Lunar Meteorite SaU 300 - Noble Gas Record

Sayh al Uhaymir 300 (SaU 300) is a polymict crystalline im-pact-melt breccia dominated by feldspathic components with small HMS contribution [1, 2]. Here we discuss the noble gas record of SaU 300. Noble gas components have been separated according [3] and production rates are calculated on composition [2] according [4]. A chip weighing 100.9 mg from SaU 300 has been measured for noble gases at the Laboratory for Earthquake Chemistry, Univ. of Tokyo by a stepwise heating method: 600, 800, 1000, 1200 and 1800°C. It showed a maximum release at 1000°C, whereas other noble gases were mostly released at 1800°C. At the 600 and 800°C, Ne isotopic ratios are interpreted as a mixture between terrestrial atmospheric and cosmogenic components, but at the higher tem-peratures trace amount of SEP-Ne, [