Searching for nonlocal lithologies in the Apollo 12 regolith: A geochemical and petrological study of basaltic coarse fines from the Apollo lunar soil sample 12023,155
Searching for nonlocal lithologies in the Apollo 12 regolith: A geochemical and petrological study of basaltic coarse fines from the Apollo lunar soil sample 12023,155
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寻找阿波罗 12 号风化层中的非局部岩性：对阿波罗月球土壤样本中玄武岩粗粉的地球化学和岩石学研究 12023,155
DOI：
10.1111/maps.12319
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发表时间：
2014
影响因子：
2.2
通讯作者：
Alexander L
中科院分区：
文献类型：
--
作者：
Alexander L
来自阿波罗12号土壤样本12023,155的12个粗玄武岩细粉的岩石学和地球化学检查的新数据提供了着陆点额外的地球化学多样性的证据。除了大量的化学成分外，还采用了矿物相的主、次和微量元素分析，以确定这些样品与Apollo 12岩性玄武岩群的关系，从而克服了小样品代表性的问题。所有研究的样品都是低钛玄武岩(0.9-5.7wt%二氧化钛)，许多属于阿波罗12玄武岩套中已确立的橄榄石、白云母和钛铁矿分类。有五个例外：样品12023,155_1A在矿物学和成分上与其他Apollo 12玄武岩类型不同，具有低鸽子岩REE含量和低Ni(41-55ppm)和Mn(2400-2556ppm)橄榄石含量。样品12023、155_11A也是独一无二的，其富铁矿物组成和低的体相镁#(=100×10原子镁/[镁+铁])为21.6。与其他Apollo 12玄武岩相比，样品12023、155_7A具有不同的斜长石化学和结晶趋势以及更大范围的橄榄石Mg#(34-55)，并与Apollo 14高铝玄武岩有更大的相似性。另外两个样品(12023,155_4A和_5A)与阿波罗12号长石质玄武岩12038相似，提供了额外的证据，表明长石玄武岩代表了阿波罗12号遗址附近的熔岩流，而不是碰撞引入的物质。我们认为，除了先前发现的橄榄石、白云母和钛铁矿玄武岩套外，至少需要一种母岩浆，可能需要多达四种不同的母岩浆，以解释在本研究中发现的玄武岩的化学多样性。
New data from a petrological and geochemical examination of 12 coarse basaltic fines from the Apollo 12 soil sample 12023,155 provide evidence of additional geochemical diversity at the landing site. In addition to the bulk chemical composition, major, minor, and trace element analyses of mineral phases are employed to ascertain how these samples relate to the Apollo 12 lithological basalt groups, thereby overcoming the problems of representativeness of small samples. All of the samples studied are low‐Ti basalts (0.9–5.7 wt% TiO2), and many fall into the established olivine, pigeonite, and ilmenite classification of Apollo 12 basaltic suites. There are five exceptions: sample 12023,155_1A is mineralogically and compositionally distinct from other Apollo 12 basalt types, with low pigeonite REE concentrations and low Ni (41–55 ppm) and Mn (2400–2556 ppm) concentrations in olivine. Sample 12023,155_11A is also unique, with Fe‐rich mineral compositions and low bulk Mg# (=100 × atomic Mg/[Mg+Fe]) of 21.6. Sample 12023,155_7A has different plagioclase chemistry and crystallization trends as well as a wider range of olivine Mg# (34–55) compared with other Apollo 12 basalts, and shows greater similarities to Apollo 14 high‐Al basalts. Two other samples (12023,155_4A, and _5A) are similar to the Apollo 12 feldspathic basalt 12038, providing additional evidence that feldspathic basalts represent a lava flow proximal to the Apollo 12 site rather than material introduced by impacts. We suggest that at least one parent magma, and possibly as many as four separate parent magmas, are required in addition to the previously identified olivine, pigeonite, and ilmenite basaltic suites to account for the observed chemical diversity of basalts found in this study.
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