阿波罗-17(70017—291)月海玄武岩岩石学及矿物学研究

PETROGRAPHIC AND MINERALOGICAL STUDIES ON APOLLO-17 MARE BASALT

自1969年7月至1972年12月美国阿波罗(A)-11、12、14、15、16及17号登月舱先后6次在月球表面着陆，共采集了约380公斤月球岩石和月球土壤样品”。自1970年以后苏联月球自动站(L)16、20及24号也相继在月球上着陆并采回少量月球样品。

Petrographic and mineralogical studies on 70017-291 mare basalt indicate that the mare basalt consists principally of augite, pigeonite, plagioclase and ilmenite with minor olivine, cristobalite, metallic iron, troilite, rutile, Cr-Al-Mg ulvospinel and residual; glass. X-ray microprobe analyses of whole rock and major minerals confirm that the 70017-291 sample is a medium-grained, high-Ti mare basalt, similar to those collected by the Apollo-11 mission. Chemically, this mare basalt is characterized by its higher contents of Ti02 and FeO. Electronprobe analysis gives (weight percent) pyroxene, 51.64; plagioclase, 25.69; ilmenite 21.43; olivine < 1 and mesostasis. The sample exhi-bits a texture of plagioclase-ilmenite poikilitic basalt. According to Sm content, 70017-291 belongs to Type B of A-17 basalt.