Table 2: Measured He concentrations and isotope ratios in olivine crystals from basaltic-hawaiitic lava flows from Linosa, Pantelleria and Ustica volcanic islands.

SampleWeight (g)Number of strokes cumulativeR/Ra4He cumulative (10−8 cm3  STP/g)R/Ra  cumulative

Linosa
Lin 150.502141007.273.587.27
2007.823.96 ± 0.047.3 ± 0.2

Lin 20-10.512711007.534.237.53
2007.365.067.50
3006.435.407.44
4007.525.61 ± 0.047.4 ± 0.2

Lin 20-20.499581007.574.047.57
2007.554.917.56
3007.535.387.56
4007.545.62 ± 0.047.6 ± 0.2

Lin 270.500581006.994.486.99
2007.264.777.00
3007.014.90 ± 0.047.0 ± 0.2

Pantelleria
Pant 8A0.541771007.650.249 ± 0.0057.6 ± 0.3

Ustica
Ust 10.501261007.6811.497.68
2007.5613.007.67
3007.8013.967.68
4007.2114.617.66
5008.1415.057.67
6007.9715.407.68
7008.2415.7 ± 0.17.7 ± 0.2

Ust 20.501461007.6714.857.67
2007.4317.347.63
3007.6118.437.63
4006.9619.317.60
5007.4019.737.60
6007.6020.187.60
7007.5820.657.60
8007.5420.9 ± 0.17.6 ± 0.2