Decoupled sources of the 2.3-2.2 Ga Yuanjiacun banded iron formation: Implications for the Nd cycle in Earth's early oceans
文献类型：期刊论文
| 作者 | Wang, Changle1,2; Konhauser, Kurt O.3; Zhang, Lianchang1; Zhai, Mingguo1; Li, Wenjun1 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2016-07-01 |
| 卷号 | 280页码:1-13 |
| 关键词 | Yuanjiacun Archean and Paleoproterozoic Seawater Neodymium BIF |
| DOI | 10.1016/j.precamres.2016.04.016 |
| 文献子类 | Article |
| 英文摘要 | The recognized worldwide gap in BIF deposition between 2.4 and 2.0 billion years ago has long been considered as an obstacle to fully determining the geochemical composition of seawater at that time. However, the recently dated 2.3-2.2 Ga Yuanjiacun banded iron formation (BIF) in the North China Craton (NCC) offers a possibility to redress these uncertainties. Shale-normalized rare earth element yttrium (REE + Y) patterns of the BIF and interlayered meta-chert samples show features characteristic of other Archean and Paleoproterozoic BIFs, with HREE enrichment relative to LREE, positive La and Eu anomalies, and superchondritic Y/Ho ratios comparable to modern seawater. Very low Al2O3 (<0.5 wt %) and high field strength elements (HFSE) concentrations (<10 ppm) indicate an essentially detritus free depositional setting, while positive Eu anomalies are attributed to an imprint of high-temperature hydrothermal fluids. Sm-Nd isotopic features further point to two periodically interacting water masses controlling the deposition of the BIF. The first is seafloor-vented hydrothermal fluids (epsilon(Nd)(t)similar to +3.5) derived from interaction with a depleted mantle source and associated with high Fe fluxes. The second is ambient surface seawater (epsilon(Nd)(t)similar to-2.4), which obtained its signature through weathering of the nearby landmasses and associated with high Si fluxes. Our findings suggest that the REE budget of the oceans prior to 2.3 Ga was generally dominated by hydrothermal circulation of seawater through depleted mantle-derived source rocks. However, where evolved local continental crust and/or an enriched mantle source were present, this positive mantle Nd signal became discernible in the BIFs. By comparing the Nd isotopic features of similar aged BIFs and marine carbonates, it is concluded that similar to modern oceans, the early Precambrian ocean was not well-mixed with respect to its Nd isotopic composition. (C) 2016 Elsevier B.V. All rights reserved. |
| WOS关键词 | NORTH CHINA CRATON ; GREAT OXIDATION EVENT ; SILICON ISOTOPIC COMPOSITIONS ; LITHOSPHERIC MANTLE BENEATH ; SUPRACRUSTAL BELT QUEBEC ; ISUA GREENSTONE-BELT ; EASTERN INDIAN-OCEAN ; WEST GREENLAND ; NEODYMIUM ISOTOPES ; U-PB |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000378666700001 |
| 资助机构 | Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China(41372100) ; National Natural Science Foundation of China(41372100) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; Major State Basic Research Programme of the People's Republic of China(2012CB416601) ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China(41372100) ; National Natural Science Foundation of China(41372100) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/53400]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB, Canada |
| 推荐引用方式 GB/T 7714 | Wang, Changle,Konhauser, Kurt O.,Zhang, Lianchang,et al. Decoupled sources of the 2.3-2.2 Ga Yuanjiacun banded iron formation: Implications for the Nd cycle in Earth's early oceans[J]. PRECAMBRIAN RESEARCH,2016,280:1-13. |
| APA | Wang, Changle,Konhauser, Kurt O.,Zhang, Lianchang,Zhai, Mingguo,&Li, Wenjun.(2016).Decoupled sources of the 2.3-2.2 Ga Yuanjiacun banded iron formation: Implications for the Nd cycle in Earth's early oceans.PRECAMBRIAN RESEARCH,280,1-13. |
| MLA | Wang, Changle,et al."Decoupled sources of the 2.3-2.2 Ga Yuanjiacun banded iron formation: Implications for the Nd cycle in Earth's early oceans".PRECAMBRIAN RESEARCH 280(2016):1-13. |
入库方式： OAI收割
来源：地质与地球物理研究所
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