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The widespread methane emissions that were discovered in 2013 on the Aquitaine Shelf at water depth between 140 and 220m are associated with authigenic carbonate crusts that cover meter-high subcircular reliefs of 10–100m in diameter. These authigenic carbonates are primarily aragonite plus calcite and dolomite, which cement the fine- to medium-grained sandy sediment. The carbonate cement is often...
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