Mineralogical and geochemical characteristics of Motuosala exhalative sedimentary Fe-Mn deposit in the West Tianshan, Xinjiang, NW China
文献类型：期刊论文
| 作者 | Dong ZhiGuo1,5,6; Zhang BangLu2,3,4; Shi FangPing1,5,6; Zhang LianChang1,5,6; Gao BingYu1,6; Zhang Xin1,5,6; Peng ZiDong1,6; Wang ChangLe1,6 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2021-04-01 |
| 卷号 | 37期号:4页码:1099-1121 |
| ISSN号 | 1000-0569 |
| 关键词 | Exhalative sedimentary Geochemistry Mineralogy Hydrothermal feldspar rock Manganese ore bed Motuosala West Tianshan |
| DOI | 10.18654/1000-0569/2021.04.09 |
| 英文摘要 | The Motuosala Fe-Mn deposit is located in the eastern end of the Awulale metallogenic belt in the West Tianshan, and the study about it is relatively weak. So far, the origins of this deposit include exhalative sedimentary, sedimentary-hydrothermal alteration, and colloidal chemical deposition. In this paper, the mineralogical composition, texture-structure and geochemical characteristics of the uppermost manganese ore bed and its wall rocks are studied in detail, and the origin of this Fe-Mn deposit is further discussed based on previous research results. For the first time, we found hydrothermal feldspar rock in Motuosala area. It is mainly composed of albite, K-feldspar and minor barite, aegirine, justite etc., which is similar to "white smoker"-type exhalative rock. The uppermost manganese ore bed is mainly composed of tephroite, braunite, parsettensite, vredenburgite and minor barite, bixbyite etc., which shows typical intraclastic texture indicating that it is deposited near the seafloor hydrothermal vent. Manganese ore bed have low Al/(Al + Fe + Mn)values (0 similar to 0. 02), relative high Si/Al values (7. 9 similar to 10. 9)and high Fe/Ti values (428 similar to 1353). After UCC normalization, manganese ore bed are obviously enriched in Zn, Ba and Pb;while Co, Ni and Cu are not obviously enriched. The above geochemical characteristics are consistent with those of modern submarine hydrothermal iron-manganese sediments. In the discrimination diagrams of Fe/Ti.Al/(Al + Fe + Mn), SiO2. Al-2 O-3, 10 x (Co + Ni + Cu). Fe-Mn, 100 x (Zr + Ce + Y)-15 x (Cu + Ni)-(Fe + Mn)/4 and so on, the Mn and Fe ore beds samples of Motuosala completely fall into the submarine hydrothermal sedimentary area. PAAS-normalized REE patterns of Mn and Fe ore beds of Motuosala have significant negative Ce anomalies, positive Eu anomalies and positive Y anomalies, which is typical to modern submarine hydrothermal Fe-Mn sediments Based on a comprehensive analysis of the above mineralogical, petrological and geochemical characteristics and previous research results, we suggest that the Motuosala Fe-Mn deposit is exhalative sedimentary in origin, and the composition, temperature and intensity of seafloor hydrothermal solution changed alternately, which may be closely related to the intermittent activities of contemporaneous submarine volcanoes. The Fe and Mn ore beds coexist in Motuosala but the separation degree between Fe and Mn is relatively high, which is unique in the Phanerozoic sedimentary manganese deposits. In view of the previous reports on the existence of bacteria and algae-like microbial fossils in motuosala iron ores, we speculate that the Fe and Mn separation process in Motuosala is not only controlled by the redox changes of the sedimentary environment, the selective oxidative precipitation by microorganisms may also play an important role, which is worthy of further study |
| WOS关键词 | RARE-EARTH-ELEMENT ; MID-ATLANTIC RIDGE ; MANGANESE DEPOSIT ; FERROMANGANESE NODULES ; HYDROTHERMAL MINERALIZATION ; IRON DEPOSIT ; CRUSTS ; CONSTRAINTS ; CHEMISTRY ; ISOTOPES |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000653537300009 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102028]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Zhang LianChang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Minist Nat Resources, Mineral Explorat Tech Guidance Ctr, Beijing 100083, Peoples R China 3.China Univ Geosci, Beijing 100083, Peoples R China 4.China Geol Survey, Dev & Res Ctr, Beijing 100037, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong ZhiGuo,Zhang BangLu,Shi FangPing,et al. Mineralogical and geochemical characteristics of Motuosala exhalative sedimentary Fe-Mn deposit in the West Tianshan, Xinjiang, NW China[J]. ACTA PETROLOGICA SINICA,2021,37(4):1099-1121. |
| APA | Dong ZhiGuo.,Zhang BangLu.,Shi FangPing.,Zhang LianChang.,Gao BingYu.,...&Wang ChangLe.(2021).Mineralogical and geochemical characteristics of Motuosala exhalative sedimentary Fe-Mn deposit in the West Tianshan, Xinjiang, NW China.ACTA PETROLOGICA SINICA,37(4),1099-1121. |
| MLA | Dong ZhiGuo,et al."Mineralogical and geochemical characteristics of Motuosala exhalative sedimentary Fe-Mn deposit in the West Tianshan, Xinjiang, NW China".ACTA PETROLOGICA SINICA 37.4(2021):1099-1121. |
入库方式： OAI收割
来源：地质与地球物理研究所
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