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B 2143 Figure 21

Figure 21. Internal isochrons of monazite from two samples (7B31-2 and 7B31-9) of Bayan Obo ores that have essentially the same internal isochron mineral ages and 208Pb/204Pb initial ratios. The monazites in these samples probably were deposited from the same hydrothermal solutions.

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Last updated 01.22.98