Xenon compositions of magmatic zircons in 3.64 and 3.81 Ga meta-granitoids from Greenland - a search for extinct 244 Pu in ancient terrestrial rocks
In order to solve the fundamental problem as to whether the extinct radioactive isotope 244Pu was present in the early Earth, we have analysed xenon in magmatic zircons from three early Archaean meta-granitoids from Greenland. Two samples, a granite (sample G97/111) and a ferrogabbro/ferrodiorite (sample G97/112), are from the same ca 3.64 Ga composite intrusion at the mouth of Ameralik fjord. The third sample (sample G97/018) is a ca 3.81 Ga tonalite from a locality south of the Isua...[Show more]
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|Source:||Earth and Planetary Science Letters|
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