Results 151 to 160 of about 10,659 (186)
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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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Petrology and geochemistry of lunar dimict breccia 61015
Journal of Geophysical Research: Solid Earth, 1984Dimict breccia 61015 consists dominantly of granulated anorthosite and impact melt rock of VHA (very‐high‐alumina)‐basalt composition. The anorthosite is a typical Apollo 16 ferroan anorthosite, except that it is slightly more augite‐rich than most other ferroan anorthosites. The breccia probably formed in the floor of an expanding crater cavity by the
Odette B. James +2 more
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MINERALOGY, PETROLOGY AND CHEMISTRY OF LUNAR ROCK 12039
Meteoritics, 1972Rock 12039 belongs to the olivine‐depleted group of magmatic rocks characterized by normative and modal SiO2, absence or very low abundance of olivine, and high FeO/(FeO + MgO), Ti/Cr, and CaO/MgO ratios. Clinopyroxenes in this rock show a complex, essentially continuous, compositional zonation from augite cores through ferroaugite to ferrohedenbergite
T. E. Bunch, Klaus Keils, Martin Prinz
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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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Petrology of Lunar Rocks and Implication to Lunar Evolution
Annual Review of Earth and Planetary Sciences, 1976Recent advances in lunar petrology, based on studies of lunar rock samples available through the Apollo program, are reviewed. Samples of bedrock from both maria and terra have been collected where micrometeorite impact penetrated the regolith and brought bedrock to the surface, but no in situ cores have been taken. Lunar petrogenesis and lunar thermal
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Lunar Regolith: Petrology of the <10 μm fraction
Journal of Geophysical Research: Solid Earth, 1982It has been known for some time that the part of the lunar regolith smaller than 10 micrometers (<10 μm) is chemically distinct from the bulk soil. Specifically, it is enriched in Al, Ca, Na, K, light rare earth elements, and Th, and depleted in Mg, Fe, Mn, and Sc. Three models have been proposed to explain those systematics.
James M. Devine +2 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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American Mineralogist, 2013
Apollo 12 sample 12032,366-19 is a 21.3 mg granite fragment that is distinct from any other lunar granite or felsite. It is composed of barian K-feldspar, quartz, sodic plagioclase, hedenbergite, fayalite, and ilmenite, with trace amounts of zirconolite, baddeleyite, apatite, and merrillite.
S. M. Seddio +3 more
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Apollo 12 sample 12032,366-19 is a 21.3 mg granite fragment that is distinct from any other lunar granite or felsite. It is composed of barian K-feldspar, quartz, sodic plagioclase, hedenbergite, fayalite, and ilmenite, with trace amounts of zirconolite, baddeleyite, apatite, and merrillite.
S. M. Seddio +3 more
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Petrology of Luna 20 regolith from the lunar highlands
Geochimica et Cosmochimica Acta, 1973The Luna 20 regolith sample contains crystalline lithic fragments of mare basalt, the anorthosite-norite-troctolite group, and feldspathic basalt. Discrete mineral fragments and mineral fragments in regolith breccias can generally be assigned, based on chemical criteria, to one or the other of the first two rock types.
Maria Luisa Crawford, Peter W. Weigand
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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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