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Formation mechanism of deep natural hydrogen in the Sichuan Basin

Science China Earth Sciences 2025年第2期68卷 581-597页

作者： Xiaomei WANG Kun HE Chunlong YANG Hao XIE Xiaobo WANG Yitong LYU Linfeng XIE Shuichang ZHANG Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China Key laboratory of Petroleum Geochemistry China National Petroleum CorporationBeijing 100083China International Center for isotope Effects Research School of Earth Science and EngineeringNanjing UniversityNanjing 210023China

As a potential renewable and clean energy source,the distribution and exploration prospects of natural hydrogen have garnered widespread ***,the limitations in understanding the formation mechanisms and accumulation patterns of underground natural hydrogen have significantly constrained its efficient exploration and *** study reports H_(2)content and isotopes in natural gas from deep formations in sedimentary basins through geochemical analysis of 58 conventional gas samples from the Sinian to Triassic strata in the central Sichuan *** discovered that H_(2)content in deep natural gas in central Sichuan generally exceeds 0.1%,with a maximum of 1.6%,and hydrogen isotopes(δ^(2)H_(H_(2)))range from-850‰to-586‰.Analysis of the geological conditions,hydrogen generation mechanisms,and isotope fractionation characteristics in the study area confirms that microbial fermentation or in-situ organic matter cracking are not effective pathways for deep H_(2)*** with helium content and isotope analysis of the natural gas,it is inferred that the volcanic basement in the central Sichuan area is the potential source rock for natural H_(2)in the Sinian to Triassic ***,H_(2)originates from the radiolysis of water and hydrothermal reactions of Fe(Ⅱ)in the basement ***,a diffusion fractionation model reveals significant isotope fractionation during the migration and accumulation of deep H_(2)into sedimentary reservoirs,which lead to anomalously light δ^(2)H_(H_(2))in deep natural gas in central *** indicates that the underground natural hydrogen accumulation is in a long-term dynamic process,with simultaneous H_(2)accumulation and dissipation in the gas *** research not only elucidates the formation mechanism of deep H_(2)but also provides insights for the resource potential of natural hydrogen in sedimentary basins.

关键词： Natural H2 Sichuan Basin Hydrogen generation mechanism isotope fractionation

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Fresh insights into the onset of big mantle wedge beneath the North China Craton

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Acta Geochimica 2025年第1期44卷 145-162页

作者： Yingpeng Wang Xuance Wang Wen Zhang Xiaowei Yu Ligong Wang Jinhui Wang Peigang Zhu Yongbin Wang Shandong Institute of Geological Survey Ji’nan 250014People’s Republic of China Yunnan Key laboratory of Earth System Science Yunnan UniversityEast Outer Ring RoadChenggong DistrictKunming 650500Yunnan ProvincePeople’s Republic of China Key laboratory of Critical Minerals Metallogeny in Universities of Yunnan Province Yunnan UniversityKunming 650500People’s Republic of China Radiogenic isotope Facility School of Earth and Environment SciencesUniversity of QueenslandBrisbaneQLD 4072Australia

The onset of the big mantle wedge(BMW)structure beneath the North China Craton remains *** on the genesis of Late Mesozoic granites associated with gold deposits in the Jiaodong Peninsula above the BMW could provide fresh insights into this *** monzogranite from the Zhaoxian-Shaling gold district was intruded during 154-148 *** I-type granite has high-K calc-alkaline and metaluminous *** monzogranite formed at medium temperatures(718-770℃)and was generated in a thickened lower crust at depths within the stability field of *** monzogranite’s high zircon Ce^(4+)/Ce^(3+)and Eu_(N)/Eu_(N)^(*)values and low FeOT/MgO ratios,suggest that it formed in a high oxygen *** variableε_(Hf)(t)values with T_(DM2)of 1.93-2.87 Ga imply that it originated from the melting of ancient crust basement,with contributions from mantle-derived *** granite’s enrichment in LREEs and LILEs,and depletion in HREEs and HFSEs,along with its trace element tectonic discrimination diagrams and medium Sr/Y,indicate an adakite affinity in an active continental margin *** transition from S-type granites to I-type granites and finally to A-type granites observed in the eastern part of North China Craton suggests a shift in the tectonic environment from compression to *** change is also reflected in the transition from flat subduction to steep ***,the monzogranite was formed in a tectonic transition setting triggered by a change in the subduction angle of the PaleoPacific Ocean slab during the Late *** event may have marked the initiation of the BMW above the North China Craton.

关键词： Zircon U-Pb age Hf isotopic composition Jiaodong Peninsula North China Craton

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Interaction of Ca^(2+)and Fe^(3+)in co-precipitation process induced by Virgibacillus dokdonensis and its application

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Journal of Environmental Sciences 2025年第1期147卷 131-152页

作者： Huaxiao Yan Yuping Liu Haojuan Zhang Shengping Jin Zuozhen Han Jusun Woo Maurice E.Tucker Long Meng Xiangqun Chi Chao Han Yanyang Zhao Yueming Zhao Hui Zhao College of Chemical and Biological Engineering College of Earth Science and EngineeringShandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary MineralsShandong University of Science and TechnologyQingdao 266590China laboratory for Marine Mineral Resources Center for Isotope Geochemistry and GeochronologyQingdao National Laboratory for Marine Science and TechnologyQingdao 266237China School of Earth and Environmental Sciences Seoul National UniversitySeoul 08826Korea School of Earth Sciences University of BristolBristol BS81RJUK Cabot Institute University of BristolCantock’s CloseBristol BS81UJUK Qingdao West Coast New District First High School Qingdao 266555China

Biomineralization has garnered significant attention in the field of wastewater treatment due to its notable cost reduction compared to conventional *** reinjection water from oilfields containing an exceedingly high concentration of calcium and ferric ions will pose amajor hazard in ***,the utilization of biomineralization for precipitating these ions has been scarcely investigated due to limited tolerance among halophiles towards such extreme *** this study,free and immobilized halophiles Virgibacillus dokdonensis were used to precipitate these ions and the effects were compared,at the same time,biomineralizationmechanisms and mineral characteristicswere further *** results showthat bacterial concentration and carbonic anhydrase activitywere higher when additionally adding ferric ion based on calcium ion;the content of protein,polysaccharides,deoxyribonucleic acid and humic substances in the extracellular polymers also increased compared to *** ions were biomineralized into calcite and vaterite with mul-tiple *** to iron doping,the crystallinity and thermal stability of calcium carbonate decreased,the content of O-C=O,N-C=OandC-O-PO_(3) increased,the stable carbon isotope values became much more negative,andβ-sheet in minerals *** calcium concentrations facilitated ferric ion precipitation,while ferric ions hindered calcium *** immobilized bacteria performed better in ferric ion removal,with a precipitation ratio exceeding 90%.Free bacteria performed better in calcium removal,and the precipitation ratio reached a maximum of 56%.This research maybe provides some reference for the co-removal of calcium and ferric ions from the oilfield wastewater.

关键词： Calcium carbonate Calcium ion Ferric ion Biomineralization Co-removal Immobilization

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Spatial Patterns and Controlling Factors of Soil Organic Carbon and Total Nitrogen in the Three River Headwaters Region,China

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Chinese Geographical Science 2025年第1期35卷 131-148页

作者： CUI Qiao LI Zongxing FENG Qi ZHANG Baijuan ZHAO Yue Observation and Research Station of Eco-Hydrology and National Park by Stable isotope Tracing in Qilian Mountains/Key laboratory of Ecological Safety and Sustainable Development in Arid Lands Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China

The alpine ecosystem has great potential for carbon *** organic carbon(SOC)and total nitrogen(TN)are highly sensitive to climate change,and their dynamics are crucial to revealing the effect of climate change on the structure,function,and services of the ***,the spatial distribution and controlling factors of SOC and TN across various soil layers and vegetation types within this unique ecosystem remain inadequately *** this study,256 soil samples in 89 sites were collected from the Three River Headwaters Region(TRHR)in China to investigate SOC and TN and to explore the primary factors affecting their distribution,including soil,vegetation,climate,and geography *** results show that SOC and TN contents in 0-20,20-40,40-60,and 60-80 cm soil layers are 24.40,18.03,14.04,12.40 g/kg and 2.46,1.90,1.51,1.17 g/kg,respectively;with higher concentrations observed in the southeastern region compared to the northwest of the ***-way analysis of variance reveals that SOC and TN levels are elevated in the alpine meadow and the alpine shrub relative to the alpine steppe in the 0-60 cm soil *** structural equation model explores that soil water content is the main controlling factor affecting the variation of SOC and ***,the geography,climate,and vegetation factors notably indirectly affect SOC and TN through soil ***,it can effectively improve soil water and nutrient conditions through vegetation restoration,soil improvement,and grazing management,and the change of SOC and TN can be fully understood by establishing monitoring networks to better protect soil carbon and nitrogen.

关键词： controlling factors different soil layers soil organic carbon(SOC) soil total nitrogen(TN) alpine ecosystem the Three River Headwaters Region(TRHR),China

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Sr-Nd isotopic characteristics and their significance in provenance tracing of detrital sediment in major rivers and marginal seas of eastern China

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Science China Earth Sciences 2025年第2期68卷 523-537页

作者： Xiaobao GAO Chao LI Zhifei DUAN Yulong GUO Shouye YANG State Key laboratory of Marine Geology Tongji UniversityShanghai 200092China

Sr-Nd isotopes are widely utilized as reliable tracers in sediment provenance *** this study,we compiled 304 Sr and 335 Nd isotope data of fine-grained surface sediments collected from major rivers in eastern China,including the Huanghe River,Changjiang River,southeastern coastal rivers,and rivers in Taiwan Island,as well as from marginal seas(Yellow Sea and East China Sea)and the Okinawa *** comprehensive dataset allowed us to examine the spatial distribution patterns of these isotopes and their implications for provenance *** variations ofεNd values in the sediments in Changjiang and Huanghe Basins primarily reflect the diversity of sediment sources,whereas the^(87)Sr/^(86)Sr ratios are influenced by both grain size and source ***,the reduction in^(87)Sr/^(86)Sr ratios observed in the middle and lower Changjiang River is attributed to the inputs of sources characterized by distinct^(87)Sr/^(86)Sr signatures beyond mere grain size *** the southeastern coastal and Taiwan rivers,sediments in the tidal reaches of the Jiao River exhibit hybrid characteristics,a mix of Changjiang-derived sediment and those originating from local ***,the Min River and Jiulong River sediments predominantly reflect local sources,with minimal influence from the Changjiang *** significant isotopic variation of Sr-Nd isotopic characteristics observed between riverine sediments on the eastern and western sides of Taiwan Island underscores the diverse provenance heterogeneity of source rocks in the *** the marginal seas,our data indicates that the surface sediments in the central mud area of the South Yellow Sea and the southern Yellow Sea are predominantly sourced from the Changjiang River catchment,potentially augmented by inputs from Korean *** inner shelf sediments of the East China Sea are primarily influenced by Changjiang River inputs,whereas rivers in eastern Taiwan Island contribute to the sediments on

关键词： Sr-Nd isotope Provenance tracing Detrital sediments Eastern China rivers Marginal seas

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Cobalamin-dependent radical S-adenosyl-L-methionine protein functions with a partner to successively methylate tricyclic indole alkaloid for chuangxinmycin maturation and derivatization

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Science China Chemistry 2025年第1期68卷 308-316页

作者： Sili Wang Jiancheng Huang Yanan Du Wei Huang Yufeng Xue Xiaokun Xu Guannan Zhong Yuanyuan Shi Bin Hong Xiaoying Bian Wen Liu State Key laboratory of Chemical Biology Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China State Key laboratory of Microbial Technology Shandong UniversityQingdao 266237China National Health Commission(NHC)Key laboratory of Biotechnology for Microbial Drugs Institute of Medicinal BiotechnologyChinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100050China

Cobalamin(Cbl)-dependent radical S-adenosyl-L-methionine(SAM)proteins constitute the largest collection of the radical SAM superfamily that has hundreds of thousands of individual *** of these proteins are involved in the biosynthesis of pharmaceutically important natural products to catalyze chemically demanding *** the biosynthetic pathway of chuangxinmycin(CXM),a unique indole alkaloid antibiotic with potent anti-infective activity,functionalization of the characteristic thiopyrano[4,3,2-cd]indole scaffold by regio-and stereoselective C3-methylation is believed to rely on a Cbl-dependent radical process,which,however,remained to be reconstituted *** here report the dissection of this enzymatic process,which requires the incorporation of Cxm8,a Cbl-dependent radical SAM protein,with Cxm9,a DUF5825family protein that shares no homology to any proteins of known ***8 and Cxm9 function together by forming an unexpected heterodimeric complex that selectively catalyzes C3-methylation of the tricyclic indole-S-hetero ring system in a successive manner,achieving CXM and a recently identified,C3-dimethylated *** biochemical characterization,isotope labeling,structural simulation and bioinformatics analysis rationalized the catalysis of the Cxm8/Cxm9 complex and particularly the necessity of the DUF5825 protein for C3-methylase *** is the first example that a Cbl-dependent protein acts with a partner to exhibit radical SAM activity.

关键词： cbl-dependent radical SAM protein biosynthesis chuangxinmycin stereoselective methylation

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Comparative Mineralogical and Geochemical Compositions within the Fault Gouge in the Surface Exposures of the Mw7.9 Wenchuan Earthquake Fault and Their Implications for Mass Removal and Fluid-Rock Interactions

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Journal of Earth Science 2025年第1期36卷 266-274页

作者： Yangyang Wang Sijia Li Shiyuan Wang Deyang Shi Weibing Shen National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China Geological Exploration and Development Research Institute Chuanqing Drilling Engineering Co.Ltd.CNPCChengdu 610500China Sichuan Earthquake Agency Chengdu 610041China Institute of Geophysics China Earthquake AdministrationBeijing 100081China MLRKey laboratory of isotope Geology Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China

Geochemistry of the fault gouge record information on fault behaviors and environmental *** investigated variations in the mineralogical and geochemical compositions of the fault gouge sampled from the margin zone(MZ)to the slip central zone(CZ)of the fault gouge in the Beichuan-Yingxiu surface rupture zone of the Wenchuan *** show that the clay minerals contents increase from the MZ to CZ,and the quartz and plagioclase contents slight *** increasing enrichment in Al_(2)O_(3),Fe_(2)O_(3),and K_(2)O are observed toward the CZ;the decomposition of quartz and plagioclase,as well as the depletion of Si O_(2),Ca O,Na_2O,and P_(2)O_(5)suggest that the alkaline-earth elements are carried away by the *** can be explained that the stronger coseismic actions in the CZ allow more clay minerals to form,decompose quartz and plagioclase,and alter plagioclase to *** mass loss in the CZ is larger than that in MZ,which is maybe due to the more concentrated stress in the strongly deformed CZ,however other causes will not be excluded.

关键词： fault gouge mass transfer fluid-rock interactions geochemical transformation Wenchuan Earthquake

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Homogeneous and heavy potassium isotopic composition of global oceans

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Science Bulletin 2019年第23期64卷 1740-1742页

作者： Madeline Hille Yan Hu Tian-Yi Huang Fang-Zhen Teng isotope laboratory Department of Earth and Space Sciences University of Washington

The oceans are an important interface for chemical exchange between the continents,the seafloor,and the *** weathering of continental silicate rocks removes atmospheric CO2 and releases rock-forming cations to the oce... 详细信息

关键词： oceans isotopic runoff

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New Potential Barite Reference Materials for LA-MC-ICP-MS Sulfur isotope Analysis with Application to Hydrothermal Barite in the Huayangchuan Deposit,Western China

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Journal of Earth Science 2025年第1期36卷 1-10页

作者： Jiali Fu Xinqian He Zhaochu Hu Shuo Yin Jian Ma Kaiyun Chen Wen Zhang National Key laboratory of Uranium Resource Exploration-Mining andNuclear Remote Sensing East China UniversityofTechnologyNanchang 330013China State Key laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Earth Sciences East China University of TechnologyNanchang 330013China State Key laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430078China State Key laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China

Sulfur isotopes of S-bearing materials are powerful tools to trace various geological processes and sulfur sources in earth sciences,especially in ore deposits where sulfide-sulfate pair coprecipitates ***,in-situ S isotope determination of barite is challenging without natural matrix-matched reference *** this study,we present two natural barite reference materials(1-YS and 294-YS)for in-situ sulfur isotopic *** LA-MC-ICP-MS laboratories were utilized to test theδ34S micron-scale homogeneity of 1-YS and 294-YS barites that have 2s repeatabilities of better than±0.45‰and±0.41‰,***,the in-situ analysis results are consistent with the results of the bulk analysis by GS-IRMS within *** grand meanδ~(34)S values of 1-YS(13.37‰±0.42‰,2s)and 294-YS(14.38‰±0.44‰,2s)are the final recommended values obtained from four independent *** the results confirm the suitability of 1-YS and 294-YS barite used as calibration materials with respect to in-situ S isotopic ***,the new developed barite reference materials were used as matrix-matched standard to calibrate the barite samples from the Huayangchuan carbonatite-hosted U-polymetallic deposit(Qinling orogenic belt,western China)to obtainδ34S *** the temperaturedependentδ34S fractionation of barite-pyrite pair,we calculate the formation temperature of barite(i.e.,506 to 537°C)and theδ34S value of mineralizing fluid(i.e.,-7.11‰to-7.59‰)in the Huayangchuan *** results indicate an involvement of sedimentary sulfur,presumably acting as a potential uranium source(e.g.,upper crustal materials)for the giant Huayangchuan deposit.

关键词： LA-MC-ICP-MS S isotope reference material barite geothermometry

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Abiotic aerobic oxidation pathways of stibnite revealed by oxygen and sulfur isotope systematics of sulfate

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Journal of Environmental Sciences 2025年第1期147卷 83-92页

作者： Ningjie He Shu Li Xiaoqian Li Yaning Tang Jiaxue Yang Jianwei Zhou School of Environment Studies China University of GeosciencesWuhan 430074China Key laboratory of Mine Ecological Effects and Systematic Restoration Ministry of Natural ResourcesBeijing 100081China State Environmental Protection Key laboratory of Source Apportionment and Control of Aquatic Pollution Ministry of Ecology and EnvironmentWuhan 430074China Institute of Geological Survey China University of GeosciencesWuhan 430074China

The environmental threat posed by stibnite is an important geoenvironmental issue of current *** better understand stibnite oxidation pathways,aerobic abiotic batch experiments were conducted in aqueous solution with varyingδ^(18)O_(H_(2)O) value at initial neutral pH for different lengths of time(15-300 days).The sulfate oxygen and sulfur isotope compositions as well as concentrations of sulfur and antimony species were *** sulfur isotope fractionation factor(△^(34)S_(SO4-stibnite))values decreased from 0.8‰to-2.1‰during the first 90 days,and increased to 2.6‰at the 180 days,indicating the dominated intermediate sulfur species such as S_(2)O_(3)^(2-),S0,and H_(2)S(g)involved in Sb2S3 oxidation *** incorporation of O into sulfate derived from O_(2)(~100%)indicated that the dissociated O_(2)was only directly adsorbed on the stibnite-S sites in the initial stage(0-90 days).The proportion of O incorporation into sulfate from water(27%-52%)increased in the late stage(90-300 days),which suggested the oxidation mechanism changed to hydroxyl attack on stibnite-S sites promoted by nearby adsorbed O_(2)on stibnite-Sb *** exchange of oxygen between sulfite and water may also contributed to the increase of water derived O into SO42-.The new insight of stibnite oxidation pathway contributes to the understanding of sulfide oxidation mechanism and helps to interpret field data.

关键词： Sulfide oxidation δ^(34)S_(SO4) δ^(18)O_(SO4) Oxygen source of sulfate

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