Results 221 to 230 of about 32,111 (286)
Some of the next articles are maybe not open access.
Meteoritics, 1972
The Seoni (India) chondrite is an H6 group ordinary chondrite that contains olivine (Fa, 19.7 mole%), orthopyroxene (Fs, 15.9 mole%), clinopyroxene, plagioclase (An, 10.3; Or, 5.6 mole%), together with chromite, troilite, kamacite, taenite, chlorapatite, and whitlockite.
T. E. Bunch, A. P. Mall, C. F. Lewis
openaire +1 more source
The Seoni (India) chondrite is an H6 group ordinary chondrite that contains olivine (Fa, 19.7 mole%), orthopyroxene (Fs, 15.9 mole%), clinopyroxene, plagioclase (An, 10.3; Or, 5.6 mole%), together with chromite, troilite, kamacite, taenite, chlorapatite, and whitlockite.
T. E. Bunch, A. P. Mall, C. F. Lewis
openaire +1 more source
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1988
Abstract A compilation of data on 78 elements in the nine groups of chondrites shows each to be isochemical with the exception of a few volatiles. With the exception of the most volatile elements, the groups have solar abundances to within a factor of two.
J. T. Wasson, G. W. Kallemeyn
openaire +1 more source
Abstract A compilation of data on 78 elements in the nine groups of chondrites shows each to be isochemical with the exception of a few volatiles. With the exception of the most volatile elements, the groups have solar abundances to within a factor of two.
J. T. Wasson, G. W. Kallemeyn
openaire +1 more source
Meteoritics, 1988
Abstract— Based on optical microscopy and electron microprobe analysis, Linum is classified as an L6b chondrite that contains olivine (Fa24), orthopyroxene (Fs20), clinopyroxene (Wo45En47Fs8), plagioclase (An10Ab84Or6), nickel‐iron, troilite, chromite and accessory amounts of chlorapatite and whitlockite.
J. Matthes, K. Adam
openaire +1 more source
Abstract— Based on optical microscopy and electron microprobe analysis, Linum is classified as an L6b chondrite that contains olivine (Fa24), orthopyroxene (Fs20), clinopyroxene (Wo45En47Fs8), plagioclase (An10Ab84Or6), nickel‐iron, troilite, chromite and accessory amounts of chlorapatite and whitlockite.
J. Matthes, K. Adam
openaire +1 more source
Space Science Reviews, 1963
The carbonaceous chondrites are a group of stony meteorites characterized by the presence of an appreciable amount of carbonaceous material other than free carbon (diamond and graphite). They have been divided into three subgroups known respectively as Type I, Type II, and Type III.
openaire +1 more source
The carbonaceous chondrites are a group of stony meteorites characterized by the presence of an appreciable amount of carbonaceous material other than free carbon (diamond and graphite). They have been divided into three subgroups known respectively as Type I, Type II, and Type III.
openaire +1 more source
Amino acids in carbonaceous chondrites
Origins of Life, 1974For almost 20 years laboratory experiments have advanced the concepts of chemical evolution, particularly with regard to formation of the amino acids. What has been generally lacking is concrete natural evidence for this chemical evolution hypothesis.
J G, Lawless, E, Peterson
openaire +2 more sources
Geochimica et Cosmochimica Acta, 1956
Abstract Chondrites have uniform gallium contents; the average of nineteen samples is 5.3 p.p.m. Ga, with the range 4.2–6.8 p.p.m. Composites of these contain an average of 3.2 p.p.m. Ga in the silicate phase, 15 p.p.m. in the metal phase, and 12 p.p.m. in the sulphide phase.
Hiroshi Onishi, E.B Sandell
openaire +1 more source
Abstract Chondrites have uniform gallium contents; the average of nineteen samples is 5.3 p.p.m. Ga, with the range 4.2–6.8 p.p.m. Composites of these contain an average of 3.2 p.p.m. Ga in the silicate phase, 15 p.p.m. in the metal phase, and 12 p.p.m. in the sulphide phase.
Hiroshi Onishi, E.B Sandell
openaire +1 more source
Geochimica et Cosmochimica Acta, 1962
Abstract The concept of chondrites as metamorphic rocks is examined. Mineralogies of four chondrites whose textures indicate different degrees of thermal recrystallization are presented. It appears that relatively unmetamorphosed or “primary” chondritic material consisted of reduced chondrules (metallic iron, magnesian silicates) in an oxidized ...
openaire +1 more source
Abstract The concept of chondrites as metamorphic rocks is examined. Mineralogies of four chondrites whose textures indicate different degrees of thermal recrystallization are presented. It appears that relatively unmetamorphosed or “primary” chondritic material consisted of reduced chondrules (metallic iron, magnesian silicates) in an oxidized ...
openaire +1 more source
Abstract Although enstatite chondrites constitute only 1.5% of well-documented meteorite falls, they are distinctive in being the most highly reduced chondrites. The two main enstatite-chondrite groups—EH (high bulk iron, high siderophiles) and EL (low bulk iron, low siderophiles)—differ in bulk oxidation state and in their abundance ...
openaire +1 more source
openaire +1 more source
The accretion and impact history of the ordinary chondrite parent bodies
, 2017T. Blackburn +3 more
semanticscholar +1 more source
Polycyclic aromatic hydrocarbons in the Mukundpura (CM2) Chondrite
Planetary and Space Science, 2021E V S S K Babu, Devleena Mani
exaly