Mathematics – Logic
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1211t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 5, pp.1211-1218
Mathematics
Logic
30
Scientific paper
The rate of accumulation of 4 He in the groundwaters of the J-aquifer of the Great Artesian Basin, Australia has been determined using 14 C and hydrologic ages. For groundwaters less than 50 Kyr in age, the 4 He accumulation rate is 4.6 × 10 -12 HeAU (where 1 HeAU = 1 cm 3 STP 4 He · cm H 2 O -3 · yr -1 ) in close agreement with in-situ production rate of 4 He (3.95 × 10 -12 HeAU) based on U and Th concentrations of 1.7 and 6.1, respectively, of the sandstone. For groundwaters older than 100 Kyr, the rate of 4 He accumulation is 2.91 × 10 -10 HeAU based on hydrologic ages; or 74 × the rate of in-situ production. The rate of 4 He "production" due to weathering of the aquifer rock is calculated to be ~10 -16 HeAU, indicating that the weathering input of 4 He is insignificant. If the groundwater of the GAB can be considered as a trap for the total crustal production of 4 He, the rate of 4 He accumulation under a steady-state flux is calculated to be 3.02 × 10 -10 HeAU, in agreement with the measured accumulation rate. It is concluded that over long times the 4 He accumulation rate in groundwater aquifers may be controlled by the whole crust flux of 4 He.
Clarke W. B.
Torgersen Thomas
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