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• W8555722 startingPage "673" @default.
• W8555722 abstract "Introduction. Liquid immiscibility has been proposed as a process that might have produced lunar granite and separated felsic and mafic components of lunar residual melts (K-frac and REEP-frac, [1,2]). One or the other of these components has been inferred to be the agent of metasomatism [1,2] or autometasomatism [3], or to have been an important assimilant at depth in the Moon’s crust. Textures reflecting liquid immiscibility have been observed in the late stage, iron-rich mesostasis of mare basalts [4], and immiscibility has been produced experimentally in Fe-rich KREEPlike compositions [5]; however, only one lunar sample yet studied shows incontrovertible petrographic evidence for liquid immiscibility in a plutonic assemblage. Sample 14161,7373, a whitlockite-rich “quartz monzogabbro,” was originally described by [6] and, in an ion-microprobe study of its phosphates, Jolliff et al. [3] gave a model for its latestage crystallization history. Important unanswered questions are how concentrated in incompatible elements lunar residual melts were at the time of immiscible liquid separation, and how effective such separated melts might have been as metasomatizing agents in the lunar crust. In this abstract, we present the results of ion-microprobe analyses of pyroxenes and feldspars in 14161,7373. For a sample whose bulk assemblage has REE concentrations at ~5-6 × KREEP levels, the silicates have surprisingly low REE concentrations. The high bulk REE concentrations are the result of a high proportion of whitlockite, probably an excess (i.e., a whitlockite cumulate). We conclude that the REE distribution between minerals resulted from relatively low-T (900°C) equilibration of the final assemblage. Sample Description. Sample 14161,7373 was discovered during an INAA survey of rocklets in Apollo 14 soils [7]. It is a relatively coarse-grained fragment of a larger rock, and although strongly shocked and fractured, it retains relict igneous texture (Fig. 1a). Grain sizes are coarse: pigeonite up to 600 μm, plagioclase, 500 μm, whitlockite, 500 μm, K-feldspar, 100 μm, silica, 200 μm, and grano phyric intergrowths of K-feldspar and silica, 250 μm. Major element compositions of the coarse pyroxenes are quite uniform (En37Fs56Wo7, En30Fs31Wo39), indicating that, for major elements, they are well equilibrated [5]. Plagioclases retain some compositional variation, ranging from coarse calcic grains (An82Ab17Or1) to fine, interstitial, more sodic grains (An57Ab40Or3). Barian K-feldspar compositions average Or83Ab12Cn3.5An1.7. Pyroxenes are mostly uninverted pigeonite with medium augite exsolution lamellae (typically ~10 μm) on 001. Separate augite grains are also present. Silica is present in several forms, identified by laser Raman spectroscopy: amorphous, with very fine-grained patches of quartz, and some “relict” cristobalite. In an unusual texture, several separate grains of silica contain abundant troilite blebs, and thin troilite stringers fill an early set of fractures. Textures that reflect unambiguous liquid immiscibility are perfectly preserved; one of these is an egg-shaped granophyre ~250 μm across (Fig. 1-right). Another occurs in the shape of an elongate tear drop. Ion-Microprobe Results. We measured the REE concentrations and other elements with the modified Cameca 3-f ion microprobe at Washington University. We analyzed coarse-grained exsolved pigeonite within both the low-Ca regions as well as a high-Ca lamella. We also analyzed a separate, exsolved augite grain as well as a small grain that is not exsolved. We analyzed coarse, relatively calcic plagioclase grains (An80) and a smaller, more albitic interstitial grain (An60), and we analyzed K-feldspar within a granophyric intergrowth (Fig. 1-right) and in a separate grain. The results are plotted relative to chondrites in Fig. 2a. Augite has, among the silicates, the highest REE abundances, and" @default.
• W8555722 created "2016-06-24" @default.
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• W8555722 date "1997-03-01" @default.
• W8555722 modified "2023-09-26" @default.
• W8555722 title "Liquid Immiscibility in a Lunar Plutonic Setting and the Evolution of KREEPy Residual Melts" @default.
• W8555722 hasPublicationYear "1997" @default.
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