Sm-Nd systematics of chondrites
We have studied the147Sm-143Nd and146Sm-142Nd isotopic systems in phosphate fractions and chondrules from six ordinary chondrites and one carbonaceous chondrite, previously dated with Pb-Pb method.147Sm/144Nd ratios vary between 0.182 and 0.191 in phosphates, and between 0.179 and 0.243 in chondrules. The147Sm-143Nd isochron regression through all 34 phosphate and chondrule analyses yields a date of 4588±100 Ma and is in good agreement with more precise Pb-Pb dates of the same chondrites. The...[Show more]
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|Source:||Earth and Planetary Science Letters|
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