Title: Cold seep activities recorded by geochemical characteristics of authigenic carbonates from Green Canyon 140,Gulf of Mexico
Abstract: Seep carbonates collected from Green Canyon block 140,Gulf of Mexico,could be divided into three types: nodule-rich carbonates,bioclast-rich carbonates and massive carbonates.XRD investigation shows that high Mg-calcite and aragonite are the dominate minerals.Additionally,nodule-rich carbonates contain minor amounts of dolomite and bioclast-rich carbonates include some low Mg-calcite.Peloids,clotted microfabric and pyrite framboids are developed in carbonates and suggest a genesis linked with bacterial activities.The carbonates exhibit a large variation in δ13C values(-36.1‰ to 5.1‰),suggesting multiple carbon sources that include thermogenic methane,seawater and residual CO2 from methanogenesis.Shells cemented in nodule-rich carbonates show 14C ages between 46.5 ka and 25.8 ka BP,bioclast-rich carbonates formed from 17.6 ka to 11.7 ka BP,and massive carbonates have 14C ages of 1.2 ka BP,suggesting that seep activity was discontinuous.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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