Clumped and oxygen isotopes reveal differential disequilibrium in the formation of carbonates from marine methane seeps
Geochimica et Cosmochimica Acta（2021）
Abstract
•δ13C-δ18O-Δ47 characterize methane-derived bivalve shells and cements from an Estuary.•Seep shells show full isotopic equilibrium due to slow precipitation.•Cements show unique Δ47 and δ18O positive offsets from marine signals.•Cements define a new differential disequilibrium domain for natural carbonates.•This isotope study refines the basis for interpreting ancient seep carbonates.
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Key words
Chemosynthesis,CO2 diffusion,Cements,Bivalve,Thyasira,St. Lawrence Estuary,Marine conditions,Equilibrium,Paleothermometry
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