The petrology, geochemistry, and age of lunar regolith breccias Miller Range 090036 and 090070: Insights into the crustal history of the Moon

The petrology, geochemistry, and age of lunar regolith breccias Miller Range 090036 and 090070: Insights into the crustal history of the Moon
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米勒范围 090036 和 090070 月球风化角砾岩的岩石学、地球化学和年龄:深入了解月球地壳历史

DOI:
10.1111/maps.12737
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发表时间:
2016
影响因子:
2.2
通讯作者:
Calzada-Diaz A
Calzada-Diaz A
中科院分区:
地球科学3区
文献类型:
--
作者:
Calzada-Diaz A

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除了阿波罗号和月球号的样本外,撞击事件造成的陨石从月球表面喷射出来也是月球物质的重要来源。在这里,我们报告散装元素组成,矿物化学,年龄和岩相学的米勒范围(MIL)090036和090070月球陨石。MIL 090036和090070都是由玻璃基质中的矿物碎片和岩屑碎屑组成的斜长风化角砾岩。它们不是成对的,代表了月球地壳两个不同区域的采样,这些区域的原岩类似于含铁斜长岩。对MIL 090070,33的两个子分裂(一个苍白的碎屑撞击熔体和一个黑暗的玻璃质熔体成分)进行的40 Ar-39 Ar年代学表明,样品经历了两次主要的脱气事件,一次在~3.88 Ga,另一次在~3.65 Ga。从MIL 090070获得的宇宙射线暴露数据与接近月球表面的短期(~8-9 Ma)暴露一致。将两个样本中的大块岩石FeO、TiO 2和Th浓度与2度月球勘探者伽马射线光谱仪(LP-GRS)数据集进行比较,以确定月壤与样本上观察到的丰度相匹配的月球表面区域。我们发现,MIL 090036散装岩石是成分最相似的风化层周围的Procellarum KREEP地体,而MIL 090070最好的匹配风化层在月球背面的Auspathic高地。我们的研究结果表明,月球背面地壳的某些地区是由铁斜长岩,和样品揭示了古代月球高地的演化和撞击历史。
Meteorites ejected from the surface of the Moon as a result of impact events are an important source of lunar material in addition to Apollo and Luna samples. Here, we report bulk element composition, mineral chemistry, age, and petrography of Miller Range (MIL) 090036 and 090070 lunar meteorites. MIL 090036 and 090070 are both anorthositic regolith breccias consisting of mineral fragments and lithic clasts in a glassy matrix. They are not paired and represent sampling of two distinct regions of the lunar crust that have protoliths similar to ferroan anorthosites.40Ar‐39Ar chronology performed on two subsplits of MIL 090070,33 (a pale clast impact melt and a dark glassy melt component) shows that the sample underwent two main degassing events, one at ~3.88 Ga and another at ~3.65 Ga. The cosmic ray exposure data obtained from MIL 090070 are consistent with a short (~8–9 Ma) exposure close to the lunar surface. Bulk‐rock FeO, TiO2, and Th concentrations in both samples were compared with 2‐degree Lunar Prospector Gamma Ray Spectrometer (LP‐GRS) data sets to determine areas of the lunar surface where the regolith matches the abundances observed on the sample. We find that MIL 090036 bulk rock is compositionally most similar to regolith surrounding the Procellarum KREEP Terrane, whereas MIL 090070 best matches regolith in the feldspathic highlands terrane on the lunar farside. Our results suggest that some areas of the lunar farside crust are composed of ferroan anorthosite, and that the samples shed light on the evolution and impact bombardment history of the ancient lunar highlands.
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发表时间: 2016
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作者:
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发表时间: 2006-12
影响因子: 5
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FFBS Lett.184-1。
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