Modal petrology of six soils from Apollo 16 Double Drive Tube Core 64002
Modal petrology of six soils from Apollo 16 Double Drive Tube Core 64002
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阿波罗 16 号双驱动管芯 64002 六种土壤的模态岩石学
DOI：
10.1029/jb087is01p0a210
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发表时间：
1982
影响因子：
--
通讯作者：
K. Houck
中科院分区：
文献类型：
--
作者：
K. Houck
详细的岩相学数据是从阿波罗16号驱动管段64002的六个样品的六个粒度级中收集的。岩芯中的土壤与阿波罗16号表层土壤和岩芯60009具有相似的源岩（定义为斜长岩、撞击熔融物和变质角砾岩）。两组略有不同的源岩，一组变质角砾岩与结晶基质角砾岩的比例为0.02：3，另一组为0.01：1，分别定义为岩心的上部和下部。模态数据的分析表明，上三个和最低的核心土壤是成熟的，有类似的成熟历史，而两个中间的土壤是亚成熟的，有成熟历史彼此相似，但不同的上部和最低的土壤。在岩心64002土壤中，混合作用占主导地位。混合组分被认为是由不同的源岩区分的两种成熟土壤和未成熟的富含斜长石的土壤。富含斜长石的土壤在岩芯的未成熟部分最为突出，似乎与较大的白垩质易碎角砾岩碎屑相关。脆性角砾岩和未成熟的斜长石丰富的土壤初步与笛卡尔组。补充岩相数据与53锰，铁磁共振（FMR），和核心解剖数据允许划分为三个区域的核心。上成熟带是相当均匀的，是最近在短时间内沉积的。中亚成熟带较不均一，斜长石较丰富，可能为喷出物存款。下带虽然成熟、均一，但与中带具有相同的烃源岩。
Detailed petrographic data were collected from six size fractions for six samples from Apollo 16 drive tube section 64002. Soils from the core were found to have similar source rocks (defined as anorthosites, impact melts, and metamorphosed breccia) to Apollo 16 surface soils and core 60009. Two slightly differing sets of source rocks, one with a metamorphosed breccia to crystalline matrix breccia ratio of ∼2:3 and the other with a ratio of ∼ 1:1, were defined for the upper and lower sections of the core, respectively. Analysis of modal data shows that the upper three and the lowermost core soils are mature and have similar maturation histories, whereas the two middle soils are submature and have maturation histories similar to each other but differing from the upper and lowermost soils. In core 64002 soils, mixing has dominated over reworking. Mixing components are thought to be two mature soils distinguished by differing source rocks, and an immature plagioclase-rich soil. The plagioclase-rich soil is most prominent in the submature section of the core, and appears to correlate with larger clasts of chalky, friable breccia. The friable breccias and the immature plagioclase-rich soil are tentatively associated with the Descartes Formation. Supplementation of petrographic data with 53Mn, ferromagnetic resonance (FMR), and core dissection data allows division of the core into three zones. The upper mature zone is fairly homogenous and was recently deposited in a short span of time. The middle submature zone is less homogenous, more plagioclase rich, and may be an ejecta deposit. The lower zone, though mature and homogenous, has the same source rocks as the middle zone.