Results 111 to 120 of about 274 (137)

MINERALOGY, PETROLOGY AND CHEMISTRY OF LUNAR ROCK 12039

Meteoritics, 1972
Rock 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
openaire   +1 more source

Petrology and geochemistry of lunar dimict breccia 61015

Journal of Geophysical Research: Solid Earth, 1984
Dimict 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, Marta K. Flohr, Marilyn M. Lindstrom   +2 more
openaire   +1 more source

Experimental Petrology of Lunar Highland Basalt Composition and Applications to Models for the Lunar Interior

The Journal of Geology, 1974
Lunar Highland Basalt (gabbroic anorthosite) composition transforms with increasing pressure through assemblages of spinel + clinopyroxene + anorthite, and garnet + clinopyroxene + anorthite ± quartz to eclogitic assemblages of garnet + clinopyroxene + kyanite + quartz (p = 3.51 - 3.52).
A. Råheim, D. H. Green
openaire   +1 more source

Petrology and geochemistry of lunar granite 12032,366-19 and implications for lunar granite petrogenesis

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, B. L. Jolliff, R. L. Korotev, R. A. Zeigler   +3 more
openaire   +1 more source

Petrology of Luna 20 regolith from the lunar highlands

Geochimica et Cosmochimica Acta, 1973
The 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
openaire   +1 more source

Mineralogy and petrology of sample 67075 and the origin of lunar anorthosites

Earth and Planetary Science Letters, 1975
Abstract Plagioclase in cataclastic anorthosite 67075 occurs as angular matrix grains and as recrystallized clasts of micro-anorthosite. Olivines are Fe-rich and fall into two compositional groupings. Large grains of pyroxene show exceptionally well-developed exsolution lamellae analogous to those observed in pyroxenes from layered complexes. The low-
I.S. McCallum, F.P. Okamura, S. Ghose
openaire   +1 more source

Lunar Regolith: Petrology of the <10 μm fraction

Journal of Geophysical Research: Solid Earth, 1982
It 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, David S. McKay, James J. Papike   +2 more
openaire   +1 more source

The Mineralogy, petrology and geochemistry of lunar samples - a review

The Moon, 1972
Crystallization from the molten state has been an important process for the formation of rocks on the Moon; the phenomenon of fractional crystallization is therefore discussed. The principal chemical and mineralogical features of the Apollo 11, 12 and 14 basaltic crystalline rocks are described, and an account is given of other rock types and minerals ...
openaire   +1 more source

Petrology of Unshocked Crystalline Rocks and Shock Effects in Lunar Rocks and Minerals

Science, 1970
On the basis of rock modes, textures, and mineralogy, unshocked crystalline rocks are classified into a dominant ilmenite-rich suite (subdivided into intersertal, ophitic, and hornfels types) and a subordinate feldspar-rich suite (subdivided into poikilitic and granular types).
E C, Chao, O B, James, J A, Minkin, J A, Boreman, E D, Jackson, C B, Raleigh   +5 more
openaire   +2 more sources

Petrology and geochemistry of alkali gabbronorites from Lunar Breccia 67975

Journal of Geophysical Research: Solid Earth, 1987
Clasts of an unusual type of lunar highlands igneous rock, alkali gabbronorite, have been found in Apollo 16 breccia 67975. The alkali gabbronorites form two distinct subgroups, magnesian and ferroan. Modes and bulk compositions are highly varied. The magnesian alkali gabbronorites are composed of bytownitic plagioclase (Or2–5An82–89), hypersthene (Wo3–
Odette B. James, Marilyn M. Lindstrom, Marta K. Flohr   +2 more
openaire   +1 more source