Results 141 to 150 of about 1,510 (199)
Some of the next articles are maybe not open access.
Meteoritics, 1990
Abstract— The Trebbin chondrite (fall, 1988) is a shocked, cataclastic breccia of LL6 parentage.
G. Andrehs, K. Adam
openaire +1 more source
Abstract— The Trebbin chondrite (fall, 1988) is a shocked, cataclastic breccia of LL6 parentage.
G. Andrehs, K. Adam
openaire +1 more source
The compositional classification of chondrites: VII. The R chondrite group
Geochimica et Cosmochimica Acta, 1996Bulk compositional and petrographic data clearly define the new R (Rumuruti) group of chondrites consisting of Rumuruti (the only fall), ALH85151, Acfer 217, Carlisle Lakes, Dar al Gani 013, PCA91002, PCA91241, Y-75302, Y-793575, and Y-82002. Compositional, petrographic, rare-gas, and 0-isotopic data strongly suggest that PCA91002 and PCA91241 are ...
Gregory W. Kallemeyn +2 more
openaire +1 more source
Geochimica et Cosmochimica Acta, 2000
Ion-microprobe studies yield Δ17O (=δ17O − 0.52 · δ18O) values in magnetite from the Rumurti chondrite (RC) PCA91241 (which is paired with PCA91002) of +3.1 to +3.9‰, slightly higher than that in O from whole-rock R samples. Despite Δ17O values in whole-rock RCs that are much (by ca.
James P Greenwood +2 more
openaire +1 more source
Ion-microprobe studies yield Δ17O (=δ17O − 0.52 · δ18O) values in magnetite from the Rumurti chondrite (RC) PCA91241 (which is paired with PCA91002) of +3.1 to +3.9‰, slightly higher than that in O from whole-rock R samples. Despite Δ17O values in whole-rock RCs that are much (by ca.
James P Greenwood +2 more
openaire +1 more source
Chainpur-like Chondrites: Primitive Precursors of Ordinary Chondrites?
Science, 1966Chainpur and similar, apparently primitive, chondritic meteorites may be precursors of ordinary chondrites; a variety of evidence supports this working hypothesis. In general, carbonaceous chondrites seem to be related collaterally to this genetic sequence rather than being direct ancestors of ordinary chondrites.
R A, Schmitt, R H, Smith, G G, Goles
openaire +2 more sources
Meteoritics, 1981
According to its petrography, uniform olivine, Fa23.8, and pyroxene, Fs20.4, a total iron content of 22.9 wt % Fe, 16.4 wt % FeO and an FeO/FeO + MgO ratio of 24.7 mol %, the Tambakwatu is a veined, intermediate hypersthene (Cia) or L6 chondrite.
K. Fredriksson +3 more
openaire +1 more source
According to its petrography, uniform olivine, Fa23.8, and pyroxene, Fs20.4, a total iron content of 22.9 wt % Fe, 16.4 wt % FeO and an FeO/FeO + MgO ratio of 24.7 mol %, the Tambakwatu is a veined, intermediate hypersthene (Cia) or L6 chondrite.
K. Fredriksson +3 more
openaire +1 more source
Journal of Geophysical Research, 1967
The Hg abundance has been determined in chondritic meteorites by neutron activation and separation by volatilization over a series of temperatures ranging from 110° to 1200°C. Hg is highly fractionated between classes of chondrites and within the classes themselves.
G. W. Reed, S. Jovanovic
openaire +1 more source
The Hg abundance has been determined in chondritic meteorites by neutron activation and separation by volatilization over a series of temperatures ranging from 110° to 1200°C. Hg is highly fractionated between classes of chondrites and within the classes themselves.
G. W. Reed, S. Jovanovic
openaire +1 more source
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