Geochemical characteristics and sedimentary environments of Devonian low metamorphic clastic sedimentary rocks in the southern margin of the Chinese Altai, North Xinjiang
文献类型：期刊论文
| 作者 | Long XiaoPing1; Yuan Chao1; Sun Min2; Xiao WenJiao3; Lin ShouFa4; Wang Yujing1; Cai KeDa2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2008-04-01 |
| 卷号 | 24期号:4页码:718-732 |
| 关键词 | geochemistry clastic sedimentary rocks Altai orogen north Xinjiang tectonic setting |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Devonian is a key period for the tectonic evolution of the Chinese Altai and several competitive models, e. g. active continental margins and passive continental margins, have been suggested for this region. These models were mainly based on studies of the Devonian volcanic rocks in the southern margin of the Chinese Altai, and geochemical research for the sedimentary rocks is still rare. In this paper, systematic geochemical study for the Devonian low-grade metamorphosed elastic rocks was conducted to constrain the tectonic background of this orogen. The major element data show that protoliths for the metaclastic rocks are dominated by argillaceous and arenaceous sedimentary rocks. Although differing in major element contents among rocks of various types, their low Chemical Index of Alteration (CIA < 75), Plagioclase Index of Alteration (mean PIA = 70) and Index of Compositional Variability (ICV <= 1.0) indicate relatively low maturity and weak chemical weathering for their source. The samples are moderately enriched in light REE (La-N/Yb-N = 2.88 similar to 9. 90) and show flat heavy REE with strong negative Eu anomalies ( Eu/Eu* = 0. 45 similar to 0. 89). Most samples have high La/Sc (1 similar to 3), La/Y (0.5 similar to 1), Ti/Zr (10 similar to 35) and low Sc/Cr (0.1 similar to 0. 3) ratios, which are similar to elastic rocks deposited in continental arc settings. In both La-Th-Sc and Th-Sc-Zr/10 discriminate diagrams, almost all of the elastic rocks plot in the continental arc field. These geochemical characteristics are different from those of sedimentary rocks deposited in oceanic island arcs or passive continental margins and suggest a sedimentary environment related to continental island arcs for the Devonian clatic rocks in the southern margin of the Chinese Altai. |
| WOS关键词 | SOUTHWESTERN UNITED-STATES ; PB ISOTOPIC EVIDENCE ; CRUSTAL EVOLUTION ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST ; VOLCANIC-ROCKS ; OROGENIC BELT ; PROVENANCE ; GROWTH ; MONGOLIA |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000256696700011 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/69646]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Long XiaoPing |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada |
| 推荐引用方式 GB/T 7714 | Long XiaoPing,Yuan Chao,Sun Min,et al. Geochemical characteristics and sedimentary environments of Devonian low metamorphic clastic sedimentary rocks in the southern margin of the Chinese Altai, North Xinjiang[J]. ACTA PETROLOGICA SINICA,2008,24(4):718-732. |
| APA | Long XiaoPing.,Yuan Chao.,Sun Min.,Xiao WenJiao.,Lin ShouFa.,...&Cai KeDa.(2008).Geochemical characteristics and sedimentary environments of Devonian low metamorphic clastic sedimentary rocks in the southern margin of the Chinese Altai, North Xinjiang.ACTA PETROLOGICA SINICA,24(4),718-732. |
| MLA | Long XiaoPing,et al."Geochemical characteristics and sedimentary environments of Devonian low metamorphic clastic sedimentary rocks in the southern margin of the Chinese Altai, North Xinjiang".ACTA PETROLOGICA SINICA 24.4(2008):718-732. |
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。