Geochemistry and sedimentary background of the Middle-Upper Permian cherts in the Xiang-Qian-Gui region
文献类型：期刊论文
| 作者 | Qiu Zhen1,2; Wang QingChen1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2010-12-01 |
| 卷号 | 26期号:12页码:3612-3628 |
| 关键词 | Chert The Middle-upper Permian Geochemistry Sedimentary Background Xiang-qian-gui Region |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Permian cherts occurred extensively in South China. However, their sedimentary backgrounds including their origins and depositinal environments remain controversial. Based on extensive field observations and lithofacies study of the cherts in the Xiang (Hunan) -Qian (Guizhou) -Gui (Guangxi) region, we analyzed and compared major and trace elements of 81 samples from the Middle-Upper Permian cherts outcropping at 14 localities in the Qiangui (Guizhou-Guangxi) basin and the Xianggui (Hunan-Guangxi) basin. Al2O3 contents, TiO2 contents, the ratios of Al2O3/(Al2O3 + Fe2O3), Sigma REE and the values of Ce/Ce* of the Middle Permian cherts are totally low, and show a same distribution tendency in the studied region: They were lower (0.09% similar to 0.37%, 0.00% similar to 0.01%, 0.22 similar to 0.47, 2.47 x 10(-6) similar to 14.59 x 10(-6), 0.23 similar to 0.69) in the Qiangui basin and higher (0.01% similar to 5.73%, 0.00% similar to 0.23%, 0.02 similar to 0.71, 7.07 x 10(-6) similar to 141.0 x 10(-6), 0.24 similar to 1.22) in the Xianggui basin. Al2O3 contents, TiO2 contents, the ratios of Al2O3/(Al2O3 + Fe2O3), Sigma REE and the values of Ce/Ce* of the Upper Permian cherts are higher than those of the Middle Permian, and they are different from localities, low in the middle area (0% similar to 1.11%, 0.00% similar to 0.15%, 0 similar to 0.42, 0.55 x 10(-6) similar to 36.59 x 10(-6), 0.27 similar to 0.83) and high in both eastern (3.78% similar to 21.37%, 0.16% similar to 0.91%, 0.73 similar to 0.83, 51.14 x 10(-6) similar to 245.4 x 10(-6), 0.99 similar to 1.10) and western (1.62% similar to 10.67%, 0.04% similar to 0.65%, 0.41 similar to 0.81, 23.10 x 10(-6) similar to 248.99 x 10(-6) and 0.46 similar to 1.39) areas. The weight percentage of non-detrital Fe in total Fe, W (Fe-authig), of the Middle Permian cherts are higher than 50% with a few exception. However, W(Fe-authig) of the Upper Permian cherts are lower than 50% in most samples except for the samples at the localities of Laibin, Liuzhou and Bama where W(Fe-authig) are higher than 50%. In the Middle Permian cherts, the values of (La/Ce)(N) are 1.61 similar to 5.04 in the Qiangui Basin and 0.82 similar to 1.94 in the Xianggui basin (2.63 similar to 4.90 in Laibin). However, (La/Ce)(N) of the most cherts in the Late Permian are 0.69 similar to 2.47 except for that in Laibin (2.42 similar to 4.50). The values of Eu/Eu* of the Middle and Upper Permian cherts both show no regional difference, with negative anomalies in most samples. A few positive Eu anomalies are found in Bama (1.17 in the Middle Permian) and Laibin and Liuzhou (1.04 similar to 1.22 in the Upper Permian). With plotting in diagrams of Fe-Al-Mn, (La/Ce)(N) vs. Al2O3/(Al2O3 + Fe2O3), Fe2O3/TiO2 vs. Al2O3/(Al2O3 + Fe2O3), the above data suggest that (1) The Middle Permian cherts are different in origin. Those in the Qiangui Basin are of hydrothermal origin and those in Xianggui basin are biogenic with some hydrothermal influence. Most of cherts from the Upper Permian are of biogenic origin, except those in Bama, Laibin and Liuzhou with a hydrothermal origin. |
| WOS关键词 | RARE-EARTH-ELEMENTS ; EAST PACIFIC RISE ; SOUTH CHINA ; DEPOSITIONAL-ENVIRONMENTS ; BEDDED CHERTS ; ORIGIN ; SHALE ; CONSTRAINTS ; FRANCISCAN ; INDICATORS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000286452000013 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/72869]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Qiu Zhen |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qiu Zhen,Wang QingChen. Geochemistry and sedimentary background of the Middle-Upper Permian cherts in the Xiang-Qian-Gui region[J]. ACTA PETROLOGICA SINICA,2010,26(12):3612-3628. |
| APA | Qiu Zhen,&Wang QingChen.(2010).Geochemistry and sedimentary background of the Middle-Upper Permian cherts in the Xiang-Qian-Gui region.ACTA PETROLOGICA SINICA,26(12),3612-3628. |
| MLA | Qiu Zhen,et al."Geochemistry and sedimentary background of the Middle-Upper Permian cherts in the Xiang-Qian-Gui region".ACTA PETROLOGICA SINICA 26.12(2010):3612-3628. |
入库方式： OAI收割
来源：地质与地球物理研究所
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