Ages of Crystalline Rocks from Fra Mauro

Ages of Crystalline Rocks from Fra Mauro

Crystallization ages for six rocks from Fra Mauro have been measured by the argon-40-argon-39 method. All six rocks give an age of 3.77 ± 0.15 × 10$^{9}$ years, which is the same as for fragmental rocks from this site. It is concluded that the Imbrium event and the crystallization of a significant p...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 1971-09, Vol.173 (4003), p.1235-1236
Hauptverfasser: Husain, Liaquat, Sutter, John F., Schaeffer, Oliver A.
Format: Artikel
Sprache:eng
Schlagworte:
Argon
Basalt
Crystallization
Earth
Error rates
Igneous rocks
Lunar rocks
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Zusammenfassung:Crystallization ages for six rocks from Fra Mauro have been measured by the argon-40-argon-39 method. All six rocks give an age of 3.77 ± 0.15 × 10$^{9}$ years, which is the same as for fragmental rocks from this site. It is concluded that the Imbrium event and the crystallization of a significant portion of the pre-Imbrian basalts were essentially contemporaneous.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.173.4003.1235