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| Sedimentary-diagenetic processes of the Carboniferous Shikebutai iron deposit in West Tianshan Mountains : Evidences from petrography and mineralogy | |
| Zhang Xin1,2; Dong ZhiGuo1,2; Peng ZiDong1,2; Zhang LianChang1,2; Zhang BangLu3,4; Wang ChangLe1,2 | |
| 2022-10-01 | |
| Source Publication | ACTA PETROLOGICA SINICA
 |
| ISSN | 1000-0569 |
| Volume | 38Issue:10Pages:3125-3142 |
| Abstract | The Shikebutai iron deposit is located in the western end of the Awulale metallogenic belt in the West Tianshan Mountains. It is a typical sedimentary iron deposit in this metallogenic belt. At present, there are two opinions about its genesis, namely, the exhalative deposition and the chemical deposition ( similar to banded iron formation). Previous studies mostly focused on the geological and geochemical characteristics of the deposit, but analysis of its ores and mineral composition and sedimentationdiagenesis ( metallogenic) process is relatively weak. Therefore, this paper selected different types of ores in the Shikebutai iron deposit to carry out detailed petrographic and mineralogical studies, in an attempt to provide key information for revealing the genesis of the deposit during the formation of the iron deposit. Petrographic analysis shows that the Shikebutai iron deposit is mainly composed of hematite, jasper ( quartz), pyrite, barite and a small amount of siderite. According to the morphological characteristics, hematite can be divided into four structures: plate columnar, scale ( phylloid), granular structure and particulate structures. Among them, the particulate extremely fine hematite is a primary mineral, which is speculated to be formed by dehydration of ferric hydroxide in the early diagenetic stage; while the coarse -grained hematite is formed by early particulate hematite recrystallization in the late diagenesis or weak metamorphism. The siderite is generally poor of crystallinity, often with fine quartz and hematite inclusions and coexisting with organic matter, indicating that it may be formed by ferric hydroxide through dissimilatory iron reduction ( DIR) in diagenetic stage. The pyrite is mainly coarse -grained, with a Co/Ni ratio located in the hydrothermal genetic area ( averaged at 3. 44), indicating that it belongs to hydrothermal pyrite. Most of the barites are anhedral to subhedral structure with relatively fine particle sizes, indicating that they should also be submarine hydrothermal sediments. According to the characteristics of the ore body, the ore fabrics, the mineral compositions, the relationship between mineral particles and the mineral genesis, the metallogenic process of the deposit is divided into two stages: the sedimentary and diagenetic stages. In the sedimentary stage, the mineral assemblage is dominated by original sediments, including ferric hydroxide, amorphous silica, amorphous silica -ferquartz, jasper, and part of Fe ( III) hydroxides reacted with organic matter to form siderite. The mineral composition of the formula Shikebutai iron deposit is mainly composed of hematite, containing typical minerals such as iron jasper, pyrite and barite, but lacking silicate minerals, which is similar to modern seafloor hydrothermal metal -bearing sediments and Paleozoic jasper deposits. This is quite different from the mineral composition characteristics of a large number of magnetite, quartz and silicate minerals in Precambrian banded iron formation ( BIF), indicating that the formation process of the deposit is similar to modern seafloor hydrothermal metal bearing sediments. It shows that the Shikebutai iron deposit should be of submarine exhalation sedimentation origin.ric hydroxide gel and other loose sediments, together with some crystalline minerals such as barite and pyrite. In the diagenetic stage, the early sediments were dehydrated to form hematite, |
| Keyword | Hematite Siderite Mineral genesis Sedimentary-diagenetic processes Shikebutai iron deposit West Tianshan Mountains |
| DOI | 10.18654/1000-0569/2022.10.14 |
| WOS Keyword | SEA-FLOOR ; GEOCHEMISTRY ; HEMATITE ; SULFIDE ; ISOTOPE ; ORIGIN ; EVOLUTION ; OXIDATION ; SULFATE ; NORWAY |
| Language | 英语 |
| WOS Research Area | Geology |
| WOS Subject | Geology |
| WOS ID | WOS:000905324300014 |
| Publisher | SCIENCE PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/106849 |
| Collection | 矿产资源研究院重点实验室 |
| Corresponding Author | Wang ChangLe |
| Affiliation | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.China Geol Survey, Dev & Res Ctr, Beijing 100037, Peoples R China 4.China Univ Geosci, Beijing 100083, Peoples R China |
| First Author Affilication | Key Laboratory of Mineral Resources, Chinese Academy of Sciences |
| Corresponding Author Affilication | Key Laboratory of Mineral Resources, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Zhang Xin,Dong ZhiGuo,Peng ZiDong,et al. Sedimentary-diagenetic processes of the Carboniferous Shikebutai iron deposit in West Tianshan Mountains : Evidences from petrography and mineralogy[J]. ACTA PETROLOGICA SINICA,2022,38(10):3125-3142. |
| APA | Zhang Xin,Dong ZhiGuo,Peng ZiDong,Zhang LianChang,Zhang BangLu,&Wang ChangLe.(2022).Sedimentary-diagenetic processes of the Carboniferous Shikebutai iron deposit in West Tianshan Mountains : Evidences from petrography and mineralogy.ACTA PETROLOGICA SINICA,38(10),3125-3142. |
| MLA | Zhang Xin,et al."Sedimentary-diagenetic processes of the Carboniferous Shikebutai iron deposit in West Tianshan Mountains : Evidences from petrography and mineralogy".ACTA PETROLOGICA SINICA 38.10(2022):3125-3142. |
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