Petrology and chemistry of Apollo 12 regolith breccias
Petrology and chemistry of Apollo 12 regolith breccias
复制标题
阿波罗 12 号风化角砾岩的岩石学和化学
DOI：
--
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
J. Laul
中科院分区：
文献类型：
--
作者：
S. Simon;J. Papike;D. Gosselin;J. Laul
报告了风化层角砾岩套件中三个大型阿波罗 12 号风化层角砾岩和从阿波罗 12 号粗粉中手工挑选的八个角砾岩的岩相、矿物化学和大宗化学数据。两个由非 KREEPy 斜长岩风化层形成的样本目前在采样点尚未发现。其中八个样品可以被认为是当地玄武岩和 KREEP 成分的混合物，以及少量的斜长岩成分。化学混合模型显示的 Mare:KREEP 比率范围从 86:7 到本质上是端元 KREEP。一个样品与其他样品不同（FeO 23.7；MgO 21.7），可能是新岩性或非代表性样品。在研究的 11 个样本中，5 个似乎是本地来源的，3 个很可能是该地点的外来样本，另外 3 个的结果尚无定论。斜长岩角砾岩由类似阿波罗 16 号的风化层形成，可能从非 KREEPy 高地向东部迁移了数百公里。或者，它们可能源自当地，由阿波罗 12 号玄武岩流下方的材料形成。
Petrographic, mineral chemical, and bulk chemical data are reported for the three large Apollo 12 regolith breccias of the regolith breccia suite and for eight breccias handpicked from Apollo 12 coarse fines. Two samples formed from non‐KREEPy anorthositic regolith not presently found at the sampling site. Eight of the samples can be considered mixtures of local basalt and KREEP components, with minor anorthositic components. Mare:KREEP ratios indicated by chemical mixing models range from 86:7 to essentially endmember KREEP. One sample is unlike the others (FeO 23.7; MgO 21.7) and may be a new lithology or alternatively a nonrepresentative sample. Of the 11 samples studied, 5 appear to be of local origin, 3 are most likely exotic to the site, and results for 3 others are inconclusive. The anorthositic breccias formed from Apollo 16‐like regolith and may have been transported over several hundred kilometers from the non‐KREEPy highlands to the east. Alternatively, they may be of local origin, formed from the material beneath the Apollo 12 basalt flows.