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Aluminum‐26, sodium‐22 and cobalt‐60 in two drill cores and some other samples of the Jilin chondrite
Author(s) -
HEUSSER G.,
OUYANG Z.,
OEHM J.,
YI W.
Publication year - 1996
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.1996.tb02039.x
Subject(s) - chondrite , geology , mineralogy , radius , analytical chemistry (journal) , chemistry , meteorite , physics , computer security , chromatography , astronomy , computer science
— Two drill cores have been taken from the main mass of the Jilin chondrite, Jilin I. One was bored perpendicular to the 2π surface of the first exposure stage, the other parallel to this surface, and both intersected at the presumed 4π center of Jilin's second exposure stage. The probed depths were 65 cm and 105 cm, respectively, with a diameter of 26.5 mm. Fifteen drill core samples, 2 documented samples and 14 strewn field samples have been analysed for 26 Al, 60 Co and 22 Na. The reconstruction of the preatmospheric Jilin via 60 Co resulted in slight deviations for the center position and for the radius (now R = 80 +10 −5 cm) compared to an earlier study in 1985. The 60 Co production rate profile is now almost completely reproduced. A constant production rate of 22 Na and of 26 Al during the 4π irradiation is confirmed also for the center region. The good linear correlation of 26 Al and 21 Ne yields slightly revised irradiation ages for both stages of t 1 = 7 ± 1 Ma and t 2 = 0.32 +0.06‐ 0.03 Ma.