Depositional age and geochemistry of the 2.44-2.32 Ga Granular Iron Formation in the Songshan Group, North China Craton: Tracing the effects of atmospheric oxygenation on continental weathering and seawater environment
文献类型：期刊论文
| 作者 | Lan, Caiyun1; Long, Xiaoping1; Zhai, Mingguo2; Wang, Jingyu1 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2021-06-01 |
| 卷号 | 357页码:15 |
| ISSN号 | 0301-9268 |
| 关键词 | Iron formation Oxygenation Global great oxidation event C-O isotopes North China Craton |
| DOI | 10.1016/j.precamres.2021.106142 |
| 英文摘要 | The responses of oceanic chemistry and redox state to the oxygenation of atmosphere at the period (2.45-2.10 Ga) of the global Great Oxidation Event remain poorly constrained due to the lacking of coeval marine chemical precipitates, e.g., Iron Formation. Here, we report a Granular Iron Formation (GIF) in the Songshan Group of the North China Craton and its depositional age was constrained at 2.44-2.32 Ga at the first time. In the GIF, hematite is the primary iron oxide and its occurrence indicates that the shallow seawater at 2.44-2.32 Ga was oxygenated, which is in agreement with the positive delta C-13 excursion of the coeval carbonates up and below the Songshan GIF. No significant correlations between redox-sensitive trace elements (Cr, V, Mo and U) and Al2O3 contents exclude terrigenous clastic origin, suggesting that these elements are enriched during the deposition and have been adsorbed by the Fe-rich chemical precipitates. The high Cr (up to 2000 ppm) and B (up to 300 ppm) contents of the GIF and the authigenic hematites further indicate an increase of chemical weathering and subsequent input into the seawater. Combined with high V (up to 1500 ppm) and P (up to 7000 ppm) contents in the GIF, it can be inferred that continental oxidative weathering was intensive during 2.44-2.32 Ga. The enrichments of Cr contents and Cr/Ti ratios of the Songshan GIF and its authigenic hematites suggest that Cr was transported to the oceans as soluble Cr (VI) species by rivers because of the oxidative Cr(III) in Cr-rich accessory minerals in soil or crust. The enrichment processes of Cr and V in the hematites are likely to be that soluble Cr (VI) and V (V) supplying by the downwelling surface waters transform into Cr (III) and V (III) in the suboxic-anoxic bottom waters and then removed from seawater via authigenic burial of hematite because trivalent cations can substitute in the hematite structure. Based on above, we therefore suggest a new depositional scenario for the Songshan GIF, in which precipitation occurred due to upwelling of deep, anoxic, reduced Cr-V-rich ferruginous waters into an oxygenated, high productivity shallow-water setting. |
| WOS关键词 | RARE-EARTH-ELEMENTS ; LAKE-SUPERIOR REGION ; ISOTOPE GEOCHEMISTRY ; SEDIMENTARY CARBONATES ; DETRITAL ZIRCONS ; HAMERSLEY GROUP ; OCEAN REDOX ; EVOLUTION ; OXIDATION ; RISE |
| 资助项目 | National Natural Science Foundation of China[41890831] ; National Natural Science Foundation of China[41972199] ; China Postdoctoral Science Foundation[2019 M650272] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000652097000012 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101245]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Long, Xiaoping |
| 作者单位 | 1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lan, Caiyun,Long, Xiaoping,Zhai, Mingguo,et al. Depositional age and geochemistry of the 2.44-2.32 Ga Granular Iron Formation in the Songshan Group, North China Craton: Tracing the effects of atmospheric oxygenation on continental weathering and seawater environment[J]. PRECAMBRIAN RESEARCH,2021,357:15. |
| APA | Lan, Caiyun,Long, Xiaoping,Zhai, Mingguo,&Wang, Jingyu.(2021).Depositional age and geochemistry of the 2.44-2.32 Ga Granular Iron Formation in the Songshan Group, North China Craton: Tracing the effects of atmospheric oxygenation on continental weathering and seawater environment.PRECAMBRIAN RESEARCH,357,15. |
| MLA | Lan, Caiyun,et al."Depositional age and geochemistry of the 2.44-2.32 Ga Granular Iron Formation in the Songshan Group, North China Craton: Tracing the effects of atmospheric oxygenation on continental weathering and seawater environment".PRECAMBRIAN RESEARCH 357(2021):15. |
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。