How old is the gabbro

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Question: An intrusive Gabbro dike is analyzed with a mass spectrometer for 235U and 207Pb. The half life of decay of 235U to 207Pb is 713 million years. We find that 7/8 of the total is 207Pb, and only 1/8 of the original 235U is still in the rock. How old is the gabbro?

Reference no: EM133715767

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