Study on geochemistry and micro-area characteristics of Paleoproterozoic chemical sedimentary rocks from Zankan area, West Kunlun, China
文献类型：期刊论文
| 作者 | Li HongZhong1,2; Zhai MingGuo1; Zhang LianChang1; Li ZhiQuan3; Zheng MengTian1; Niu Jia2,4; Yu PengPeng2,4 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2016 |
| 卷号 | 32期号:1页码:233-250 |
| 关键词 | Paleoproterozoic Chemical Sedimentary Rocks Geochemistry Micro-area characteristics Depositional Environment Zankan area West Kunlun |
| 文献子类 | Article |
| 英文摘要 | Zankan iron ore deposit is one of the typical iron ore in West Kunlun area, China. There exist series of chemical sedimentary iron ore layers and siliceous rocks in the Zankan ore area. In this study, we studied the geochemical- and microfabric characteristics as well as mineral geochemistry of these chemical sedimentary rocks, whose analytical results supported that the ore deposit was sedimentary metamorphic genesis and were formed in the continental marginal sea with subsequent influence. Under the microscope, the iron-rich ore has obvious banded structure with quartz, magnetite and pyroxene, whereas siliceous rocks are characterized by close packed structure of fine grain and microcrystalline quart. The XRD and EBSD analyses shows that the iron-rich iron bands of the iron ore are mainly composed of magnetite, pyroxene and trace apatite. The cell parameters of magnetite are a = b = c = 8.394 angstrom and z = 8, which quite agree with the characteristics of sedimentary metamorphic iron ore. LA-ICP-MS analysis shows that, the average oxide contents of impurity elements in magnetite reduce from Cr2O3 (2764 x 10(-6)) Al2O3, (2494 x 10(-6)), V2O5 (1494 x 10(-6)) SiO2 (1255 x 10(-6)) TiO2 (589.7 x 10(-6)) MnO (162.5 x 10(-6)) to MgO (114.9 x 10(-6)). These mineral characteristics are consistent with sedimentary metamorphic iron ore. According to the geochemical characteristics of total bulk of siliceous rocks, the SiO2 ranges from 70.58% to 81.78% with Ba, U and Sigma REE averaged 372.4 x 10(-6), 2.21 x 10(-6) and 97.37 x 10(-6), respectively. These characteristics agreed with hydrothermal sediments and are strongly supported by the low crystallinity degree of quartz with close packed structure. However, some of the siliceous rocks showed relatively high Al2O3 content and Sigma REE value with unclear Eu abnormality and denoted the contribution of non-hydrothermal sediments from the continent. The depositional environment for the chemical sedimentary rocks is continental marginal sea and is supported by the siliceous rocks with Al/(Al + Fe + Mn) value 0.68 similar to 0.96, MnO/TiO2 value 0 similar to 0.05, Al/(Al + Fe) value 0.74 similar to 0.97, Sc/Th value 2.22 similar to 7.07, U/Th value 0.33 similar to 0.86 and Al2O3/TiO2 value averaged 32.24. The Ni/Co value of siliceous rocks averaged 3.10 is consistent with oxygen-rich environments, while the Sr/Ba value averaged 0.23 reveals weak hydrodynamic force during the deposition of the siliceous rocks. They indicate that the original formation environment of siliceous rocks and iron ore in Zankan area was relative rich in oxygen with weak hydrodynamic force. The geochemical characteristics of ore in Zankan area show slight differences from typical BIF due to the subsequent tectonic-magmatic events. However, the petrology, geochemistry and mineralogical characteristics above agree well with the typical BIF. Thus, the Zankan iron ore deposit belongs to the Paleoproterozoic sedimentary metamorphic iron ore of BIF, which was formed in the continental marginal sea and suffered the influence of the subsequent tectonic-magmatic events. |
| WOS关键词 | RARE-EARTH-ELEMENTS ; BANDED-IRON-FORMATIONS ; CONTINENTAL-CRUST ; SOUTH-AFRICA ; CHERTS ; PROVENANCE ; ORIGIN ; CRATON ; ENVIRONMENTS ; PETROGENESIS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000370217700023 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62059]  |
| 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 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resource, Beijing 100029, Peoples R China 2.Guangdong Prov Key Lab Geol Proc & Mineral Resour, Guangzhou 510275, Peoples R China 3.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 4.Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li HongZhong,Zhai MingGuo,Zhang LianChang,et al. Study on geochemistry and micro-area characteristics of Paleoproterozoic chemical sedimentary rocks from Zankan area, West Kunlun, China[J]. ACTA PETROLOGICA SINICA,2016,32(1):233-250. |
| APA | Li HongZhong.,Zhai MingGuo.,Zhang LianChang.,Li ZhiQuan.,Zheng MengTian.,...&Yu PengPeng.(2016).Study on geochemistry and micro-area characteristics of Paleoproterozoic chemical sedimentary rocks from Zankan area, West Kunlun, China.ACTA PETROLOGICA SINICA,32(1),233-250. |
| MLA | Li HongZhong,et al."Study on geochemistry and micro-area characteristics of Paleoproterozoic chemical sedimentary rocks from Zankan area, West Kunlun, China".ACTA PETROLOGICA SINICA 32.1(2016):233-250. |
入库方式： OAI收割
来源：地质与地球物理研究所
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