Incipient reddening of Ordovician carbonates: The origin and geochemistry of yellow and pink colouration in limestones
文献类型：期刊论文
| 作者 | Babek, Ondrej4; Kumpan, Tomas3; Li, Wenjie2; Hola, Marketa1; Simicek, Daniel4; Kapusta, Jaroslav4 |
| 刊名 | SEDIMENTARY GEOLOGY
 |
| 出版日期 | 2022-10-01 |
| 卷号 | 440页码:16 |
| ISSN号 | 0037-0738 |
| 关键词 | Ordovician Microbial activity Early diagenesis Redox cycling Geochemistry Marine red beds |
| DOI | 10.1016/j.sedgeo.2022.106262 |
| 通讯作者 | Babek, Ondrej(ondrej.babek@upol.cz) |
| 英文摘要 | Red colouring in marine red beds (MRB) is commonly attributed to deposition and early diagenesis under specific redox conditions. Therefore, the MRB can be considered time-specific facies. However, since red colouring is a sub-jective criterion, it is difficult to establish a colour limit for the MRB in the scale from grey to yellow, orange, pink to red. Using spectral reflectance, carbonate petrology, bulk-rock and in-situ geochemistry data from three sections of Ordovician orthoceratite carbonates of South China, we addressed the question whether the incipient reddening in the pink carbonates was associated with similar redox changes and palaeoceanographic conditions like in the MRB. The yellowish grey to greyish orange pink (Munsell Rock Colour Chart) carbonates with low concentrations of he-matite (< 0.01 %) are transitional from goethite-bearing grey to hematite-enriched true MRB. The red-coloured skel-etal interiors, microstromatolites, nodules and filamentous microborings suggest an extensive microbial activity which was accompanied by precipitation of authigenic aluminosilicates (clays). We hypothesize that the microbial clay precipitation is an important intermediate step in Fe transformation from its primary sources to hematite in the MRB. The carbonate deposition was followed by early diagenetic, shallow-subsurface REE fractionation, and Fe\\Mn (+Mo, U and V) redox cycling along microbially controlled redox microgradients. The geochemical redox signature of the pink carbonates is very similar to the MRBs of Devonian and Ordovician age. They were deposited under sim-ilar palaeoenvironmental conditions on a deeper shelf inhabited by skeletal heterotrophs, with reduced rates of or-ganic matter burial and slow sedimentation rates. The sedimentation of the pink carbonates and MRBs seem to randomly coincide with the coeval global sea-level changes and delta 13Ccarb fluctuations suggesting that the local controls of sediment colour override the global ones.(c) 2022 Elsevier B.V. All rights reserved. |
| WOS关键词 | RARE-EARTH-ELEMENTS ; ROSSO-AMMONITICO-VERONESE ; OCEANIC RED BEDS ; SOUTH CHINA ; YANGTZE REGION ; TRACE-METALS ; ISOTOPE STRATIGRAPHY ; PELAGIC LIMESTONES ; SEDIMENTARY-ROCKS ; CERIUM ANOMALIES |
| 资助项目 | Czech Science Foundation (GACR)[19-17435S] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000872548200001 |
| 资助机构 | Czech Science Foundation (GACR) |
| 源URL | [http://ir.nigpas.ac.cn/handle/332004/41369]  |
| 专题 | 中国科学院南京地质古生物研究所 |
| 通讯作者 | Babek, Ondrej |
| 作者单位 | 1.Masaryk Univ, Dept Chem, Kamenice 753-5, Brno 62500, Czech Republic 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 3.Masaryk Univ, Dept Geol Sci, Kotlarska 2, Brno 61137, Czech Republic 4.Palacky Univ, Dept Geol, 17 Listopadu 12, Olomouc 77146, Czech Republic |
| 推荐引用方式 GB/T 7714 | Babek, Ondrej,Kumpan, Tomas,Li, Wenjie,et al. Incipient reddening of Ordovician carbonates: The origin and geochemistry of yellow and pink colouration in limestones[J]. SEDIMENTARY GEOLOGY,2022,440:16. |
| APA | Babek, Ondrej,Kumpan, Tomas,Li, Wenjie,Hola, Marketa,Simicek, Daniel,&Kapusta, Jaroslav.(2022).Incipient reddening of Ordovician carbonates: The origin and geochemistry of yellow and pink colouration in limestones.SEDIMENTARY GEOLOGY,440,16. |
| MLA | Babek, Ondrej,et al."Incipient reddening of Ordovician carbonates: The origin and geochemistry of yellow and pink colouration in limestones".SEDIMENTARY GEOLOGY 440(2022):16. |
入库方式： OAI收割
来源：南京地质古生物研究所
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