Abstract
Abstract Authigenic carbonate chemistry and mineralogy provide key insights into diagenetic pathways and microbial processes in sedimentary records. We characterize the mineralogy, elemental composition, and isotopic composition of 28 authigenic carbonate nodules recovered from coal-bearing forearc sediments offshore Shimokita Peninsula (Japan) to better understand fluid sources, diagenetic environments, and biogeochemical processes associated with subsiding sediments containing high organic carbon content. The carbonate nodules were collected at Integrated Ocean Drilling Program (IODP) Site C0020 from sediment cores between 1604 and 2460 m below seafloor (mbsf) spanning a transition from terrestrial to marine depositional environments. These carbonates range from
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