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Copper Isotopic Fractionation During Seafloor Alteration: Insights From Altered Basalts in the Mariana and Yap Trenches

文献类型：期刊论文

作者Guo, Zixiao3,4,5; Tian, Heng-Ci1; Liu, Yadong4,5; Peng, Xiaotong3; Qin, Guohong4,5; Lv, Yiwen2
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2022
卷号127期号:1页码:8
ISSN号2169-9313
DOI10.1029/2021JB023597
英文摘要To further investigate copper (Cu) isotopic fractionation during seawater-oceanic crust interactions, 13 subsamples across a basalt altering section and 12 bulk-rock basalts from the southern Mariana and Yap trenches, western Pacific Ocean, were studied. We find that the delta Cu-65 values of the basalt section roughly increase from mid-ocean ridge basalt-like values (0.04% - 0.10%) in the core to higher values (up to 0.20%) near the core-rim interface, and then lower values (down to -0.17%) at the rims. Isotopically light rims reflect the initial dissolution of Cu-bearing sulfides releasing isotopically heavy Cu into ambient seawater, consistent with both lower Cu and sulfide contents in the altered rims. The elevated delta Cu-65 values reveal that sulfide dissolution induced a concentration-driven diffusion from the core to rims, controlling the rim-core-rim Cu content and isotopic variations on centimeter scale. By contrast, the delta Cu-65 values of bulk-rock basalts show a wide range (0.02% - 0.56%) with most samples enriched in heavy isotopes, and negatively correlate with Cu concentrations, indicating preferential adsorption of isotopically heavy Cu from seawater. We propose that chemical diffusion occurred prior to any adsorption processes, suggesting that a three-stage process involving sulfide dissolution, chemical diffusion and adsorption controls Cu isotopic fractionation during seafloor basalt alteration. Plain Language Summary Seawater-oceanic crust interactions have been known to affect the Cu-65/Cu-63 isotopic ratios of both oceans and the oceanic crust, thus playing a key role on global copper (Cu) cycling. However, the behavior of Cu during seawater-oceanic crust interactions remains poorly understood. We, for the first time, conduct a combined study on "in situ" delta Cu-65 values of 13 subsamples across a basalt altering section and whole-rock delta Cu-65 values of 12 bulk basalts from the southern Mariana and Yap trenches. The rims in the basalt section have Cu isotopic compositions lighter than mid-ocean ridge basalts, reflecting sulfide oxidation during seafloor alteration. The rim-core-rim Cu content and isotopic variation can be explained by a concentration-driven diffusion from the core to rims after sulfide oxidation. Furthermore, the whole-rock delta Cu-65 values with a wide range (0.02% - 0.56%) indicate that chemical diffusion may be followed by an absorption during seafloor alteration. The multistage Cu isotopic fractionation proposed here therefore is a step toward a more comprehensive picture of seawater-oceanic crust interactions.
WOS关键词IGNEOUS ROCK STANDARDS ; HIGH-PRECISION COPPER ; HYDROTHERMAL VENTS ; OCEANIC-CRUST ; CU ; SYSTEMATICS ; ARC
资助项目Natural Science Foundation of Hebei Province[D2020205007] ; Science and Technology Project of Hebei Education Department[QN2020176] ; Science Foundation of Hebei Normal University[L2020B24]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000751217400035
出版者AMER GEOPHYSICAL UNION
资助机构Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science and Technology Project of Hebei Education Department ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University ; Science Foundation of Hebei Normal University
源URL[http://ir.iggcas.ac.cn/handle/132A11/104895]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Tian, Heng-Ci; Peng, Xiaotong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
4.Hebei Normal Univ, Hebei Key Lab Environm Change & Ecol Construct, Shijiazhuang, Hebei, Peoples R China
5.Hebei Normal Univ, Sch Geog Sci, Shijiazhuang, Hebei, Peoples R China
推荐引用方式
GB/T 7714		 Guo, Zixiao,Tian, Heng-Ci,Liu, Yadong,et al. Copper Isotopic Fractionation During Seafloor Alteration: Insights From Altered Basalts in the Mariana and Yap Trenches[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(1):8.
APA Guo, Zixiao,Tian, Heng-Ci,Liu, Yadong,Peng, Xiaotong,Qin, Guohong,&Lv, Yiwen.(2022).Copper Isotopic Fractionation During Seafloor Alteration: Insights From Altered Basalts in the Mariana and Yap Trenches.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(1),8.
MLA Guo, Zixiao,et al."Copper Isotopic Fractionation During Seafloor Alteration: Insights From Altered Basalts in the Mariana and Yap Trenches".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.1(2022):8.

入库方式： OAI收割

来源：地质与地球物理研究所

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