Identification of the similar to 810Ma Qianlishan mafic dyke swarm and its implication for geological evolution of the western North China Craton
文献类型：期刊论文
| 作者 | Peng Peng1,2; Wang XinPing3; Zhou XiaoTong1,2; Wang Chong1,2; Sun FengBo1,2; Su XiangDong1,2; Chen Liang4; Guo JingHui1,2; Zhai MingGuo1,2,4 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2018 |
| 卷号 | 34期号:4页码:1191-1203 |
| 关键词 | North China Craton Neoproterozoic Qianlishan mafic dyke swarm Helanshan mafic dyke swarm Alxa block Rift |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Two mafic dyke swarms are identified from the Qianli-Helan Mts, one dominated with N-E-trending dykes, namely the Qianlishan swarm, intruded the Paleoproterozoic basement but was unconformably covered by the Precambrian Huangqikou Fm., while another with mostly N-W-trending ones, namely the Helanshan swarm, intruded both the basement and the Huangqikou-Wangquankou Fms. but was covered by the Carboniferous strata. Baddeleyites liberated from one Qianlishan dyke give a SIMS Pb-207/Pb-206 age of 813 +/- 7Ma (MSWD = 0. 63, n = 6), representing the timing of emplacement. Zircons from one Helanshan dyke, however, give the youngest Pb-206/U-238 ages of similar to 370Ma, representing an age of or slightly older than its intrusion. The Qianlishan dykes are tholeiitic, with high TiO2 (2. 7% similar to 3. 7%) and Fe2O3T (13.4% similar to 17. 0%) contents; whereas the Helanshan dykes are (weak) alkaline basalt with low TiO2 (1. 0% similar to 1. 5%) and Fe2O3T (5. 5% similar to 12. 4%) contents. Both swarms show enriched light rare earth elements and large ion lithophile elements but depleted high field strength elements, which are more prominent for the Helanshan swarm than the Qianlishan (e.g., (La/Yb)(N) are 2. 0 similar to 5. 5 for the Helanshan but 1. 9 similar to 2. 4 for the Qianlishan dykes). These features indicate that the parental magmas were probably both from a metasomatized lithospheric mantle or/and they were contaminated by the crust. The unconformable relationship of the Huangqikou, Wangquankou and Zhengmuguan Fms. related to the Qianlishan dykes and their relationship with the Cambrian strata indicate that these strata deposited during 810 similar to 541Ma. The basement of the Qianli-Helan Mts region belongs to the western North China Craton. It borders the Alxa block to the west, whose relationship with the craton is in debating. Based on the similarity of basement and the coeval and chemically similar igneous associations in the two regions (e.g., the 830 similar to 810Ma Langshan Group bimodal volcanics and Jinchuan mafic-ultramafic intrusions in the Alxa block), it is preferred here that the Alxa block was also a part of the craton as the basement of the Qianli-Helan Mts region, and both regions experienced extension rifting event during the Middle Neoproterozoic. |
| WOS关键词 | EASTERN ALXA BLOCK ; U-PB GEOCHRONOLOGY ; NW CHINA ; PALEOPROTEROZOIC EVOLUTION ; KHONDALITE BELT ; MANTLE-PLUME ; TECTONIC IMPLICATIONS ; COMPLEX CONSTRAINS ; ZIRCON AGES ; HF ISOTOPES |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000431895400018 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/88289]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Peng Peng |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Shanxi Normal Univ, Sch Geog Sci, Linfen 041004, Peoples R China 4.Northwest Univ, Dept Geol, Xian 710069, Shaanxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Peng Peng,Wang XinPing,Zhou XiaoTong,et al. Identification of the similar to 810Ma Qianlishan mafic dyke swarm and its implication for geological evolution of the western North China Craton[J]. ACTA PETROLOGICA SINICA,2018,34(4):1191-1203. |
| APA | Peng Peng.,Wang XinPing.,Zhou XiaoTong.,Wang Chong.,Sun FengBo.,...&Zhai MingGuo.(2018).Identification of the similar to 810Ma Qianlishan mafic dyke swarm and its implication for geological evolution of the western North China Craton.ACTA PETROLOGICA SINICA,34(4),1191-1203. |
| MLA | Peng Peng,et al."Identification of the similar to 810Ma Qianlishan mafic dyke swarm and its implication for geological evolution of the western North China Craton".ACTA PETROLOGICA SINICA 34.4(2018):1191-1203. |
入库方式： OAI收割
来源：地质与地球物理研究所
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