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南极MIL 090070月球陨石的岩石矿物学特征

【标题】南极MIL 090070月球陨石的岩石矿物学特征

【Title】PETROLOGICAL AND MINERALOGICAL CHARACTERISTICA OF LUNAR METEORITE MIL 090070 FROM ANTARCTICA

【DOI】10.3724/SP.J.1084.2013.00329

【作者】 姚杰; 缪秉魁; 陈宏毅; 谢兰芳; 夏志鹏

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

【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; MIL 090070; 高地斜长岩; 月壤

【Keywords】 lunar meteorite; MIL 090070 highland anorthosite; lunar regolith

【摘要】MIL 090070陨石是2009年美国南极陨石搜寻项目(ANSMET)在南极横断山脉米勒山区(Miller Range)发现的一块月球陨石,属于斜长岩质月表角砾岩。它具有典型的碎屑结构,主要由岩屑、晶屑、玻屑和细粒基质组成。岩屑以复合斜长岩质岩屑和斜长岩岩屑为主,其次为辉长岩质斜长岩岩屑、辉长岩岩屑、辉长苏长岩岩屑、辉长岩质橄长岩岩屑和橄榄辉长岩岩屑等。晶屑有普通辉石、易变辉石、斜长石、尖晶石、石英和钛铁矿等矿物。玻屑主要为斜长石质的玻屑,呈细长或弯曲条状,多具裂纹。MIL 090070陨石的矿物组成主要为斜长石(86 vol%,An92—99)、橄榄石(6 vol%,Fo53—89)、辉石(7 vol%,En25—83Fs7—43Wo2—45),以及少量的尖晶石、钛铁矿和石英等;其中,辉石有单斜辉石和斜方辉石二种。MIL 090070陨石中橄榄石和辉石的Fe-Mn值分布明显不同于地球、火星、金星和小行星的样品,基本落在月球岩石范围。MIL 090070陨石在多期次冲击和胶结作用下,岩屑的矿物成分和粒度不断变化,岩屑类型更多样,更复杂。基于MIL 090070陨石的岩石矿物学特征、碎屑类型及结构的特征等研究,可以进一步丰富我们对月球物质的形成及月岩—月壤演化过程的认识。

【Abstract】 MIL 090070 is a new lunar meteorite that found in 2009, it’s a lunar highland anorthosite. It has a typical breccias texture which consists mainly of lithic clasts, mineral clasts, glassy clasts and fine-grained matrix. Its lithic clasts include anorthositic polymict clast anorthosite clast, gabbro clast, gabbroic norite clast, gabbroic troctolite clast, gabbroic anorthosite clast and olivine-gabbro clast. And there are mineral clasts of augite, pigeonite, plagioclase, spinel, quartz and ilmenite et al. The glassy clasts are anorthositic, its shapes usually are thin plate-like and bending plate-like and there are a lot of fractures in them. The mineral assemblage is plagioclase (86vol%,An92—99), olivine(6vol%,Fo53—89), pyroxene(7vol%,En25—83Fs7—43Wo2—45), spinel, ilmenite and silica et al. In addition, the pyroxene has two kinds of augite(En25—63Fs7—43Wo6—45)and pigeonit(En55—83 Fs13—41Wo2—5). The Mn to Fe values of olivine and pyroxene plot mostly in the area of the moon-origin rocks which are far from those of the earth, the mars, the venus and the asteroid. MIL090070 experienced many shock events and cemented by the shock-induced glassy breccias. Then the mineral composition and grain size of the lithic clasts changed gradually and the lithic clast types became more varied and complicate during the shock events. The study on petrology of MIL 090070 including clast types and texture features will help to get insight of the process of formation of the lunar regolith.

【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(YCSZ2013074)

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