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The Blake Ridge region lies on the passive margin of southeastern North America and contains a large amount of methane gas hydrate. The methane and methane gas hydrate are predominantly biogenic, apparently produced by CO 2 reduction. Reflection seismics indicate that bottom-simulating reflectors (BSRs) enclose ~55,000 km 2 , with high-amplitude BSRs covering ~26,000 km 2 ...
Data from piston cores collected from Carolina Rise and Blake Ridge, and from many DSDP/ODP sites indicate that extreme 13 C-depletion of methane and ΣCO 2 occurs within the uppermost methanogenic zone of continental rise sediments. We infer that 13 C-depleted methane is generated near the top of the methanogenic zone when carbon of 13 C-depleted ΣCO 2 , produced...
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