Mineral | Size, mm | 4He, 10-6 cc/g | 3He, 10-9 cc/g | 4He/3He, 10-6 | SB-10, mass-fr. |
---|---|---|---|---|---|
Clinopyroxene | >0.315 | 186.5 | 0.207 | 0.901 | 0.018 |
Clinopyroxene | >0.16 | 375 | 0.167 | 2.24 | 0.037 |
Olivine I | >0.2 | 12.6 | 0.087 | 0.144 | 0.001 |
Olivine I | >0.315 | 8.9 | 0.141 | 0.0628 | 0.0005 |
Olivine II | >0.16 | 50 | 0.135 | 0.369 | 0.0047 |
Olivine II | >0.2 | 7.8 | 0.088 | 0.0885 | 0.0005 |
Olivine II | >0.315 | 38.4 | 0.246 | 0.155 | 0.0031 |
Olivine II | >0.4 | 54.2 | 0.165 | 0.327 | 0.005 |
Ti-magnetite | >0.16 (3 A) | 338 | 2.74 | 0.123 | 0.025 |
>0.20 (3 A) | 340 | 2.48 | 0.136 | 0.027 | |
>0.315(3 A) | 250 | 2.38 | 0.104 | 0.017 | |
>0.315(6 A) | 426 | 2.41 | 0.176 | 0.036 | |
The whole-rock sample has lost less than 0.5 of the
radiogenic in-situ produced He, therefore the present-day concentrations
of less movable 3He at least in Ol and Ti-Mgt should be similar to the
initial values. In the last column mass-fraction of Perovskite SB-10 is shown;
addition of this fraction to the host mineral (col. 1) would explain observed
range of 4He concentrations. A means Ampers: current under which the separation has been performed. |
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