The Significance of Paleoproterozoic Zircon in Carbonatite Dikes Associated With The Bayan Obo REE-Nb-Fe Deposit
Sensitive high resolution secondary ion mass spectrometry (SHRIMP II), laser ablation inductively coupled plasma mass spectrometry (ICP-MS) and laser Raman spectroscopy have been used to determine the ages in zircons from carbonatite dikes associated with the Bayan Obo giant REE-Nb-Fe deposit, Inner Mongolia, China. Analyses of small amounts of zircon extracted from large samples of three carbonatite dikes yield late Palaeoproterozoic 207Pb/206Pb ages of 1894 ± 27, 1944 ± 20 and 1956 ± 9 Ma....[Show more]
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|Source:||American Journal of Science|
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