 | | Journal (article/letter/editorial) | | include plagioclase (composition around Ann,), troilite, Most of them are poorly chondrichromite and a...investigation of Manbhoom, and pointed out that this meteorite did contain chondrules, although they are sparse...brecciated; however, it is clear that the type meteorite for the rodites is Roda, which is quite different...6 7 8 Y 10 11 12 Jelica; LIXANITSCH, 1892. Appley Bridge; WIIR, unpublished; H,O+, 0.17; H,O-, 0.00;...Savtschenskoje, Sevilla, Sharps, Siena, Umbala. Fa,, : Appley Bridge, Arcadia, Borgo San Donino, Caratash, Chicora |  | | Journal (article/letter/editorial) | | received February 28, 1980 Measured Pb-Pb whole meteorite data for the Bruderheim L6 chondrite scatter slightly...single-stage (closed system) evolution when Ca~on Diablo troilite is used for the initial lead composition. Evidence...as 4.536 Ga by both U-Pb and Pb-Pb data, the meteorite U-Pb system was disturbed by a later (shock?)...the application of a single-stage model to a meteorite that has evidently experienced at least a two-stage...observation that in the concordia diagram most meteorite samples (corrected for Ca~on Diablo lead) plot |  | | Journal (article/letter/editorial) | | lead and thallium in the matrix of the Allende meteorite and the extent of terrestrial lead contamination...University of Oxford, Parks Road, Oxford OX1 3PR (England) Received September 17, 1982 Revised version received...composition of two matrix fractions and whole meteorite were measured and found to be indistinguishable...higher composition than the Pb in the Cation Diablo troilite phase and further indicates that the phenomenon...5 U - 2 ° 7 p b , 232Th-2°8pb and 2°7pb-2°6pb meteorite ages, and the related scatter on the U-Pb and |  | | Journal (article/letter/editorial) | | 1981 U, Th, and Pb analyses of whole-rock and troilite separates from seven L chondrites suggest that...analyses. Using the Pb isotopic composition of troilite separates to calculate the isotopic composition...Two approaches have been used: (1) the chondrite-troilite apparent initial Pb isotopic compositions were...isotopic c o m p o s i t i o n of Cation D i a b l o troilite [2] as primordial, the data plot above the c o...differences in the times of f o r m a t i o n of the meteorite p a r e n t bodies or to either partial or complete |  | | Journal (article/letter/editorial) | | in-situ decay of U. Different samples of the same meteorite show different Pb/Pb model ages. In cases when...and the P b / P b model age if we consider all meteorite types. However, if we consider only the H chondrites...in troilites from ordinary chondrites [7]. The troilite is depleted in U but it shows Pb with a radiogenic...contamination prior to analysis [7]. When the troilite Pb composition is used instead of primordial Pb...for the refractory inclusions of the Allende meteorite (t = 4.566 _+ c. G6pel et al. / Earth and Planetary |  | | Journal (article/letter/editorial) | | article: refractory inclusions of the Allende meteorite, phosphates in ordinary chondrites and basaltic...The proximity of this estimate to the 4.55 Ga meteorite isochron (Patterson, 1956), represented as the...et al., 1969; Minster and Allegre, 1979a,b) or meteorite groups (Gopalan and Wetherill, 1968, 1969; Minster...meteorites and more recent studies. The original Pb-Pb meteorite isochron (Patterson, 1956) is constructed with...composition model age of and Pb-Pb hiahlv radiocenic meteorite samnles v, Y sample type Lllende rg;tory |
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