Carbon and helium isotope systematics of North Fiji Basin basalt glasses: carbon geochemical cycle in the subduction zone

Details Carbon and helium isotope systematics of North Fiji Basin basalt glasses: carbon geochemical cycle in the subduction zone Carbon and helium isotope systematics of North Fiji Basin basalt glasses: carbon geochemical cycle in the subduction zone

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.154..127n&link_type=abstract

Earth and Planetary Science Letters, vol. 154, Issue 1-4, pp.127-138

Computer Science

14

Carbon, Helium, Isotopes, Basalts, Back-Arc Basins, Fiji

Scientific paper

We have measured 13 C values and CO 2 / 3 He ratios of vesicle-gas, and chemical compositions of North Fiji Basin basalt glasses, to estimate the contribution of subducted carbon in back-arc basin basalt quantitatively. It has made clear that the CO 2 / 3 He ratio increases and the 13 C value decreases with K 2 O content. Since the variety of K 2 O content of North Fiji Basin basalt is the result of two-component mixing, the variety of the CO 2 / 3 He ratio and 13 C value of the North Fiji Basin basalt should be mainly a result of mixing between the mantle component (low-CO 2 / 3 He, high- 13 C and low-K 2 O) and the subducted component (high-CO 2 / 3 He, low- 13 C and high-K 2 O). From a simple mass-balance calculation, it is derived that the subducted end-member source has 70% carbonate and 30% organic matter in origin. Assuming that complete decomposition of the subducted organic matter has occurred, most (~90%) carbonates, which subducted without accretion to wedge, is free from decomposition in North Fiji back-arc, since the subducting carbonate and organic matter throughout the North Fiji subduction zone are estimated in a proportion of 20:1. This may be one clue that carbonate can be transported into the mantle through the subduction zones.

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