Integrated analyses constraining the provenance of sandstones, mudstones, and conglomerates, a case study: the Laojunshan conglomerate, Qilian orogen, northwest China
文献类型：期刊论文
| 作者 | Yan, Zhen; Xiao, Wenjiao; Wang, Zongqi; Li, Jilian |
| 刊名 | CANADIAN JOURNAL OF EARTH SCIENCES
 |
| 出版日期 | 2007-07-01 |
| 卷号 | 44期号:7页码:961-986 |
| ISSN号 | 0008-4077 |
| DOI | 10.1139/E07-010 |
| 文献子类 | Article |
| 英文摘要 | The Qilian orogenic belt in the northern Tibetan plateau connects the Altaids to the north with the Tethyan orogenic system to the south and occupies a key tectonic position in the evolution and assembly of Asia. The belt contains a wide range of subduction-accretion-related petrotectonic units. The Early-Middle Devonian Laojunshan conglomerate, deposited unconformably upon Cambrian-Silurian strata along the northern margin of the North Qilian terrane, contains a record of the late Paleozoic tectonism of the Qilian orogen. Its provenance and tectonic setting are critical in understanding not only the tectonic evolution of Tibetan plateau, but Paleozoic global reconstructions as well. The composition of elastic conglomerates and heavy mineral assemblages of sandstones suggests that coeval mafic, felsic, metamorphic, and sedimentary rocks were the main sources. The geochemistry of volcanic clasts and paleocurrent and paleogeographic data suggest derivation from subduction-accretion complexes in the North Qilian terrane. The geochemistry of siltstones and mudstones indicates that the Laojunshan conglomerate was derived from an arc and accumulated in an active continental margin. Geochemical data of granitoid clasts suggest that they were derived from Ordovician-Silurian subduction-related magmatic rocks. Mafic and ultramafic clasts, chromite, and magnetite decrease upwards in the stratigraphy whereas metamorphic, sedimentary and granitoid clasts, and garnet increase. These data imply that mafic rocks were the predominant source during initial deposition. Regional studies suggest that the North China plate subducted southwards and produced subduction-related arc magmatism along the southern margin of the North Qilian terrane during the Early-Middle Devonian. Therefore, we interpret the Laojunshan conglomerate as a fore-arc basin fill. |
| WOS关键词 | TRACE-ELEMENT CHARACTERISTICS ; PENNSYLVANIAN-PERMIAN AGE ; SEDIMENTARY-ROCKS ; NW CHINA ; GEOCHEMISTRY ; GEOCHRONOLOGY ; EVOLUTION ; BASINS ; SHALES ; DISCRIMINATION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000249709000006 |
| 出版者 | CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67960]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Yan, Zhen |
| 作者单位 | 1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yan, Zhen,Xiao, Wenjiao,Wang, Zongqi,et al. Integrated analyses constraining the provenance of sandstones, mudstones, and conglomerates, a case study: the Laojunshan conglomerate, Qilian orogen, northwest China[J]. CANADIAN JOURNAL OF EARTH SCIENCES,2007,44(7):961-986. |
| APA | Yan, Zhen,Xiao, Wenjiao,Wang, Zongqi,&Li, Jilian.(2007).Integrated analyses constraining the provenance of sandstones, mudstones, and conglomerates, a case study: the Laojunshan conglomerate, Qilian orogen, northwest China.CANADIAN JOURNAL OF EARTH SCIENCES,44(7),961-986. |
| MLA | Yan, Zhen,et al."Integrated analyses constraining the provenance of sandstones, mudstones, and conglomerates, a case study: the Laojunshan conglomerate, Qilian orogen, northwest China".CANADIAN JOURNAL OF EARTH SCIENCES 44.7(2007):961-986. |
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。