The rare gas inventory of the continental crust, recovered by the KTB Continental Deep Drilling Project

Details The rare gas inventory of the continental crust, recovered by the KTB Continental Deep Drilling Project The rare gas inventory of the continental crust, recovered by the KTB Continental Deep Drilling Project

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.154..247d&link_type=abstract

Earth and Planetary Science Letters, vol. 154, Issue 1-4, pp.247-263

Computer Science

6

Atmosphere, Continental Crust, Ktb, Mantle, Helium, Noble Gases

Scientific paper

The rare gas inventory of the continental crust as mirrored in the continental metamorphic rocks from the "KTB" deep drilling site in NE Bavaria, Germany, has been investigated through systematic isotope analysis of 47 whole-rock samples and 10 mineral separates from the drill core. The measured concentrations confirm a very low crustal inventory of noble gases relative to the atmosphere ( 0.2%). The presence of a mantle helium component is identified by 3 He excess leading to a range of 2×10 -8 3 He/ 4 He 6.5×10 -6 for the He isotopic ratio. Excesses of 21 Ne and of heavy xenon isotopes demonstrate the presence of nucleogenic and fissionogenic gases. The acquired data have enabled us to estimate loss rates of 4 He, 21 Ne nucl , 40 Ar and 136 Xe fiss from typical crustal rocks. The global extension of these rates to the continents yields degassing fluxes of (2-3)×10 10 atoms m -2 s -1 for 4 He, 900-2100 atoms m -2 s -1 for 21 Ne and (1-6)×10 9 atoms m -2 s -1 for 40 Ar, in good agreement with theoretical estimates from atmospheric models and from accumulated gases in crustal fluids.

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