Ferruginous seawater facilitates the transformation of glauconite to chamosite: An example from the Mesoproterozoic Xiamaling Formation of North China
文献类型：期刊论文
| 作者 | Tang, Dongjie1,2; Shi, Xiaoying1,3; Jiang, Ganqing4; Zhou, Xiqiang5; Shi, Qing1,2 |
| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2017-11-01 |
| 卷号 | 102期号:11页码:2317-2332 |
| 关键词 | Glauconite Berthierine Chamosite Seawater Redox Conditions Mesoproterozoic Xiamaling Formation |
| ISSN号 | 0003-004X |
| DOI | 10.2138/am-2017-6136 |
| 文献子类 | Article |
| 英文摘要 | Berthierine and chamosite are iron-rich clay minerals that share similar chemical compositions. Berthierine forms at low temperature (25-45 degrees C) during early diagenesis and may transfer to chamosite at temperatures of >= 70 degrees C. Because the formation of berthierine and chamosite requires significant amount of Fe2+ supply, their presence in marine sediments is often used as a mineral proxy for ferruginous conditions in porewater. Recent studies reveal that the Precambrian oceans were characterized by pervasive ferruginous water-column conditions that may favor the formation of iron-rich clay minerals like berthierine and chamosite. To evaluate if ferruginous water-column conditions in the Precambrian ocean played a role on iron-rich clay mineral formation, we conducted an integrated petrographic, mineralogical, and geochemical study on the chamosite- and glauconite-bearing strata of the Mesoproterozoic Xiamaling Formation (similar to 1.40-1.35 Ga) in North China. Petrographic, XRD, SEM, and EDS analyses show that the chamosites of the Xiamaling Formation was transferred from glauconite, with berthierine as an intermediate mineral phase during early diagenesis. Geochemical analyses indicate that a complete transformation from glauconite-dominated to chamosite-dominated end-members (samples) requires an addition of a large amount of Fe (16.9 wt%), Mg (2.4 wt%), and a small amount of Al (1.4 wt%), but a simultaneous release of Si (11.8 wt%) and K (6.0 wt%). Considering that the glauconite-and chamosite-bearing strata are devoid of iron-rich detrital minerals (e.g., biotite and iron oxides) and lack evidence of hydrothermal alteration, the required Fe2+ for glauconite-berthierine-chamosite transformation was most likely from Fe2+-rich (ferruginous) seawater, which may have promoted glauconite-berthierine transformation at the very early diagenetic stage when Fe2+ exchange between porewater and seawater was still available. This interpretation is consistent with the high Fe-HR/Fe-T (but low Fe-py/Fe-HR), Fe/Al, and V/Al ratios from the hosting strata that support ferruginous depositional environments. Because most Precambrian strata have passed the oil window temperature (>50-150 degrees C), the preservation of berthierine would be rare and chamosite should be the representative iron-rich clay mineral. Thus, the abundance of chamosite in fine-grained, marine siliciclastic sediments may be used as a mineral indicator of ferruginous water-column conditions. |
| WOS关键词 | COLUMBIA SUPERCONTINENT ; SERPENTINE-CHLORITE ; TIELING FORMATION ; OXYGEN LEVELS ; CRATON ; BERTHIERINE ; IRON ; BREAKUP ; SEDIMENTS ; CONSTRAINTS |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000414669300016 |
| 出版者 | MINERALOGICAL SOC AMER |
| 资助机构 | National Natural Science Foundation of China(41672336 ; 41402024) ; National Natural Science Foundation of China(41672336 ; 41402024) ; National Natural Science Foundation of China(41672336 ; 41402024) ; National Natural Science Foundation of China(41672336 ; 41402024) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62427]  |
| 专题 | 地质与地球物理研究所_中国科学院油气资源研究重点实验室 |
| 通讯作者 | Shi, Xiaoying |
| 作者单位 | 1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China 2.China Univ Geosci, Inst Earth Sci, Beijing 100083, Peoples R China 3.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 4.Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA 5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Dongjie,Shi, Xiaoying,Jiang, Ganqing,et al. Ferruginous seawater facilitates the transformation of glauconite to chamosite: An example from the Mesoproterozoic Xiamaling Formation of North China[J]. AMERICAN MINERALOGIST,2017,102(11):2317-2332. |
| APA | Tang, Dongjie,Shi, Xiaoying,Jiang, Ganqing,Zhou, Xiqiang,&Shi, Qing.(2017).Ferruginous seawater facilitates the transformation of glauconite to chamosite: An example from the Mesoproterozoic Xiamaling Formation of North China.AMERICAN MINERALOGIST,102(11),2317-2332. |
| MLA | Tang, Dongjie,et al."Ferruginous seawater facilitates the transformation of glauconite to chamosite: An example from the Mesoproterozoic Xiamaling Formation of North China".AMERICAN MINERALOGIST 102.11(2017):2317-2332. |
入库方式： OAI收割
来源：地质与地球物理研究所
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