Abstract The Loki's Castle vent field at the ultraslow-spreading Arctic Mid-Ocean Ridge (AMOR) hosts a low-temperature venting area, which is characterized by microbial mats and numerous up to 1 m tall barite chimneys. An actively-venting barite chimney yielded δ18OSO4 and δ34SSO4 values heavier than ambient seawater and sulfide-oxidizing bacteria in microbial mats identified microbial sulfate reduction and sulfide oxidation as the main processes. In order to investigate the chemical and microbial structure below the barite field, we obtained two gravity cores and present chemical composition (e.g., H2S, SO42−, NH4+, DIC) and stable isotope data for the pore fluids (δ34SSO4, δ13CDIC) together with stable isotope (δ13Corg, δ34S, ∆33S) and lipid biomarker data on bulk sediments. The gravity core more distant to the high-temperature vents shows seawater-like pore fluid profiles with only minor vent fluid contribution (

中文翻译：

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低温重晶石场中的海底硫循环：来自北极洛基城堡喷口场的多代理研究

摘要 位于北极中洋脊 (AMOR) 的洛基城堡通风场拥有一个低温通风区，其特征是微生物垫和众多高达 1 m 的重晶石烟囱。积极通风的重晶石烟囱产生的 δ18OSO4 和 δ34SSO4 值高于环境海水，微生物垫中的硫化物氧化细菌确定微生物硫酸盐还原和硫化物氧化是主要过程。为了研究重晶石场下方的化学和微生物结构，我们获得了两个重力核心，并提供了孔隙流体的化学成分（例如 H2S、SO42−、NH4+、DIC）和稳定同位素数据（δ34SSO4、δ13CDIC）以及大块沉积物的稳定同位素（δ13Corg、δ34S、Δ33S）和脂质生物标志物数据。