Hydrothermal venting and basin evolution (Devonian, South China): Constraints from rare earth element geochemistry of chert
文献类型：期刊论文
| 作者 | Chen, DZ; Qing, HR; Yan, X; Li, H |
| 刊名 | SEDIMENTARY GEOLOGY
 |
| 出版日期 | 2006-01-15 |
| 卷号 | 183期号:3-4页码:203-216 |
| 关键词 | REE patterns chert hydrothermal activity basin evolution open marine basin Late Devonian South China |
| ISSN号 | 0037-0738 |
| DOI | 10.1016/j.sedgeo.2005.09.020 |
| 文献子类 | Article |
| 英文摘要 | This paper presents rare earth element (REE) geochemistry of siliceous deposits from which hydrothermal activity and basin evolution are elucidated, in the Late Devonian, in the Yangshuo basin, South China, where siliceous deposits widely occurred as nodular chert in the deep-water limestones and bedded chert interbeded with tuffaceous chert in the early Late Devonian, Both nodular and bedded cherts are characterized by very low La abundances (avg. 2.07 and 2.49 ppm, respectively), intermediate negative Cc anomalies (Ce/Ce*: avg. 0.69 and 0.61), slight to intermediate positive Eu anomalies (Eu/Eu*: avg. 1.33 and 1.57), and low to intermediate shale-normalized La-n/Yb-n values (avg. 0.86 and 0.52) and intermediate La-n/Ce-n values (avg. 1.61 and 1.72). These suggest both nodular and bedded cherts formed in the open marine basin of South China, rather than in the intracontinental rift basin as previously assumed, with involvement both with seawaters as indicated by intermediate negative Cc anomalies and generally LREE-depleted patterns, and hydrothermal vent fluids as indicated by convex, less LREE-depleted patterns with apparent positive Eu anomalies. In comparison with nodular and bedded chert, the tuffaceous chert has the highest La abundances (avg. 17.11 ppm), similar ranges of Ce anomalies (avg. 0.63) and La-n/Ce-n values (avg. 1.77), but lower La-n/Yb-n values (avg. 0.48) and no apparent positive Eu anomalies (avg. 0.97). This suggests that the tuffaceous fallouts were also significantly modified by the hydrothermal fluid and seawater. Rapid spatial variations of Eu/Eu* values and degree of LREE-depletions in the studied basin are recognized, characterizing a spatially differential hydothermal activity that is not well discriminated by major element features. Such a difference in hydrothermal activity is interpreted as having been related to the intensity and depth of syndepositional tectonic activity, reconciling the structural pattern unraveled by stratigraphic packages. (c) 2005 Elsevier B.V. All rights reserved. |
| WOS关键词 | EAST PACIFIC RISE ; MARINE-SEDIMENTS ; OCEAN ; SEA ; ENVIRONMENT ; INDICATORS ; OPHIOLITE ; MONTEREY ; SCOTLAND ; SEAWATER |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000234629000003 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66872]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Chen, DZ |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Regina, Dept Geol, Regina, SK S4S 0A2, Canada |
| 推荐引用方式 GB/T 7714 | Chen, DZ,Qing, HR,Yan, X,et al. Hydrothermal venting and basin evolution (Devonian, South China): Constraints from rare earth element geochemistry of chert[J]. SEDIMENTARY GEOLOGY,2006,183(3-4):203-216. |
| APA | Chen, DZ,Qing, HR,Yan, X,&Li, H.(2006).Hydrothermal venting and basin evolution (Devonian, South China): Constraints from rare earth element geochemistry of chert.SEDIMENTARY GEOLOGY,183(3-4),203-216. |
| MLA | Chen, DZ,et al."Hydrothermal venting and basin evolution (Devonian, South China): Constraints from rare earth element geochemistry of chert".SEDIMENTARY GEOLOGY 183.3-4(2006):203-216. |
入库方式： OAI收割
来源：地质与地球物理研究所
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