them,howardites formed by complex impact mixing are the main object in the international frontier field of studying the composition and evolution of Vesta regolith.Since the 21 st century,China has recovered a large number of meteorites from Grove Mountains(GRV),Antarctica,which has provided important research specimens for the development of Chinese planetary science.Three eucrites have been found among the classified Antarctic meteorites of China,which provide an important opportunity to study the magmatic activity of Vesta.In this work,a systematic petrological and mineralogical study was carried out on the newly collected GRV meteorite GRV 150277 from Antarctica in 2016.The results show that GRV 150277 has typical brecciated texture and is mainly composed of nearly equal proportions of diogenitic and eucritic clasts.Thus,it is the first howardite for China discovered in Antarctica.In addition,a small amount of iron meteorite and CM chondrite debris can be seen in GRV 150277,indicating that the Vesta regolith has experienced multiple asteroids impacts.The discovery of the GRV 150277 meteorite and the detailed study of its exogenous debris are of great instructive significance for determining the composition and evolution history of Vesta regolith.

关 键 词：格罗夫山陨石 Howardite陨石 铁陨石碎屑 CM型陨石碎屑 灶神星表土层 

分 类 号：P595[天文地球—地球化学] P691[天文地球—地质学]