Geochemistry, U-Pb zircon geochronology and Sm-Nd isotopes of the Xincai banded iron formation in the southern margin of the North China Craton: Implications on Neoarchean seawater compositions and solute sources
文献类型：期刊论文
| 作者 | Lan, Caiyun1; Yang, Alexandra Yang2; Wang, Changle3; Zhao, Taiping1 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2019-06-15 |
| 卷号 | 326页码:240-257 |
| 关键词 | North China Craton BIF Xincai Trace elements Neodymium isotope |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2017.10.024 |
| 英文摘要 | Banded iron formations (BIFs) that are distal from submarine volcanic activity and generally lack direct relationships with volcanic rocks have been extensively used as proxies to infer the chemical composition of ancient seawater and trace the effects of continental weathering at the time of their deposition. Here, we discuss the major and trace elements and Sm-Nd isotopic geochemistry of the poorly-studied Xincai BIF, located west of the Superior-type Huoqiu BIF along a NW-SE trending supracrustal belt in the southern margin of the North China Craton, to understand the compositions and solute sources of seawater during the Xincai BIF precipitation. U-Pb zircon dating of granitic intrusive rock and biotite schist interlayer of the BIF constrains the depositional age of the Xincai BIF to 2.5-2.7 Ga for the first time, indicating that the Xincai BIF could be part of the Huoqiu BIF or consist of contemporaneous sediments formed in a similar tectonic-depositional environment. Shale normalized rare earth element and yttrium (REY) patterns of the bulk and individual band samples display features that are characteristic of other Archean BIFs with light REE depletion relative to heavy REE, positive La-SN, Gd-SN and Y-SN anomalies, indicative of pure chemical sedimentation. The marine origin of these samples is further supported by their super-chondritic Y/Ho ratios (average Y/Ho = 47). The very low Al, Ti and high field strength element contents of the Xincai BIF indicate an essentially detritus-free component. The bulk BIF samples show a narrow range of epsilon(Nd)(t) values from -1.5 to + 1.0, and most of the samples have negative epsilon(Nd)(t) values, - 0.3 on average, which is different from Archean BIFs with mantle-derived depleted Nd isotopes. Deviations toward negative epsilon(Nd)(t) values of the iron bands (-0.5 to -0.1) and the silica bands (- 4.7 to - 0.5) further indicate a continental Nd contribution. In addition, positive Eu-SN anomalies that were found in all of the bulk and individual band samples indicate that a high-T hydrothermal input also contributed to their REY signatures. It is considered that both high-T hydrothermal fluids and ambient seawater with solutes from erosion and weathering of a nearby landmass can provide their REY signatures. |
| WOS关键词 | RARE-EARTH-ELEMENTS ; ISUA GREENSTONE-BELT ; EAST PACIFIC RISE ; TRACE-ELEMENT ; TRANSVAAL SUPERGROUP ; HYDROTHERMAL FLUIDS ; SOUTHEASTERN MARGIN ; CRUSTAL EVOLUTION ; ARCHEAN BASEMENT ; HENAN PROVINCE |
| 资助项目 | National Natural Science Foundation of China[41573041] ; Special Mapping and Technology Application Demonstration Project of China[12120114035101] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000469157300014 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Mapping and Technology Application Demonstration Project of China ; Special Mapping and Technology Application Demonstration Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Mapping and Technology Application Demonstration Project of China ; Special Mapping and Technology Application Demonstration Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Mapping and Technology Application Demonstration Project of China ; Special Mapping and Technology Application Demonstration Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Mapping and Technology Application Demonstration Project of China ; Special Mapping and Technology Application Demonstration Project of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/92283]  |
| 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 |
| 通讯作者 | Zhao, Taiping |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Ocean & Marginal Sea Geolou, Guangzhou 510640, Guangdong, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lan, Caiyun,Yang, Alexandra Yang,Wang, Changle,et al. Geochemistry, U-Pb zircon geochronology and Sm-Nd isotopes of the Xincai banded iron formation in the southern margin of the North China Craton: Implications on Neoarchean seawater compositions and solute sources[J]. PRECAMBRIAN RESEARCH,2019,326:240-257. |
| APA | Lan, Caiyun,Yang, Alexandra Yang,Wang, Changle,&Zhao, Taiping.(2019).Geochemistry, U-Pb zircon geochronology and Sm-Nd isotopes of the Xincai banded iron formation in the southern margin of the North China Craton: Implications on Neoarchean seawater compositions and solute sources.PRECAMBRIAN RESEARCH,326,240-257. |
| MLA | Lan, Caiyun,et al."Geochemistry, U-Pb zircon geochronology and Sm-Nd isotopes of the Xincai banded iron formation in the southern margin of the North China Craton: Implications on Neoarchean seawater compositions and solute sources".PRECAMBRIAN RESEARCH 326(2019):240-257. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。