The samarium-neodymium chronology of chondrites.
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چکیده
منابع مشابه
Samarium-neodymium systematics in kimberlites and in the minerals of garnet lherzolite inclusions.
The initial ratios of neodymium-143 to neodymium-144 in kimberlites ranging in age between 90 x 10(6) to 1300 x 10(6) years from South Africa, India, and the United States are different from the corresponding ratios in the minerals of peridotite inclusions in the kimberlites but are identical to the ratios in the basaltic achondrite Juvinas at the times of emplacement of the respective kimberli...
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Ar-Ar dating of 13 samples from 5 shock-melted ordinary chondrites is used to determine the timing of impacts in the Main Asteroid Belt. Three samples of the H impact melt LAP 02240 have welldefined plateaus at ~3900 Ma, consistent with the “lunar cataclysm” and many other meteorite impact ages. The LL impact melt breccia NWA 1701 records an impact at ~1000 Ma, in which melt was more thoroughly...
متن کاملChondrite barium, neodymium, and samarium isotopic heterogeneity and early Earth differentiation.
Isotopic variability in barium, neodymium, and samarium in carbonaceous chondrites reflects the distinct stellar nucleosynthetic contributions to the early solar system. We used 148Nd/144Nd to correct for the observed s-process deficiency, which produced a chondrite 146Sm-142Nd isochron consistent with previous estimates of the initial solar system abundance of 146Sm and a 142Nd/144Nd at averag...
متن کاملThe neodymium neologism.
In 1838, Swedish chemist Carl Mosander isolated lanthanum, a new metal that had been hiding in Berzelius’ cerium since 18031. Two years later, he found yet another metal in cerium — this third component was responsible for a purplish hue in his samples2. He named this metal didymium, from a Greek word meaning twin. Didymium shared many chemical properties with lanthanum and thus appeared to be ...
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cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: GEOCHEMICAL JOURNAL
سال: 1975
ISSN: 0016-7002
DOI: 10.2343/geochemj.9.97