Deep methane maxima and 3 He anomalies across the Pacific entrance to the Celebes Basin

Details Deep methane maxima and 3 He anomalies across the Pacific entrance to the Celebes Basin Deep methane maxima and 3 He anomalies across the Pacific entrance to the Celebes Basin

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2673b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 10, pp.2673-2680

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Scientific paper

Methane and 3 He measurements have been performed in deep waters across the sills between the Pacific Ocean and Celebes Basin. The in situ analyses of dissolved methane have led to the identification of several methane seeps along the flanks of the two South Mindanao submarine ridges (Sangihe and Talaud East-Mindanao). 3 He excesses in the Celebes Basin and East of Talaud East-Mindanao Ridge at 2000-3000 meter depths are in the range 21-22%, a few percent above the Philippine Sea 3 He background. The isotopic ratio of the added He is 1.8 times the atmospheric ratio, which indicates an input of hydrothermal fluids involving both mantle and crustal/sedimentary components. Methane anomalies are partially associated with these 3 He excesses. The order of magnitude of the CH 4 / 3 He ratios is comparable to those observed in spreading axis hydrothermal fields. At a few tens of kilometers from the top of the Sangihe Ridge, conversely, a major methane anomaly (90 times greater than the CH 4 , background of the Philippine Sea deep waters) was measured at a depth where the waters show no 3 He enrichment or anomalous water temperature versus the Philippine Sea background. This result implies that methane could originate largely from shallow sedimentary layers.

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