Formation mechanisms of the Caotan carbonatite-type iron deposit in Lesser Qinling
文献类型：期刊论文
| 作者 | Zhao XiaoChen1,3; Yan Shuang2,3; Niu HeCai2,3; Zhao Xu2,3 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 39期号:11页码:3491-3505 |
| 关键词 | Caotan carbonatite Phoscorite Fe mineralization Magmatic evolution Oxygen fugacity |
| ISSN号 | 1000-0569 |
| DOI | 10.18654/1000-0569/2023.11.17 |
| 英文摘要 | The Caotan carbonatite is located in the northern end of the Lesser Qinling, and is about 18km away from the Huanglongpu carbonatite. However, the mineralization characteristics of the two carbonatites are distinct. The former is associated with the rare occurrence of carbonatite-type iron deposit, while the latter is the host of molybdenum -rare earth polymetallic deposit. Previous studies have confirmed that the Caotan carbonatite is the partial melting product of enriched mantle, and that it contains not only calcite carbonatite, but also early -crystallized dolomite carbonatite. However, few studies have been conducted to decipher the mechanism of the iron mineralization. Elemental and Sr-Nd-Pb isotopic compositions of the Caotan carbonatite and iron ore, and in situ trace element compositions of magnetite and apatite in the two types of samples were analyzed to reveal the formation mechanism of the carbonatitetype iron ore deposit. Based on the comprehensive study of petrography and geochemistry, magnetite phosphorite is identified in the Caotan carbonatite and represents the early -crystallized product of parent magmas. Therefore, the carbonatite is actually a complex composed of calcite carbonatite, dolomite carbonatite, magnetite phosphorite and iron ore. Moreover, the magnetite phosphorite and iron ore share similar Sr-Nd-Pb isotopic compositions, indicating that iron mineralization is the evolution product of iron -rich carbonatitic magma. Trace elemental characteristics of magnetite and apatite in the Caotan magnetite phosphorite and iron ore suggest that iron mineralization occurred during the magmatic stage. Nevertheless, the parent magma of iron ore displays a higher evolution degree than that of magnetite phosphorite, and it is not only rich in volatile components, but also has higher oxygen fugacity condition. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001097943000017 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/79175]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Yan Shuang |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao XiaoChen,Yan Shuang,Niu HeCai,et al. Formation mechanisms of the Caotan carbonatite-type iron deposit in Lesser Qinling[J]. ACTA PETROLOGICA SINICA,2023,39(11):3491-3505. |
| APA | Zhao XiaoChen,Yan Shuang,Niu HeCai,&Zhao Xu.(2023).Formation mechanisms of the Caotan carbonatite-type iron deposit in Lesser Qinling.ACTA PETROLOGICA SINICA,39(11),3491-3505. |
| MLA | Zhao XiaoChen,et al."Formation mechanisms of the Caotan carbonatite-type iron deposit in Lesser Qinling".ACTA PETROLOGICA SINICA 39.11(2023):3491-3505. |
入库方式： OAI收割
来源：广州地球化学研究所
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