CAJ | 학술논문

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％，En25-83 Fs7-43 Wo2-45）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两种。 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。
MIL 090070운석시2009년미국남겁운석수심항목（ANSMET）재남겁횡단산맥미륵산구（Miller Range）발현적일괴월구운석，속우사장암질월표각력암。타구유전형적쇄설결구，주요유암설、정설、파설화세립기질조성。암설이복합사장암질암설화사장암암설위주，기차위휘장암질사장암암설、휘장암암설、휘장소장암암설、휘장암질감장암암설화감람휘장암암설등。정설유보통휘석、역변휘석、사장석、첨정석、석영화태철광등광물。파설주요위사장석질적파설，정세장혹만곡조상，다구렬문。 MIL 090070운석적광물조성주요위사장석（86 vol％， An92-99）、감람석（6 vol％，Fo53-89）、휘석（7 vol％，En25-83 Fs7-43 Wo2-45）이급소량적첨정석、태철광화석영등；기중，휘석유단사휘석화사방휘석량충。 MIL 090070운석중감람석화휘석적Fe-Mn치분포명현불동우지구、화성、금성화소행성적양품，기본락재월구암석범위。 MIL 090070운석재다기차충격화효결작용하，암설적광물성분화립도불단변화，암설류형경다양，경복잡。기우MIL 090070운석적암석광물학특정、쇄설류형급결구적특정등연구，가이진일보봉부아문대월구물질적형성급월암-월양연화과정적인식。
MIL 090070, a new lunar meteorite found in 2009, is a lunar highland anorthosite .It has a typical breccia texture that consists mainly of lithic , mineral and glassy clasts in a fine-grained matrix.Its lithic clasts include anorthositic polymicts , anorthosite , gabbro , gabbroic norite , gabbroic troctolite , gabbroic anorthosite and olivine-gabbro .Mineral clasts include augite , pigeonite , plagioclase , spinel , quartz and ilmenite .The glassy clasts are anorthositic .Its shapes are usually thin plate-like and bending plate-like with numerous fractures .The mineral as-semblage is mostly plagioclase ( 86 vol%, An92-99 ) , olivine ( 6 vol%, Fo53-89 ) , pyroxene ( 7 vol%, En25-83 Fs7-43 Wo2-45 ), spinel, ilmenite and silica.In addition, the pyroxene has two kinds of augite (En25-63 Fs7-43 Wo6-45) and pigeonite (En55-83 Fs13-41 Wo2-5).The Mn to Fe values of olivine and pyroxene plot mostly in the ar-ea of rocks with a lunar-origin, which is far from those of Earth , Mars, Venus and main-belt asteroids .MIL 090070 experienced many shock events and is cemented by shock-induced glassy breccias .Therefore , the mineral composition and grain size of the lithic clasts has changed gradually and the lithic clast types became more varied and complicate during the shock events .Examination of the petrology of MIL 090070 , including clast types and tex-tural features , will improve understanding of the process of lunar regolith formation .