Composition and genesis of ferromanganese deposits from the northern South China Sea
文献类型：期刊论文
| 作者 | Zhong, Y; Chen, Z; Gonzalez, FJ; Hein, JR; Zheng, XF; Li, G; Luo, Y; Mo, AB; Tian, YH; Wang, SH |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2017 |
| 卷号 | 138页码:110-128 |
| 关键词 | Fe-mn Deposits Genetic Model Rare Earth Elements Hydrogenetic-diagenetic Growth Hydrocarbon Seeps Northern South China Sea |
| 英文摘要 | Marine ferromanganese (Fe-Mn) nodules and crusts are archives of past environmental conditions and potential mineral resources. Over the last 30 years, many have been discovered in the northern South China Sea (SCS). To determine the origin of the Fe-Mn deposits, a comprehensive laboratory analysis of physical properties, mineralogy and geochemistry was conducted on newly collected Fe-Mn nodule/crust samples. The results revealed that there are three types of Fe-Mn deposits: (1) Fe-rich nodules containing essentially goethite occur on the northeastern slope of the SCS, with high Fe, low Mn (Mn/Fe = 0.03) and low trace metals and rare earth elements concentrations; (2) Smooth Fe-Mn nodules and crusts composed of asbolane, todorokite and CFA occur along the northwestern marginal of the SCS that have similar Fe and Mn contents (Mn/Fe = 1.21), moderate trace metal enrichments, and a positive Ce anomaly; (3) Fe-Mn nodules and crusts composed of asbolane, todorokite and birnessite that occur in the central basin of the SCS have higher Mn and lower Fe contents (Mn/Fe = 1.45). This depositional pattern was associated with major changes in oceanographic conditions and tectonic regimes. The northeastern slope deposits occur in a contourite depositional system, are strongly enriched in Fe relative to Mn (average 38.7% and 0.96%, respectively), formed from the combination of hydrogenetic and diagenetic processes. We propose a new genetic model for Fe-Mn nodules, which formed through the oxidation of pyrite and pyrite-barite concretions that formed by rapid early diagenetic growth (average 3320 mm/Myr) on continental margins above the carbonate compensation depth, and dominated by hydrocarbon seep structures and strong erosive action of bottom currents along the northeastern slope. In contrast, the introduction of vigorous deep-water flow from the North Pacific promoted the slow growth (4-7 mm/Myr) of hydrogenetic Fe-Mn nodules and crusts along the northwestern margin. Finally, hydrogenetic growth of Fe-Mn nodules and crusts in the central basin may have been enhanced by volcanic processes. Our data provide new insights into the genesis and province characteristics of the Fe-Mn nodules and crusts of the northern SCS. (C) 2017 Elsevier Ltd. All rights reserved. |
| 资助项目 | MSG |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/16492]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 通讯作者 | zhongyi@scsio.ac.cn; chzhsouth@scsio.ac.cn; fj.gonzalez@igme.es; jhein@usgs.gov; zxf@scsio.ac.cn; gangli@scsio.ac.cn; hpu2011luo@163.com; abmo@scsio.ac.cn; tyh@scsio.ac.cn; wshds@scsio.ac.cn |
| 推荐引用方式 GB/T 7714 | Zhong, Y,Chen, Z,Gonzalez, FJ,et al. Composition and genesis of ferromanganese deposits from the northern South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,138:110-128. |
| APA | Zhong, Y.,Chen, Z.,Gonzalez, FJ.,Hein, JR.,Zheng, XF.,...&wshds@scsio.ac.cn.(2017).Composition and genesis of ferromanganese deposits from the northern South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,138,110-128. |
| MLA | Zhong, Y,et al."Composition and genesis of ferromanganese deposits from the northern South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 138(2017):110-128. |
入库方式： OAI收割
来源：南海海洋研究所
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。