Zhiwei He

Tongji University

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Shouye Yang

Tongji University

Fang Huang

University of Science and Technology of China

A. Vargas

Tongji University

Huimin Yu

University of Science and Technology of China

Zhilong Huang

Institute of Geochemistry

Qiang Hao

Ministry of Natural Resources

Junjie Guo

Shanghai University

Corey Archer

Washington University in St. Louis

Zhenzhong Xiang

Chinese Academy of Sciences

Yusi Hu

University of Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

Institute of Geochemistry

University of Science and Technology of China

Tongji University

University of Chinese Academy of Sciences

Ministry of Natural Resources

State Key Laboratory of Marine Geology

ETH Zurich

Guizhou University

Chengdu University of Technology

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Ore genesis of the Yadu carbonate-hosted Pb–Zn deposit in Southwest China: Evidence from rare earth elements and C, O, S, Pb, and Zn isotopes

Ore Geology Reviews (2021)

Zhiwei He Zeqin Li Bo Li Jun Chen Zuopeng Xiang

δ34S

Isotope Geochemistry

Rare-earth element

Basement

Uraninite

Metallogeny

10.1016/j.oregeorev.2021.104039

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Citations (17)

Unusually heavy Cu isotope signatures of the Changjiang (Yangtze) River: The impact of chemical weathering and delivery to the oceans

Goldschmidt Abstracts (2022)

A. Vargas Junjie Guo Zhiwei He Shouye Yang Ni Su

Yangtze river

10.46427/gold2022.9313

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Sedimentary cycling of zinc and nickel and their isotopes on an upwelling margin: Implications for oceanic budgets and paleoenvironment proxies

Geochimica et Cosmochimica Acta (2022)

Zhiwei He Corey Archer Shouye Yang Derek Vance

Zinc and Ni are essential micronutrients whose stable isotope systematics in marine sediments represent promising, but still developing, tracers of past ocean chemistry and biology. Sediments from upwelling continental margins have been identified as important sinks for Zn and Ni, driven by high productivity, incorporation of the metals into cells and organic carbon burial. At present, however, our understanding of how Zn and Ni isotope composition of upwelling sediments reflects specific processes in the water column is incomplete. Here, we present coupled Zn and Ni abundance and isotope data for both solid phase and porewater in a series of sediment cores collected on a shelf-to-slope transect across an oxygen minimum zone (OMZ) from the southwest African margin off Namibia. Zinc/Al and Ni/Al ratios in Namibian margin sediments are elevated relative to the lithogenic background, by factors of 1.4–2.4 and 1.7–5.7, respectively. Systematic relationships between solid phase Zn and Ni concentrations and organic carbon accumulation corroborate the view that authigenic Zn and Ni are mainly delivered to these sediments via export production from the photic zone. Corrections for detrital Ni are sometimes substantial, but authigenic δ60Ni values are within uncertainty of the modern deep ocean, at 1.38 ± 0.18 ‰ (mean and 1SD, n = 42). Authigenic δ66Zn is more variable, at −0.09 to 0.50 ‰, at or below the value for the deep ocean average. This latter observation can be attributed to Zn isotope fractionation during sequestration into authigenic ZnS phases in the sediments, either quantitatively, or partially. Porewater systematics are more complex and the profiles do not necessarily reflect the redox state of the sediment-porewater system at the time of sampling, but rather characteristics inherited from more reducing conditions in a temporally heterogeneous system. Porewater zinc concentrations (30–369 nM) are much higher than the deep ocean and increase with depth beneath the sediment–water interface. Despite this prominent increase in Zn concentrations, δ66Zn is rather constant and lighter than the deep ocean average, at 0.18 ± 0.06 ‰ (mean and 1SD, n = 33). These observations are most consistent with the buffering of the small porewater pool by the dissolution of a previously formed sulfide phase. Porewater Ni concentrations are closer to the deep ocean, mostly at 5–15 nM. The lightest porewater isotope compositions (δ60Ni as low as 0.15 ‰) are consistent with a Mn-oxide source of Ni, whereas the heaviest isotope compositions (up to 1.76 ‰) clearly reflect uptake of light Ni into sulfide at depth within the sediment. Our data, for the largest upwelling site in the modern ocean, add to sparse data from the eastern Pacific, and confirm that upwelling margin sediments bury Ni that is close to the deep ocean in isotope composition, but Zn that is generally lighter. The data thus confirm the importance of such margins in setting the heavy isotope composition of oceanic Zn. Sediments from this kind of setting hold significant potential for the construction of records of past oceanic Ni isotopes.

Authigenic

Continental Margin

Isotopes of zinc

10.1016/j.gca.2022.12.026

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Citations (18)

Source of ore-forming materials and ore genesis of the Liangyan lead-zinc deposit in the northwestern Guizhou

Kuangwu xuebao. (2024)

Tao Wu Zhilong Huang Zhiwei He Jun Chen Zhenzhong Xiang

The Northwestern Guizhou Pb-Zn metallogenic area is a significant part of the Sichuan-Yunnan-Guizhou Pb-Zn metallogenic province. Orebodies of Pb-Zn deposits in this area are hosted in multi-layers of strata, structurally constrained by the thrusting fault-fold system and close spatially related to the Permian Emeishan basalt. However, there are still some controversies on the source of the ore-forming materials and the genesis of those deposits because of relatively limited researches. In this study, taking the Liangyan Pb-Zn deposit in the Northwestern Guizhou as research object, we have carried out the Pb isotopic analysis of sulfide minerals and C-O isotopic analysis and REE elemental analysis of ore-stage calcites from the deposit, aiming to elucidate the source of ore-forming materials and the genesis of the carbonate-hosted lead-zinc deposit in the northwestern Guizhou. The C-O isotopic data of calcites indicate that the carbon of ore-forming fluids was predominantly sourced from the dissolution of the Carboniferous carbonate host rocks with a minor contribution from organic matter within the sedimentary sequences. The oxygen was possibly derived from the hot basinal brine and ore-hosting carbonate rocks. The Pb isotopes of sulfide minerals and the REE compositions of calcites suggest that the ore-forming metals and rare earth elements within the ore-forming fluids were mainly originated from the binary mixture of the Mesoproterozoic Kunyang Group metamorphic basement and the ore-hosting Carboniferous carbonate rock. Combined with geological and geochemical characteristics of the Liangyan Pb-Zn deposit, it is suggested that the Liangyan deposit belongs to a thrusting fault-fold system-controlled MVT Zn-Pb deposit.

Lead (geology)

Ore genesis

Iron ore

10.3724/j.1000-4734.2024.44.019

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Field test and numerical simulation of ground settlement in super shallow buried station excavation supported by transverse pipe roof

Frontiers in Earth Science (2023)

Jun Wang Xun Li Shengzhi Wu Zhiwei He Yuanjin Wei

The pipe roof is an effective means to control the surface settlement during the construction of the super-shallow buried subway station. The transverse pipe roof method can not only reduce the construction work surface, but also improve the construction efficiency by multi-stage flow construction. Based on the transfer station project of the Olympic Sports Center of Jinan Rail Transit Line 3, the ground settlement law caused by the excavation of ultra-shallow buried subway station under the action of transverse pipe roof is analyzed through field measurement. The mechanism of pipe roof controlling ground settlement and the influence of steel pipe spacing and steel pipe length on the bearing mechanism of pipe roof are analyzed by numerical simulation. The following conclusions are drawn. 1) The surface settlement curve caused by the excavation of the small pilot tunnel in the lateral direction of the station is a wavy U-shaped, and the surface settlement curve becomes a smooth U-shaped after the soil is broken. In the longitudinal direction of the station, the surface settlement is jagged, and the surface settlement above the pipe roof is less than the surface settlement between the pipe roofs. 2) After soil excavation, pipe roof can bear the load of surrounding rock and restrain the settlement of soil above, and soil arch effect is formed between pipes to restrain the relaxation of soil between pipes. With the increase of the spacing of the steel pipe, the height of the soil arch increases. After exceeding a certain spacing, the micro-soil arching effect disappears and the surface settlement increases. 3) The length and stiffness of pipe roof will affect the bearing capacity of pipe roof and there is an upper limit. When it exceeds the upper limit, increasing the length or stiffness of pipe roof has little effect on the control effect of ground settlement. The research can provide reference for shallow buried excavation station and other projects.

Settlement (finance)

Geogrid

10.3389/feart.2023.1136270

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Citations (5)

Sulfide S-Zn-Cd isotopes and origin of the Liangyan Zn-Pb deposit in the Sichuan-Yunnan-Guizhou metallogenic province, SW China

Journal of Asian Earth Sciences (2023)

Tao Wu Yufan He Zhiwei He Zhilong Huang Lin Ye

Dolostone

δ34S

10.1016/j.jseaes.2023.105804

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Citations (3)

Temporally and spatially dynamic redox conditions on an upwelling margin: The impact on coupled sedimentary Mo and U isotope systematics, and implications for the Mo-U paleoredox proxy

Geochimica et Cosmochimica Acta (2021)

Zhiwei He Matthew O Clarkson Morten B. Andersen Corey Archer Tim Sweere

The abundances and isotope compositions of molybdenum (Mo) and uranium (U) in ancient sediments are promising tracers of the redox state of the past ocean, whose basis lies in the environmentally dependent Mo and U isotope signatures in modern oceanic settings. Despite their dominance in oceanic budgets, the controls on the Mo-U systematics of upwelling margin sediments remain to be fully understood. Here we present a comprehensive sediment-porewater Mo and U isotope study in the Benguela upwelling system off Namibia, including the first dataset incorporating coupled Mo-U abundance and isotope analysis of both solid authigenic phases and porewaters. The investigated stations represent shelf-to-slope settings, which lie on the upper edge, within and below the oxygen minimum zone (OMZ) of the South Atlantic. The sediments across all stations share similar characteristics: both Mo and U show increasing authigenic enrichment with depth, coupled to an overall decrease in δ98Moauth (from ~2.0‰ to 1.3‰ and from ~2.0‰ to 0.3‰) and increase in δ238Uauth (from −0.18‰ to 0.05‰ and from −0.34‰ to −0.21‰). Nevertheless, the extents of Mo and U enrichment and associated isotopic fractionations display spatial variability across the OMZ, reflecting variations in local sedimentary redox conditions. Porewater Mo and U concentration patterns are more complex, exhibiting peaks in Mo and U abundance well in excess of seawater (up to 8 times seawater for Mo) associated with correlated shifts in isotope composition. As a result, porewaters exhibit a wide range in isotope compositions, between 0.90‰ and 2.79‰ for δ98Mo and between −1.74‰ and 0.26‰ for δ238U. Porewater gradients at the time of sampling are inconsistent with diffusion downwards across the sediment–seawater interface as a means of enrichment of the sediment-porewater system. Though these sampled conditions may represent only a snapshot, so that periodically more reducing conditions could lead to concentration gradients that do permit downward diffusion, the data are also readily explained by addition of Mo and U to the sediment-porewater system in particulate form, also under more reducing conditions than at the time of sampling. For example, sequestration of Mo and U to particulate matter as a result of the presence of intermittent sulfide, either in bottom water or in porewater right at the sediment–water interface, explains much of the geochemical and isotope data. The data thus suggest that the early diagenetic enrichment of Mo and U in sediments of upwelling margins is strongly governed by temporal redox fluctuations. Early diagenesis under these dynamic redox conditions on the Namibian upwelling margin are strongly reflected in Mo-U co-variation patterns, as well as anti-correlations between authigenic δ98Mo and δ238U in sediments. Overall, our new data demonstrate that early diagenetic processes on open-marine continental margins reproduce patterns previously observed for coupled Mo-U isotope systematics in restricted and semi-restricted basins, but via a different set of processes and with important implications for the use of such a coupled approach in the study of ancient marine anoxia.

Authigenic

Oxygen minimum zone

10.1016/j.gca.2021.06.024

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Citations (29)

Spatial variation of dissolved copper isotope systematics in the Changjiang (Yangtze) River: Response to weathering processes and anthropogenic impacts

Chemical Geology (2024)

A. Vargas Zhiwei He Guo Junjie Shouye Yang

Biogeochemical Cycle

10.1016/j.chemgeo.2024.121977

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Genesis of carbonate-hosted Zn-Pb deposits in the Late Indosinian thrust and fold systems: An example of the newly discovered giant Zhugongtang deposit, South China

Journal of Asian Earth Sciences (2021)

Wei Chen Zhilong Huang Lin Ye Yusi Hu M. Santosh

δ34S

Devonian

10.1016/j.jseaes.2021.104914

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Citations (17)

The Origin of Carbonate Components in Carbonate Hosted Pb-Zn Deposit in the Sichuan-Yunnan-Guizhou Pb-Zn Metallogenic Province and Southwest China: Take Lekai Pb-Zn Deposit as an Example

Minerals (2022)

Zhiwei He Bo Li Xinfu Wang Xiao Xianguo Xin Wan

The Lekai lead–zinc (Pb-Zn) deposit is located in the northwest of the Sichuan–Yunnan–Guizhou (SYG) Pb-Zn metallogenic province, southwest China. Even now, the source of the metallogenic fluid of Pb-Zn deposits in the SYG Pb-Zn metallogenic province has not been recognized. Based on traditional lithography, rare earth elements (REEs), and carbon–oxygen (C–O) isotopes, this work uses the magnesium (Mg) isotopes of hydrothermal carbonate to discuss the fluid source of the Lekai Pb-Zn deposit and discusses the fractionation mechaism of Mg isotopes during Pb-Zn mineralization. The REE distribution patterns of hydrothermal calcite/dolomite are similar to that of Devonian sedimentary carbonate rocks, which are all present steep right-dip type, indicating that sedimentary carbonate rocks may be serve as the main source units of ore-forming fluids. The C–O isotopic results of hydrothermal dolomite/calcite and the δ13CPDB–δ18 OSMOW diagram show that dolomite formation is closely related to the dissolution of marine carbonate rocks, and calcite may be affected to some extent by basement fluid. The Mg isotopic composition of dolomite/calcite ranges from −3.853‰ to −1.358‰, which is obviously lighter than that of chondrites, mantle, or seawater and close to that of sedimentary carbonate rock. It shows that the source of the Mg element in metallogenic fluid of Lekai Pb-Zn deposit may be sedimentary carbonate rock rather than mantle, chondrites, or seawater. In addition, the mineral phase controls the Mg isotope fractionation of dolomite/calcite in the Lekai Pb-Zn deposit. Based on the geological, mineralogical, and hydrothermal calcite/dolomite REE, C–O isotope, and Mg isotope values, this work holds that the mineralization of the Lekai Pb-Zn deposit is mainly caused by basin fluids, influenced by the basement fluids; the participation of basement fluids affects the scale and grade of the deposit.

Carbonate minerals

10.3390/min12121615

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Citations (3)