Dwindling vanadium in seawater during the early Cambrian, South China | |
Tao Han; Haifeng Fan; Hanjie Wen | |
2018 | |
发表期刊 | Chemical Geology |
卷号 | 492页码:20-29 |
摘要 | Elemental vanadium (V), an essentially redox-sensitive metal in seawater, has had a significant impact on the understanding of the evolution of the atmosphere-ocean system throughout the history of the Earth. In fact, the geochemical cycle of V in early Cambrian seawater may have had an influence on the Chengjiang Biota in South China; however, it has not yet been well established. Given the authigenic vanadium accumulation is sensitive to the redox conditions of seawater, here, to constrain the geochemical cycle of V in seawater during the early Cambrian, the Mo, U and total organic carbon (TOC) distributions with high-resolution samples from both the outer shelf and slope facies (e.g., the Duoding and Longbizui sections), are applied to evaluate the redox conditions of ambient seawater. The Mo-U relationships indicate that the redox conditions of the mid-depth seawater evolved in a systematic way in South China, transitioning from an Fe-Mn reduction zone to anoxic/intermittently euxinic states and then to oxic conditions during the early Cambrian. As a consequence, the authigenic V enrichment, constrained by the marine redox conditions, was mainly controlled by the Fe-Mn particulate shuttle and the reduction and adsorption of organic matter in anoxic/euxinic conditions. However, the decoupling among V, Mo, U and TOC under anoxic/euxinic conditions suggests a dwindling vanadium concentration in the early Cambrian seawater of South China. The scavenging efficiency of V from seawater is much higher than those of Mo and U under anoxic/euxinic conditions. Ultimately, these trace elements (e.g., Mo, U, and especially V) in seawater could effectively be regulated and adjusted to a reasonable level under the widespread anoxic/euxinic conditions. The drawdown of trace elements in seawater might provide an earlystage preparation of the marine environment for the subsequent Chengjiang Biota. |
关键词 | Vanadium redox-sensitive Elements seawater Chemistry redox Conditions early Cambrian |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/8770 |
专题 | 矿床地球化学国家重点实验室 |
作者单位 | State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China |
推荐引用方式 GB/T 7714 | Tao Han,Haifeng Fan,Hanjie Wen. Dwindling vanadium in seawater during the early Cambrian, South China[J]. Chemical Geology,2018,492:20-29. |
APA | Tao Han,Haifeng Fan,&Hanjie Wen.(2018).Dwindling vanadium in seawater during the early Cambrian, South China.Chemical Geology,492,20-29. |
MLA | Tao Han,et al."Dwindling vanadium in seawater during the early Cambrian, South China".Chemical Geology 492(2018):20-29. |
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