Potassium-Argon Ages of Lunar Rocks from Mare Tranquillitatis and Oceanus Procellarum

Details Potassium-Argon Ages of Lunar Rocks from Mare Tranquillitatis and Oceanus Procellarum Potassium-Argon Ages of Lunar Rocks from Mare Tranquillitatis and Oceanus Procellarum

Oct 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...170..161s&link_type=abstract

Science, Volume 170, Issue 3954, pp. 161-162

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Scientific paper

Crystalline rocks from Mare Tranquillitatis have yielded potassium-argon dates as old as 3.8 × 109 years. Crystalline rocks from Oceanus Procellarum give potassium-argon ages as old as 2.8 × 109 years. Evidently the maria are ancient features of the moon and were not formed contemporaneously, a conclusion that also has been verified by other methods. The potassium-argon ages of rocks from Oceanus Procellarum show much more loss of argon than the rocks from Mare Tranquillitatis, an indication that the rocks at Oceanus Procellarum have experienced more severe shock effects or longer cooling rates.

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