Basaltic diversity at the Apollo 12 landing site: Inferences from petrologic examinations of the soil sample 12003
Basaltic diversity at the Apollo 12 landing site: Inferences from petrologic examinations of the soil sample 12003
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阿波罗 12 号着陆点的玄武岩多样性：对土壤样本 12003 进行岩石学检查的推论
DOI：
10.1111/maps.12285
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发表时间：
2014
影响因子：
2.2
通讯作者：
Snape J
中科院分区：
文献类型：
--
作者：
Snape J
作为正在进行的阿波罗12号着陆点玄武岩多样性研究的一部分，对12003土壤样品中的17块玄武岩碎片（尺寸在1到10毫米之间）进行了详细的岩石学调查。人们试图根据公认的橄榄石、钙钛矿、钛铁矿和蓝宝石玄武岩的分组对这些样品进行分类。特别注意主要、次要和微量元素矿物化学的变化（通过电子探针分析和激光烧蚀ICP-MS测定），这可能表明特定的玄武岩套件，并且比批量样品特征更不易受采样偏差的影响。在12003土壤中已鉴定出所有三种主要玄武岩（橄榄石、钙钛矿和钛铁矿）。其中一个样本被确定为可能新增加的一个新的样本，该样本目前只包括一个其他已确认的样本。额外的玄武岩的鉴定加强了这样一种论点，即它们代表了阿波罗12号现场当地采样不佳的玄武岩流，而不是通过撞击混合过程引入现场的外来物质。三个样品被确定为代表一个或两个以前未被识别的玄武岩套房的成员。
A detailed petrologic survey has been made of 17 basaltic chips (sized between 1 and 10 mm) from the 12003 soil sample as part of an ongoing study of basaltic diversity at the Apollo 12 landing site. An attempt has been made to classify these samples according to the well‐established grouping of olivine, pigeonite, ilmenite, and feldspathic basalts. Particular attention has been paid to variations in major, minor, and trace element mineral chemistry (determined by electron microprobe analysis and laser ablation ICP‐MS), which may be indicative of particular basaltic suites and less susceptible to sampling bias than bulk sample characteristics. Examples of all three main (olivine, pigeonite, and ilmenite) basaltic suites have been identified within the 12003 soil. One sample is identified as a possible new addition to the feldspathic suite, which currently consists of only one other confirmed sample. Identification of additional feldspathic basalts strengthens the argument that they represent a poorly sampled basaltic flow local to the Apollo 12 site, rather than exotic material introduced to the site by impact mixing processes. Three samples are identified as representing members of one or two previously unrecognized basaltic suites.
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