Subduction polarity of the prototethys: insights from the Yirba pluton of the western Kunlun range, NW China
文献类型：期刊论文
| 作者 | Yuan, C; Sun, M; Xiao, WJ; Zhou, H; Hou, QL; Li, JL |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2003-07-01 |
| 卷号 | 19期号:3页码:399-408 |
| 关键词 | western Kunlun volcanic arc granitoids proto-tethys subduction polarity active continental margin adakite |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The Yirba ( 128 km) pluton is an early Paleozoic dioritic intrusion of western Kunlun orogenic belt, northwest China as an important element when reconstructing the evolution history of this belt. Due to the scarcity of field data and methodological difference in studying this pluton, however, no consensus for. its age, source and tectonic setting has been adopted. In this paper, we present new geochronological and geochemical data for the Yirba pluton, aiming to better understand its age, source, and hence the early Paleozoic tectonic evolutionary history of western Kunlun. U-Pb data by single grain zircon analyses suggest that the Yirba pluton was emplaced 471 +/- 5 Ma ago and contains ca. 490 Ma zircon grains inherited from source, or captured in the magma chamber. The pluton is enriched in Al2O3 ( 15. 7% similar to 18. 4%), Sr (470 similar to 864 mug/g) and other LILEs (large ion lithosphile elements), but relatively depleted in HFSE (high field strength elements and HREE), with LREE-enriched patterns and low to medium europium anomalies ( deltaEu similar to0. 7 showing typical characteristics of I-type, volcanic arc grafiitoids. Although its relatively high Al2O3 , Sr and low MgO contents make it resemble adakite, its relatively high Yb (1. 92 similar to 2. 88 mug/g), Y (19. 4 similar to 34. 0 mug/g) contents, low Sr/Y ( 24. 2 similar to 37. 0), Zr/Sm ( 7. 3 similar to 21) and relatively high initial Sr isotope ratios ( 0. 7075 similar to 0. 7091) do not support a subducting slab origin. Its Nd model ages 1. 06 similar to 1. 35 Ga) indicate a juvenile source, while its 0 isotope compositions ( + 5. 7parts per thousand similar to + 7. 4parts per thousand) and Sr-O isotope relationship preclude significant involvement of sialic materials. The major, trace, REE and Nd-Sr-O isotope compositions strongly suggest that the Yirba pluton was formed by partial melting of mafic lower crust in a southward growing, active continental margin environment. The existence of volcanic arc granitoids in the south margin of the North Kunlun terrane suggests that the subduction polarity of the Proto-Tethys was northward. |
| WOS关键词 | CONSTRAINTS ; EVOLUTION ; SR ; ND ; GEOCHEMISTRY ; GRANITOIDS ; MOUNTAINS ; NAMIBIA ; ROCKS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000187675100003 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/78845]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Yuan, C |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Lithosphere Tecton Evolut, Beijing 100029, Peoples R China 4.Peking Univ, Dept Sci Tech, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yuan, C,Sun, M,Xiao, WJ,et al. Subduction polarity of the prototethys: insights from the Yirba pluton of the western Kunlun range, NW China[J]. ACTA PETROLOGICA SINICA,2003,19(3):399-408. |
| APA | Yuan, C,Sun, M,Xiao, WJ,Zhou, H,Hou, QL,&Li, JL.(2003).Subduction polarity of the prototethys: insights from the Yirba pluton of the western Kunlun range, NW China.ACTA PETROLOGICA SINICA,19(3),399-408. |
| MLA | Yuan, C,et al."Subduction polarity of the prototethys: insights from the Yirba pluton of the western Kunlun range, NW China".ACTA PETROLOGICA SINICA 19.3(2003):399-408. |
入库方式： OAI收割
来源：地质与地球物理研究所
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