Electron microprobe analyses of pyroxenes, plagioclases & ilmenites from Apollo 11 lunar samples

The data presented in this paper consist of complete analyses of pyroxenes, plagioclases, and ilmenites from Apollo 11 samples not previously published (however, they were used in figures in the paper by Keil, Bunch, and Prinz, 1970). Since these analyses will be of importance to those persons evaluating Apollo 11 as well as future lunar samples, it was deemed appropriate to make them available to all workers. Some of the analyses listed in the present report total to < 99 or >101 weight percent. It is believed that this is largely due to extreme zoning of the respective minerals and the difficulties in positioning the electron beam to exactly the same spot on the mineral after each run. The sample numbers, methods of preparation and study are presented in Keil, Bunch, and Prinz, 1970. The conclusions drawn from study of these, as well as other minerals, are also presented in that publication. Electron microprobe analyses were made at The University of New Mexico and at NASA Ames Research Center, Moffett Field, California. We greatly appreciate the assistance of Messrs. G. Conrad, J. Erlichman, R. Geitgy, F. Busche, and J. Rasho in the electron microprobe work, and of Mrs. J. Etheridge, Mr. and Mrs. R. Taylor, and Miss M. Busch in the data reduction. This work is supported in part by NASA contract NAS9-9365 (Klaus Keil, Principal Investigator).

本论文所呈现的数据，为此前未公开发表的阿波罗11号（Apollo 11）样品中辉石（pyroxenes）、斜长石（plagioclases）与钛铁矿（ilmenites）的完整分析结果——不过这些数据曾被用于Keil、Bunch及Prinz于1970年发表的论文配图中。鉴于这些分析结果对评估阿波罗11号样品及后续月球样品的科研人员具有重要参考价值，我们认为将其公开供所有研究者使用是恰当的。本报告中收录的部分分析结果的总质量百分含量低于99%或高于101%，我们认为该现象主要源于对应矿物的强烈分带结构，以及每次测试后难以将电子束精准定位至矿物上的同一测试点。样品编号、制样方法与分析方法已在Keil、Bunch及Prinz 1970年的论文中详细说明，基于这些矿物及其他矿物研究所得到的结论也刊载于该出版物中。电子探针显微分析（electron microprobe analyses）分别在新墨西哥大学（The University of New Mexico）以及位于加利福尼亚州莫菲特菲尔德的NASA艾姆斯研究中心（NASA Ames Research Center）完成。我们衷心感谢G. Conrad、J. Erlichman、R. Geitgy、F. Busche及J. Rasho诸位在电子探针分析工作中提供的协助，同时感谢J. Etheridge女士、R. Taylor夫妇及M. Busch小姐在数据处理环节给予的支持。本研究部分由NASA合同NAS9-9365资助（Klaus Keil为项目首席研究员）。