A 50 m.y. melting model for the rare metal-rich Koktokay pegmatite in the Chinese Altai: Implications from a newly identified Jurassic granite
文献类型：期刊论文
| 作者 | Han, Jinsheng3; Zhao, Zhenhua2; Hollings, Pete1; Chen, Huayong2
|
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2023 |
| 卷号 | 135期号:5-6页码:1467-1479 |
| 关键词 | ZIRCON U-PB NO. 3 PEGMATITE NW CHINA EXTREME FRACTIONATION COLUMBITE-TANTALITE CONTINENTAL-CRUST NORTHWEST CHINA OROGENIC BELT HF ACCRETIONARY |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36513.1 |
| 英文摘要 | The petrogenesis of the world famous Koktokay No. 3 pegmatite in the Chinese Altai Mountains is still enigmatic due to its superenrichment of rare metals and the apparent absence of a parental granite. We present results from a granite apophysis that was recently discovered in the No. 3 pegmatite open pit. Results show that it has low K/ Rb (32.35–38.76), Zr/Hf (13.78–23.30), Nb/ Ta (1.00–6.02), and extremely low K2O/Na2O (0.12–0.20) ratios, which, together with its mica composition and the occurrences of garnet, indicate that it is a highly evolved muscovite albite granite. Columbite and apatite from the granite apophysis yielded U-Pb ages of 182.3 ± 1.0 Ma and 184.9 ± 4.3 Ma, respectively, which are younger than the Triassic ages (ca. 210 Ma) of the main magmatic stage but fall into the age range of the No. 3 pegmatite series (220–175 Ma). Both the granite and the apatite grains within it share nearly identical rare earth element patterns with the magmatic stage of the No. 3 pegmatite. The whole-rock ΕHf(t) values (t = 183 Ma) range from –0.11 to +1.32, consistent with those of the No. 3 pegmatite and indicating a similar source. We propose that the Jurassic granite represents a late pulse of magma injected as apophyses from a deep-seated magma chamber (perhaps from the lower crust), which overlapped with the early pegmatite and promoted the rare metal mineralization. The No. 3 pegmatite and the Jurassic granite may represent a continuous magmatic system with a 50 m.y. melting process, generating this unusual giant pegmatite intrusion with abundant rare metals. ? 2022 Geological Society of America |
| WOS研究方向 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000935187700001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80278]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 作者单位 | 1.Department of Geology, Lakehead University, 955 Oliver Road, Thunder Bay; ON; P7B 5E1, Canada 2.Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou; 510640, China 3.State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Resources, China University of Geosciences, Wuhan; 430074, China |
| 推荐引用方式 GB/T 7714 | Han, Jinsheng,Zhao, Zhenhua,Hollings, Pete,et al. A 50 m.y. melting model for the rare metal-rich Koktokay pegmatite in the Chinese Altai: Implications from a newly identified Jurassic granite[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2023,135(5-6):1467-1479. |
| APA | Han, Jinsheng,Zhao, Zhenhua,Hollings, Pete,&Chen, Huayong.(2023).A 50 m.y. melting model for the rare metal-rich Koktokay pegmatite in the Chinese Altai: Implications from a newly identified Jurassic granite.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,135(5-6),1467-1479. |
| MLA | Han, Jinsheng,et al."A 50 m.y. melting model for the rare metal-rich Koktokay pegmatite in the Chinese Altai: Implications from a newly identified Jurassic granite".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 135.5-6(2023):1467-1479. |
入库方式： OAI收割
来源：广州地球化学研究所
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