40Ar-39Ar ages of H-chondrite impact melt breccias
Swindle, Timothy D., Isachsen, Clark E., Weirich, John R., Kring, David A.(2009). 40Ar-39Ar ages of H-chondrite impact melt breccias. Meteoritics & Planetary Science, 44(5). https://doi.org/10.1111/j.1945-5100.2009.tb00766.x
Datasets
| number | title | Methods | variables analyzed | ||
|---|---|---|---|---|---|
| 1 | Estimated ages of events recorded by H chondrites from this study | AR_AR | AGE | ||
| 2 | Ages of heavily-shocked or shock-melted H chondrites | AR_AR | AGE | ||
Methods
| method name | laboratory | method comment | More details are available for the following variables | |
|---|---|---|---|---|
| AR40_AR39 AGE DETERMINATION | UNIVERSITY OF ARIZONA | All irradiations were at the University of Michigan Ford Reactor. J factors were (7.61 ± 0.06) × 10−2 for Ourique, (1.968 ± 0.024) × 10−2 for Gao-Guenie, NWA 2058, and LAP 02240, and (2.144 ± 0.004) × 10−3 for the other LaPaz meteorites. In all irradiation packages, samples of MMhb-1 hornblende were included as the primary irradiation monitor, while samples of CaF2 and K2SO4 were included to monitor interfering reactions producing various Ar isotopes from Ca and K, respectively |
