3 He and methane in the Gulf of Aden

Details 3 He and methane in the Gulf of Aden 3 He and methane in the Gulf of Aden

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..111j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 1, pp.111-116

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Scientific paper

During the OCEAT cruise (July, 1987), the vertical and spatial distributions of 3 He and methane were measured at six stations over the West Sheba Ridge (Gulf of Aden). The results show significant 3 He anomalies (up to 49%). We conclude that the origin of this signal is independent from the well-known Red Sea hydrothermal 3 He (of Red Sea Brines). Thus, active hydrothermalism occurs in this extensional basin associated with spreading along an incipient mid-ocean ridge. The 3 He input from the Gulf of Aden accounts for the S-N positive gradient in 3 He concentration observed in the western part of the Indian Ocean. Several methane anomalies are also present (up to 664 nl/l, i.e., 25 times the regional methane background), but the CH 4 and 3 He signals are not systematically correlated, suggesting complex production and consumption mechanisms of methane in these areas. Our results confirm previous observations in the South West Pacific Ocean.

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