Results 141 to 150 of about 10,659 (186)
Some of the next articles are maybe not open access.
Reviews of Geophysics, 1975
The moon is covered with a thin layer of unconsolidated debris called the lunar regolith. A typical sample of this regolith could be characterized as a gray, poorly sorted pebble‐ or cobble‐bearing silty sand having a bulk density of about 1.5 g/cm³. It consists of lithic and mineral fragments mostly from the local underlying bedrock and glass formed ...
openaire +3 more sources
The moon is covered with a thin layer of unconsolidated debris called the lunar regolith. A typical sample of this regolith could be characterized as a gray, poorly sorted pebble‐ or cobble‐bearing silty sand having a bulk density of about 1.5 g/cm³. It consists of lithic and mineral fragments mostly from the local underlying bedrock and glass formed ...
openaire +3 more sources
The lunar magma ocean: Reconciling the solidification process with lunar petrology and geochronology
Earth and Planetary Science Letters, 2011Abstract The Moon is thought to have originated with a magma ocean that produced a plagioclase flotation crust as solidification proceeded. Ages of anorthositic crust range over at least 200 million years. The model for solidification presented here integrates chemical and physical constraints of lunar magma ocean solidification to determine (1) the ...
Linda T. Elkins-Tanton +2 more
openaire +3 more sources
Mineralogy, petrology, and geochemistry of the lunar samples
Reviews of Geophysics, 1975The years 1971–1974 mark the maturing of lunar mineralogy, petrology, and geochemistry into a full‐fledged science. During these years the prime objective of lunar sample investigation teams changed from general surveys of the nature of returned lunar material into problem‐oriented studies. Four general areas of interest that evolved during these years
openaire +3 more sources
Mineralogy and petrology of the LaPaz Icefield lunar mare basaltic meteorites [PDF]
Meteoritics & Planetary Science, 2005 Five basaltic meteorites from the LaPaz ice field are paired on the basis of their mineralogy and texture, and represent a unique basalt type distinct from those in the Apollo or Luna sample collections. LaPaz Icefield (LAP) 02205, LAP 02224, LAP 02226, LAP 02436 and LAP 03632 all contain plagioclase, pyroxene, ilmenite, spinel, olivine, and minor ...
K. Righter, S. J. Collins, A. D. Brandon
openaire +2 more sources
Petrology of the lunar soil and geophysical implications
Journal of Geophysical Research, 1970The Apollo 11 soil sample consists of particles derived from two rock suites, basaltic and anorthositic. Crystalline, glassy, and brecciated forms of each rock type are present. The basaltic suite (95% of identifiable soil particles) must be representative of mare rock; the anorthosites appear to derive from the lunar highlands.
openaire +3 more sources
Petrology, mineralogy, and genesis of lunar crystalline igneous rocks
Journal of Geophysical Research, 1970Information on the mineralogy and petrology of the Apollo 11 crystalline basaltic rocks, obtained by about 35 groups of investigators, is summarized and used as a basis for speculation. The textural assemblage indicates near-surface, rapid crystallization from low-viscosity basaltic magmas under low oxygen pressures.
openaire +3 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +1 more source
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
openaire +2 more sources