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一块新发现月球陨石MIL090036的岩相学和矿物学

【标题】一块新发现月球陨石MIL090036的岩相学和矿物学

【Title】PETROGRAPHY AND MINERALOGY OF A NEW LUNAR METEORITE MIL090036

【DOI】10.3724/SP.J.1084.2013.00342

【作者】 谢兰芳; 缪秉魁; 陈宏毅; 夏志鹏; 姚杰

【Author】 Xie Lanfang ; Miao Bingkui ; Chen Hongyi ; Xia Zhipeng ; Yao Jie

【期刊】极地研究

【Journal】ADVANCES IN POLAR SCIENCE

【期刊年份】2013

【卷】25

【期】4

【关键词】 月球陨石; MIL090036; 月球角砾岩; 岩相学; 矿物学

【Keywords】 meteorite; MIL090036; lunar breccias; petrography; mineralogy

【摘要】MIL090036是一块在南极新发现的月球陨石,属于斜长岩质月球角砾岩。本文对这块陨石开展了详细的岩石学、矿物学特征观察与研究。MIL090036月球陨石具有典型的碎屑结构。碎屑包括岩屑、矿屑和玻屑。岩屑类型有斜长岩岩屑、辉长质斜长岩岩屑、辉长岩岩屑、风化角砾岩岩屑、橄长岩岩屑、微斑熔融角砾岩岩屑、复合角砾岩岩屑等;矿屑有辉石、斜长石、橄榄石、钛铁矿等;玻屑主要为长石质。基质由玻璃质、重结晶的细粒矿物和矿屑胶结组成。辉长岩岩屑中的斜长石(An81-83)和斜长岩中的斜长石(An88-93)较其他碎屑中的斜长石(An90-98)贫钙。岩屑、矿屑和长石质玻屑中的辉石相对贫铁(Fs 12-35Wo3-44 En22-79),而含玻璃质的辉长岩岩屑中的辉石(Fs37-65Wo10-29 En21-49)与基质中的辉石(Fs18-69Wo3-45 En14-50)相对富铁。辉长岩质斜长岩中辉石成分变化范围最小(Fs24-27Wo7-14 En59-69)。矿屑橄榄石和分布于基质中的橄榄石铁镁含量(Fo57-79)相对岩屑中的橄榄石(Fo67-77) 变化范围大。橄榄石Fe/Mn比值为47-83(平均76)、辉石Fe/Mn比值为76-112(平均73),都与月球橄榄石和月球辉石一致。岩石结构、矿物模式组合和化学成分等特征表明MIL090036是来自Apollo和Luna采样范围外的样品。对MIL090036的矿物学、岩石学和化学成分的进一步研究将能够丰富我们对月表物质组成和演化的认识。

【Abstract】MIL090036 is a newly found meteorite. Belong to feldspathic polymict lunar meteorite. Here we report the detailed petrography and mineralogy of this meteorite. The breccia of MIL090036 are abandunce in quantity and type. In the MIL090036 we found primary lithic clasts (anorthosite, gabbroic anorthosite, gabbro, regolith breccia, troctolite, microporphyritic crystalline impact melt breccia). Anorthositic and quartziferous melt clasts were also observed. Major mineral fragments include pyroxenes, plagioclase, small number of olivine and ilmenite .The composition of the matrix including melt glass, fine-grained crystalline mineral and fragment of mineral (plagioclase, pyroxene, ilminite, olivine, quartz). plagioclase grains in gabbro and anorthosite are relatively poored in Ca(An81-83, An88-93)than those in other breccia (An90-98). Pyroxene grains in lithic clasts , mineral fragments and anorthositic melt clasts are relatively poored in Fe(Fs 12-35Wo3-44 En22-79), and those in quartziferous melt clasts , matrix are relatively enriched in Fe(Fs 37-65Wo10-29 En21-49 , Fs18-69Wo3-45 En14-50). Where pyroxene grains in gabbroic anorthosite show a narrow compositional range(Fs 24-27Wo7-14 En59-69). Olivine grains in mineral fragments and matrix show a wide compositional range(Fo57-79) than those in lithic clasts(Fo67-77). Fe/Mn molar ratios in olivine range from 47 to 83 with an average of 76 , and those in pyroxene vary from 76 to 112, consistend with the lunar olivine and pyroxene trend . MIL090036 is similar petrographicaiiy and geochemically to samples from Apollo16 . MIL090036thus enhances our understanding of the mineral and chemical compositions of the lunar surface.

【基金/项目】 行星冲击产生的高温高压相变反应:月球火星陨石中后成合晶的研究 ; 广西隐伏金属矿产勘查重点实验室主任基金项目(13-A-01-02)

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