Zice Jia

Shanghai Ocean University

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Dong Feng

Qingdao National Laboratory for Marine Science and Technology

Shanggui Gong

Shanghai Ocean University

Xudong Wang

Shanghai Ocean University

Germain Bayon

Ifremer

Jörn Peckmann

Universität Hamburg

Yu Hu

Shanghai Ocean University

Duofu Chen

Shanghai Ocean University

Jie Li

Chongqing Jiaotong University

Harry H. Roberts

Institute of Geography and Spatial Organization, Polish Academy of Sciences

Xiaomei Nian

East China Normal University

Cooperative Institutions

Chinese Academy of Sciences

Shanghai Ocean University

East China Normal University

University of Chinese Academy of Sciences

Qingdao National Laboratory for Marine Science and Technology

Northwest A&F University

Guangzhou Institute of Geochemistry

Institute of Oceanology

Louisiana State University

Hainan University

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Heavy sulfur isotopes recorded in contrasted redox conditions in Holocene sediments from the Yangtze River Delta

Chemical Geology (2024)

Yinglu Chen Weiguo Zhang Xiaomei Nian Yongjie Wang Ian Snowball

Yangtze river

10.1016/j.chemgeo.2024.122251

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Molybdenum Isotope Fingerprinting of Microbial Sulfate Reduction in Seep Carbonate Rocks

Geochemistry Geophysics Geosystems (2024)

Zice Jia Yu Hu Germain Bayon Jörn Peckmann Xudong Wang

Abstract Understanding the interaction between molybdenum (Mo) and organic matter during microbial sulfate reduction is critical for the use of Mo to reconstruct marine redox conditions throughout Earth's history. However, little is known about Mo isotope fractionation and how it relates to organic matter remineralization during microbial sulfate reduction. Here, we report Mo abundances and isotopic (δ 98 Mo) compositions for bulk‐rock, non‐lithogenic and sequentially extracted fractions, including carbonate ( carb ), pyrite, and organic matter ( OM ), of seep carbonate rocks. Our data indicate that the difference between δ 98 Mo carb and δ 98 Mo OM (Δ 98 Mo carb‐OM ) displays significant variability in the studied samples, ranging between 0.72 and 1.01‰. Remarkably, the obtained Δ 98 Mo carb‐OM values indicate correlative trends with stable carbon isotope ratios and bulk abundances of (a) total organic carbon, (b) Mo, and (c) pyrite in seep carbonates, which we interpret as reflecting sustained adsorption of isotopically light Mo onto organic matter during enhanced sulfate reduction. On this basis, we put forward the concept that Δ 98 Mo carb‐OM of authigenic carbonate rocks can be used as a measure of the intensity of sulfate reduction and for reconstructing past interactions between Mo and organic matter in marine sediments.

Authigenic

10.1029/2023gc011379

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Molybdenum isotope signature of microbial nitrogen utilization in siboglinid tubeworms

Geology (2023)

Xudong Wang Ting Xu Jörn Peckmann Germain Bayon Zice Jia

Abstract Many chemosynthesis-based communities prospering in deep-sea environments rely on the metabolic activity of sulfide-oxidizing bacteria. This is the case for vestimentiferan siboglinid tubeworms, whose demand for nutrition is satisfied predominantly by their endosymbiotic bacteria harbored in a specialized organ called the trophosome. Such chemosymbiosis leads to a significantly lower nitrogen isotope composition of the trophosome than in other types of soft tissue. However, the specific process of nitrogen utilization by siboglinids remains unclear. As a key element in the relevant enzymes (nitrogenase and nitrate reductase), molybdenum (Mo) is indispensable in the biogeochemical cycling of nitrogen. The Mo isotope composition (δ98Mo) of siboglinids is thus a potential proxy for decoding the processes involved in nitrogen metabolism. In this study, we found δ98Mo values along the chitinous tube of the vestimentiferan siboglinid Paraescarpia echinospica from the Haima seeps of the South China Sea as negative as −4.59‰ (−1.13‰ ± 1.75‰, 1SD, n = 19)—the lowest δ98Mo value ever reported for any kind of natural material. It is suggested that this extremely negative Mo isotope composition is caused by preferential utilization of isotopically light Mo by the tubeworm’s endosymbionts or epibionts during nitrate reduction. Such Mo isotope signature could provide a means for identifying siboglinid tubeworms, a group of annelids that has previously escaped unambiguous identification due to the lack of mineralized skeleton, in the rock record.

Biogeochemical Cycle

Isotopes of nitrogen

Nitrogen Cycle

Isotopic signature

10.1130/g51077.1

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Behaviors of trace elements under varying methane seepage intensity: Insight from tubular seep carbonates in the South China Sea

Marine and Petroleum Geology (2024)

Z. Chen Zice Jia Shanggui Gong Jiangtao Li Gilad Antler

Petroleum seep

Cold seep

10.1016/j.marpetgeo.2024.106816

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The molybdenum isotope signature of microbial nitrogen utilization

Xudong Wang Jörn Peckmann Germain Bayon Zice Jia Shanggui Gong

Many chemosynthesis-based communities prospering in deep-sea environments rely on the metabolic activity of sulfur-oxidizing bacteria. This is also the case for vestimentiferan siboglinid tubeworms, whose demand for nutrition is entirely satisfied by their endosymbiotic bacteria harbored in the trophosome. Such chemosymbiosis leads to a significantly lower nitrogen isotope composition of the trophosome than in other types of soft tissue. However, the specific process of nitrogen utilization by siboglinids remains unclear. As a key element in the relevant enzymes (nitrogenase, nitrate reductase), molybdenum (Mo) is indispensable in the biogeochemical cycling of nitrogen. The Mo isotope composition (δ98Mo) of siboglinids is thus a potential proxy to decode the mode of nitrogen utilization. In this study, we found that δ98Mo along the chitinous tube of the vestimentiferan siboglinid Paraescarpia echinospica from the Haima seep of the South China Sea yields values as negative as -4.59‰ (-1.13 ± 1.75‰, n = 19) – the lowest δ98Mo signature ever reported for any kind of natural material. It is suggested that this extremely negative Mo isotope composition is caused by preferential utilization of isotopically light Mo by the tubeworm symbionts during nitrate reduction. Such Mo isotope signature could provide a means to identify siboglinid tubeworms in the rock record, a group of annelids that has previously escaped unambiguous identification due to the lack of mineralized skeleton.

Biogeochemical Cycle

Isotopes of nitrogen

Isotopic signature

Nitrogen Cycle

10.5194/egusphere-egu23-10760

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Seawater‐Fluid Composition Records From Molybdenum Isotopes of Sequentially Extracted Phases of Seep Carbonate Rocks

Geochemistry Geophysics Geosystems (2023)

Zice Jia Yu Hu Germain Bayon Jörn Peckmann Xudong Wang

Abstract Authigenic molybdenum (Mo auth ) in marine sediments holds great potential to archive the Mo isotopic composition of seawater and biogeochemical processes. However, the factors that control authigenic Mo isotope (δ 98 Mo auth ) distribution patterns remain poorly constrained. Here, we report Mo abundances and δ 98 Mo compositions for bulk‐rock ( bulk ) and sequentially extracted fractions—including total authigenic ( auth ; i.e., non‐lithogenic fraction), carbonate ( carb ), iron and manganese oxyhydroxides, pyrite ( py ), and organic fractions ( OM )—of authigenic carbonates recovered from various hydrocarbon seep sites in the Gulf of Mexico and the South China Sea. Extracted pyrite fractions exhibit Mo contents varying from 0.1 to 23.4 μg/g and generally dominate the Mo budget of seep carbonate rocks. Our data indicate large ranges of δ 98 Mo bulk and δ 98 Mo auth values relative to NIST 3134 (0.25‰), varying from 1.02 to 1.98‰ ( n = 4) and from 0.15 to 3.07‰ ( n = 34), respectively. The difference in δ 98 Mo values between carbonate and pyrite fractions of seep carbonate rocks formed under sulfidic conditions increases with higher Mo auth contents, suggesting a control of dissolved hydrogen sulfide concentrations on Mo isotope fractionation during carbonate precipitation. Compared with δ 98 Mo auth and δ 98 Mo py , δ 98 Mo carb of seep carbonate rocks formed under sulfidic conditions shows a relatively narrow range with an average of 1.98 ± 0.31‰ (1 SD; n = 10), providing constraints on the δ 98 Mo composition of seawater in the course of Earth history. Overall, our findings show that the δ 98 Mo composition of sequentially extracted phases of carbonate‐rich sedimentary rocks can provide insights into seawater‐sediment interactions and biogeochemical pathways of Mo during early diagenesis.

Authigenic

10.1029/2023gc011128

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Citations (8)