Results 101 to 110 of about 274 (137)
Experimental constraints on the solidification of a nominally dry lunar magma ocean [PDF]
Earth and Planetary Science Letters, 2017 The lunar magma ocean (LMO) concept has been used extensively for lunar evolution models for decades, but to date the full cooling and crystallization path of the LMO has not been studied experimentally.
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Mineralogy and Petrology of Some Lunar Samples
Science, 1970Chemical analyses and norms of four samples are presented which confirm original estimates of low silica, unusual abundance of titania, and low oxidation state of the rocks. Accounts are given of mineralogy and petrology of fine- and coarse-grained igneous rocks and microbreccias with emphasis on chemical composition of individual minerals and glasses.
S O, Agrell +5 more
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Mineralogical and Petrological Investigations of Lunar Samples
Science, 1970Fragments of igneous rocks and breccias, and one coarse-grained rock with thin sections, have been studied. Minerals found include pyroxene, plagioclase, olivine, ilmenite, troilite, ulvöspinel, native iron, cristobalite, tridymite, alkali feldspar, apatite, and quartz. Textures are described and interpreted.
J C, Bailey +7 more
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Experimental Petrology of Lunar Material: the Nature of Mascons, Seas, and the Lunar Interior
Science, 1970One-atmosphere melting data show that Apollo 11 samples are near cotectic. Melting relations at pressures up to 35 kilobars show that clinopyroxenite or amphibole peridotite are possible lunar interiors. Mascons cannot be eclogite; they may be ilmenite accumulate. Hot lunar surface material will boil off alkalis.
M J, O'hara +2 more
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Lunar composition: A geophysical and petrological synthesis
Journal of Geophysical Research: Solid Earth, 1988Lunar compositional constraints are derived on the basis of geophysical data (in particular, the lunar seismic model as revised by Nakamura) and petrological arguments. Only in the case of extreme assumptions can critical aspects of bulk lunar composition be demonstrated to be equivalent to the present‐day terrestrial mantle; specifically, the Moon has
Steve Mueller +2 more
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Mineralogic and Petrologic Study of Lunar Anorthosite Slide 15415,18
Science, 1972The anorthosite slide 15415,18 contains > 98 percent subhedral plagioclase (97 mole percent anorthite), two pyroxenes: diopsidic augite (46 percent wollastonite, 39 percent enstatite, 16 percent ferrosilite) with subsidiary (100) lamellae and grains of hypersthene (2.5 percent wollastonite, 58 percent enstatite, 39.5 percent ferrosilite), and traces
R B, Hargraves, L S, Hollister
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A chemical and petrological model of the lunar crust and implications for lunar crustal origin
Journal of Geophysical Research: Solid Earth, 1986We utilize a variety of lunar sample and orbital geochemical data in conjunction with current knowledge of impact‐cratering processes to develop a chemical and petrological model of the lunar crust. Orbital chemical data indicate that the upper highlands surface on the moon has the bulk composition of “anorthositic gabbro” (Al2O3 26–28 wt %); greater ...
Paul D. Spudis, Philip A. Davis
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The Petrology of Lunar Breccia 15445 and Petrogenetic Implications
The Journal of Geology, 1973Lunar breccia 15445, collected near the rim of Spur Crater, contains iron-rich olivine and ortho-pyroxene mineral clasts and two types of white lithic clasts. The dominant type (Type A) is composed principally of anorthite - magnesian orthopyroxene and appears to be a low-pressure cumulate from a magnesian, high-Al basalt.
W. I. Ridley +4 more
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Lunar materials: Their mineralogy, petrology and chemistry
Earth-Science Reviews, 1972Abstract The manned Apollo 11, 12, 14 and 15 and the automated Luna 16 lunar missions have provided us with lunar rock and regolith (soil) samples from a number of geologically distinct sites. The mare regions were sampled by Apollo 11, 12 and Luna 16, whereas Apollo 14 landed on a terrain with more relief, the Fra Mauro Formation which represents an
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