Discovery of the end-Early Paleozoic adakite in the Buqingshan area, Qinghai province, and its tectonic implications
文献类型：期刊论文
| 作者 | Bian QianTao; Pospelov, I. I.; Li HuiMin; Chang ChengFa; Li JiLiang |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2007-05-01 |
| 卷号 | 23期号:5页码:925-934 |
| 关键词 | adakite geochemistry end-Early Paleozoic A'nyemaqen ophiolite belt Tibetan plateau |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The adakite was recently revealed in the Buqingshan ophiolite complex, a western sector of the A'nyemaqen ophiolite belt in the northern part of the Qinghai-Tibet Plateau. The adakite consists of granodiorite-tonalite intruded in the Early Paleozoic ophiolite complex. The mineralogical phases pserent in the adakite are mainly plagioclase, quartz, hornblende, biotite, rare pyroxene and potassium feldspar; and accessory phases are apatite, zircon, sphene and magnetite etc. The adakite is calc-alkaline, and characterized by high SiO2 (63.65% similar to 71.59%), high Al2O3 (14.81% similar to 16.11%), high Na2O (4.68% similar to 5.33%) and Na2O/K2O (1.48 similar to 3.08,av. 2.39) ratios, high Sr(444.08 x 10(-6) similar to 560.41 x 10(-6)) and Sr/Y (50.8 similar to 105.3), rich in large ion lithophile elements (LILE), depleted in high strength field elements (HFSE), weakly negative Eu anomalies, strong depletion of heavy rare earth elements (e.g., Yb = 0.38 x 10(-6) similar to 0.74 x 10(-6)) and Y (4.93 x 10(-6) similar to 11.03 x 10(-6)), high La/Yb (44.93 similar to 90.97), positive Ba and Pb but negative Nb and P anomalies. These geochemical characteristics suggest that the Buqingshan adakite belongs to typical adakite (O-type, HSA). A TIMS zircon U-Pb age of 402 +/- 24Ma for the adakite have been obtained. The Buqingshan adakite was most probably derived by the partial melting of the subducting Kunlun-Qilian-Qinling oceanic crust (basaltic oceanic crust plus its overlying sediment) at garnet amphibolite-facies condition. The discovery suggests that the part of the Kunlun-Qilian-Qinling oceanic crust of the study area was subducted northward, and the subduction zone was situated to the south of the A'nyemaqen ophiolite belt in the end-Early Paleozoic period. It is also of implication that porphyry-type and hydrothermal-type An, Ag, Cu, Mo mineralization related with typical adakite probably existed in the A'nyemaqen ophiolite belt. |
| WOS关键词 | OCEAN CRUST ; MECHANISMS ; SEDIMENT ; PLATEAU ; ZIRCON ; MAGMAS ; MANTLE ; CHINA ; AGE ; PB |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000248135100007 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67667]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Bian QianTao |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Russian Acad Sci, Inst Geol, Moscow 109017, Russia 3.China Geol Survey, Tianjin Inst Geol & Min Resources, Tianjin 300170, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bian QianTao,Pospelov, I. I.,Li HuiMin,et al. Discovery of the end-Early Paleozoic adakite in the Buqingshan area, Qinghai province, and its tectonic implications[J]. ACTA PETROLOGICA SINICA,2007,23(5):925-934. |
| APA | Bian QianTao,Pospelov, I. I.,Li HuiMin,Chang ChengFa,&Li JiLiang.(2007).Discovery of the end-Early Paleozoic adakite in the Buqingshan area, Qinghai province, and its tectonic implications.ACTA PETROLOGICA SINICA,23(5),925-934. |
| MLA | Bian QianTao,et al."Discovery of the end-Early Paleozoic adakite in the Buqingshan area, Qinghai province, and its tectonic implications".ACTA PETROLOGICA SINICA 23.5(2007):925-934. |
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。