Genesis,evolution and rare metal enrichment mechanism of the Early Devonian granites in Chinese Altai
文献类型：期刊论文
| 作者 | Chen ZhiWei1,3,4; Yuan Chao3,4; Lin ZhengFan2; Huang ZongYing3,4; Wang XinYu3,4 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 39期号:11页码:3392-3416 |
| 关键词 | Chinese Altai Early Devonian granite Petrogenesis Highly fractionated granite Rare metal |
| ISSN号 | 1000-0569 |
| DOI | 10.18654/1000-0569/2023.11.11 |
| 英文摘要 | The enrichment mechanism of rare metal elements in continental crust is closely related to the genesis and evolution of granites. As a typical area of the Central Asian orogenic belt, the Altai orogenic belt is distributed along the borders of China, Mongolia, Kazakhstan and Russia. The Altai orogenic belt is a famous metallogenic province of rare metals in the world, characterized by various rare metal deposits such as Li, Be, Nb, Ta and W. Its Chinese segment, namely the Chinese Altai, underwent intense crustal reworking during the period of Paleozoic and Early Triassic, producing plentiful S -type granitic plutons. In this study, we conducted a systematic study of petrography, zircon chronology, zircon trace elements and whole rock geochemistry on three representative Early Devonian granitic plutons, namely Kuwei, Xiaokalasu and Yeliuman plutons, aiming to elucidate the enrichment processes of Nb, Ta and W in terms of the petrogenesis and evolution of these granites. LA-ICP-MS zircon U-Pb dating results show that the Kuwei, Xiaokalasu and Yeliuman granites were formed at 403 +/- 3Ma, 399 +/- 2Ma/404 +/- 3Ma and 404 +/- 3Ma, respectively. Although these granites have different silica ( SiO2 =71. 5% similar to 78. 5%) and potassium ( K2O = 1. 01 % similar to 5. 96%) contents, they are all variably peraluminous ( A/CNK = 1. 01 1. 65) and possess low oxygen fugacity ( Ln (fO(2)) = -23 similar to -8) In terms of trace element composition, these granites are rich in Rb, Th, Pb and Hf, with striking depletion in P, Ti, Ba and Sr. These granites samples show different degrees of enrichment in rare metals ( e. g. Be : 1.07 x 10(-6) similar to 66. 8 x 10(-6), Nb 5. 8 x 10(-6) 73. 3 x 10(-6), Ta 0.29 x 10(-6) 115 x 10(-6), W : 0. 1 x 10(-6) 31. 9 x 10(-6), Sn 1.4 x 10(-6) 28.5 x 10(-6)). Isotopically, the three granites have similar (Sr-86/Sr-87), values of 0. 7056 similar to 0. 7111 and epsilon(Nd) (t) values of 1. 9 + 0. 3, which are within the ranges of Habahe Group in Chinese Altai (epsilon(Nd)(t) = 5. 3 +9. 1), suggesting that they may have originated from partial melting of Habahe Group. The high K2O/Na2O (0. 7-2. 0) and Rb/Sr ( 0. 6-1. 8) ratios of these granites indicate that these granites may be formed by dehydration melting of the Habahe Group greywackes. Our study shows that the three plutons were derived from similar source but have different degree of rare metal enrichment characteristics. High degree of fractional crystallization and hydrothermal activity have substantiallyincreased the rare -metal concentrations in the granites of Kuwei and Xiaokalasu plutons, but fail to give rise to remarkable enrichment in the Yeliuman muscovite granites due to the crystallization of rare -metal -rich minerals ( e. g., biotite) during magma differentiation. Although the Paleozoic granites did not generate significant rare -metal mineralization in the Chinese Altai during the Early Paleozoic, their preliminary enrichment in rare -metals may have laid a base for further mineralization in subsequent crustal reworking. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001097943000011 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/79087]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Chen ZhiWei |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Nanjing Univ, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 4.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen ZhiWei,Yuan Chao,Lin ZhengFan,et al. Genesis,evolution and rare metal enrichment mechanism of the Early Devonian granites in Chinese Altai[J]. ACTA PETROLOGICA SINICA,2023,39(11):3392-3416. |
| APA | Chen ZhiWei,Yuan Chao,Lin ZhengFan,Huang ZongYing,&Wang XinYu.(2023).Genesis,evolution and rare metal enrichment mechanism of the Early Devonian granites in Chinese Altai.ACTA PETROLOGICA SINICA,39(11),3392-3416. |
| MLA | Chen ZhiWei,et al."Genesis,evolution and rare metal enrichment mechanism of the Early Devonian granites in Chinese Altai".ACTA PETROLOGICA SINICA 39.11(2023):3392-3416. |
入库方式： OAI收割
来源：广州地球化学研究所
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