Mathematics – Logic
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..38..373g&link_type=abstract
Earth and Planetary Science Letters, vol. 38, no. 2, Feb. 15, 1978, p. 373-384. Research supported by the National Research Cou
Mathematics
Logic
1
Breccia, Demagnetization, Lunar Evolution, Lunar Rocks, Magnetization, Temperature Effects, Apollo 17 Flight, Lunar Exploration, Lunar Geology, Mineralogy, Moon, Apollo 17, Station 6, Samples, Lunar, 76015, 76255, 76275, 76315, 76215, 76295, 76307, Boulders, Magnetic Properties, Breccias, Thermal History, Magnetization, Origin
Scientific paper
Twenty six samples from seven hand specimens, collected from the station 6 boulder at the Apollo 17 landing site, were studied magnetically. The boulder is a breccia consisting of three lithologic units distinguished by their clast population. The direction of magnetization of samples from unit B which is almost devoid of large clasts cluster fairly well after alternating field demagnetization. Samples from unit C which is characterized by abundant large clasts up to 1 m in size do not contain a uniform direction of magnetization but the distribution is not random. Based on these data we propose that the natural remanent magnetization (NRM) in these breccias is the vector sum of two magnetizations, a pre-impact magnetization and a partial thermoremanence acquired during breccia formation. The relative contribution of the two components is controlled by the thermal history of the ejecta, which in turn is determined by its clast population. Depending on the clast population, the NRM can be a total thermoremanence, a partial thermoremanence plus a pre-impact magnetization, or a pre-impact magnetization. This model of thermal overprinting might be applicable to all lunar breccias of medium and higher metamorphic grade.
Gose Wulf Achim
Pearce G. W.
Strangway David W.
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