Geochemistry and tectonic setting of copper-bearing porphyries on the southern margin of Tuba basin, Xinjiang.
文献类型：期刊论文
| 作者 | Zhang, LC; Wan, B; Li, WQ; Tang, HF |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2006 |
| 卷号 | 22期号:1页码:225-235 |
| 关键词 | late Paleozoic island arc porphyry copper deposit Adakite eastern Tianshan |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The eastern Tianshan porphyry copper belt is located on the southern margin of Tuha basin. Based on isotopic dating, the intrusive ages of copper-bearing porphyries were divided into two stages: early Carboniferous (i.g. Tuwu-Yandong porphyry) and late Carboniferous to early Permian (i.g. Sanchakou, Chihu and Linglong porphyry). The Contents of SiO(2) (64.92 similar to 73.05%), Al(2)O(3) (14.24 similar to 17.08%), MgO (0.92 similar to 2.16%), Y (6.03x10(-6) similar to 15.98x10(-6)), Yb (0.48x10(-6) similar to 1.43x10(-6)) and Sr (347x10(-6) similar to 920x10(-6)) and positive Eu anomalies of the plagiogranite porphyries indicate that Tuwu-Yandong and Sanchakou porphyries possess adakitic characteristics. The rocks also exhibit positive epsilon(Nd) (t) values (+5.3 similar to +7.6) and low initial (87)Sr/(86)Sr values (0.70330 similar to 0.70416). Such features are similar to those of adakites derived from partial melting of a subduction-related oceanic slab. Based on our study of the geology and geochemistry, we suggest that Tuwu-Yandong adakitic magma in the Dananhu island was formed by direct melting of an obliquely-subducting early Carboniferous oceanic slab, but Sanchakou adakitic magma was formed by partial melting of thickening lower crust in late-collisional orogen processes. Our studies indicate that large porphyry copper deposits are related to adakitic rocks, and small porphyry copper deposits (or ore spots) have normal calc-alkaline affinity. We propose that large porphyry copper deposits are related to adakitic, highly oxidized, and water-rich melts, their melts are eventually derived from slab melting. during flat subduction. |
| WOS关键词 | EASTERN TIANSHAN ; CONTINENTAL GROWTH ; METALLOGENIC BELT ; CHINA ; DEPOSITS ; MAGMAS ; EXPLORATION ; MOUNTAINS ; FEATURES ; AU |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000235920900022 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66346]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Inst Geochem, Guiyang 55002, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, LC,Wan, B,Li, WQ,et al. Geochemistry and tectonic setting of copper-bearing porphyries on the southern margin of Tuba basin, Xinjiang.[J]. ACTA PETROLOGICA SINICA,2006,22(1):225-235. |
| APA | Zhang, LC,Wan, B,Li, WQ,&Tang, HF.(2006).Geochemistry and tectonic setting of copper-bearing porphyries on the southern margin of Tuba basin, Xinjiang..ACTA PETROLOGICA SINICA,22(1),225-235. |
| MLA | Zhang, LC,et al."Geochemistry and tectonic setting of copper-bearing porphyries on the southern margin of Tuba basin, Xinjiang.".ACTA PETROLOGICA SINICA 22.1(2006):225-235. |
入库方式： OAI收割
来源：地质与地球物理研究所
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