Geochemical characteristics, and tectonic setting of the Laohushan basalts, North Qilian Mountains
文献类型：期刊论文
| 作者 | Qian, Q; Zhang, Q |
| 刊名 | ACTA GEOLOGICA SINICA-ENGLISH EDITION
 |
| 出版日期 | 2001-12-01 |
| 卷号 | 75期号:4页码:452-457 |
| 关键词 | North Qilian Mountains Laohushan basalts sediments geochemistry |
| ISSN号 | 1000-9515 |
| 文献子类 | Article |
| 英文摘要 | The Ordovician Laohushan ophiolite, located in the eastern part of the North Qilian Mountains, is mainly composed of meta-peridotites, gabbros and basalts alternating with sediments. The sediments are mainly turbidites, including sandstones, siltstones, cherts etc. Major elements show that the basalts are subalkaline tholeiites and may be analogous to ocean-floor basalts. Except a few N-MORBs, most of the basalts are E-MORBs as indicated by incompatible element ratios such as (La/Ce)(N), La/Sm, Ce/Zr, Zr/Y and Zr/Nb. Negative Nb anomaly is common but negative Zr, Hf and Ti anomalies are quite rare. Based on the geochemical characteristics, it is suggested that the Laohushan basalts were formed in a back-are basin. epsilon (Nd) (t) of the basalts ranges between +3.0 and +8.9 and (Sr-87/Sr-86)(i) ranges between 0.7030 and 0.7060, indicating a depleted mantle source which was mixed with more or less enriched mantle components. Furthermore, the petrography of the sandstones and geochemistry of the cherts suggest that the sediments were deposited near a continental margin. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000172268600013 |
| 出版者 | GEOLOGICAL SOC CHINA |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/76653]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Qian, Q |
| 作者单位 | CAS, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qian, Q,Zhang, Q. Geochemical characteristics, and tectonic setting of the Laohushan basalts, North Qilian Mountains[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2001,75(4):452-457. |
| APA | Qian, Q,&Zhang, Q.(2001).Geochemical characteristics, and tectonic setting of the Laohushan basalts, North Qilian Mountains.ACTA GEOLOGICA SINICA-ENGLISH EDITION,75(4),452-457. |
| MLA | Qian, Q,et al."Geochemical characteristics, and tectonic setting of the Laohushan basalts, North Qilian Mountains".ACTA GEOLOGICA SINICA-ENGLISH EDITION 75.4(2001):452-457. |
入库方式： OAI收割
来源：地质与地球物理研究所
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