Ar-39-Ar-40 ages of samples from the Apollo 17 station 7 boulder and implications for its formation

Details Ar-39-Ar-40 ages of samples from the Apollo 17 station 7 boulder and implications for its formation Ar-39-Ar-40 ages of samples from the Apollo 17 station 7 boulder and implications for its formation

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974e%26psl..23..453s&link_type=abstract

Earth and Planetary Science Letters, vol. 23, no. 3, Oct. 1974, p. 453-461. Swiss National Science Foundation

Physics

5

Age Factor, Apollo 17 Flight, Argon Isotopes, Basalt, Lunar Rocks, Cosmic Rays, Lithology, Lunar Landing Sites, Samples, Tables (Data)

Scientific paper

Ar-39-Ar-40 ages and Ar-37-Ar-38 exposure ages of samples representing four different lithologies of the Apollo 17 station 7 boulder were measured. The age of the dark veinlet material 77015 of 3.98 AE is interpreted as representing the time of intrusion of this veinlet into the 77215 clast. The data obtained so far indicate that the vesicular basalt 77135 formed 100-200 m.y. later. However, this has to be confirmed by Ar-39-Ar-40 investigations on separated mineral and/or grain-size fractions. A small clast enclosed in the 77135 basalt gives a well-defined high temperature age of 3.99 AE. A sample of the noritic clast 77215 gave 4.04 AE, the highest age found so far in this boulder. The Ar-39-Ar-40 ages obtained are in agreement with the age relationships deduced from the stratigraphic evidence. Taking into account the shielding by the boulder itself, an average Ar-37-Ar-38 exposure age of (27.5 plus or minus 2.5) m.y. is obtained for the samples collected from the boulder.

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