Microstructural constraints for the formation of net-textured Fe-Ti oxide ores of the Baima layered intrusion in the Emeishan large igneous province, SW China
文献类型：期刊论文
| 作者 | Tan, Wei2,3; Bai, Yuying1,2; Cao, Yonghua2,3 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2024-03-01 |
| 卷号 | 262页码:11 |
| 关键词 | Net-textured Fe-Ti oxide ores Baima layered intrusion Electron back-scattered diffraction (EBSD) Misorientation |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2024.10602 |
| 英文摘要 | The mafic-ultramafic layered intrusions in the Emeishan large igneous province (LIP) host significant amounts of Fe, Ti and V resources. The Fe-Ti oxide ore layers hosted in these layered intrusions are variable in thickness and it is enigmatic how the large amounts of Fe-Ti oxides are accumulated to form the Fe-Ti oxide ore layers. The Fe-Ti oxide ore layers are mainly composed of net-textured ores, however, the processes to form the net-textured ores have not yet been well constrained due to lack of diagnostic microstructural evidence of Fe-Ti oxides in the ores. Here we use the electron back-scattered diffraction (EBSD) technique to characterize the microstructures of Fe-Ti oxides in the net-textured ores of the Baima layered intrusion in the Emeishan LIP, e.g., crystallographic orientation and neighbor-/random-pair misorientation, and to assess the formation model of net-textured ores. The net-textured ores are composed of silicate crystals (olivine, and minor plagioclase and clinopyroxene) isolated by interconnected matrix composed of Fe-Ti oxides (titanomagnetite and ilmenite) and minor sulfides. It is likely that the Fe-Ti oxides simultaneously crystallized from a common Fe-Ti-(P)-rich melt, but postdated olivine and other cumulus minerals. The compaction induced by the gravity of overlying cumulus minerals only caused weak intragrain deformation of Fe-Ti oxides so that the Fe-Ti oxides did not experience intense dynamic recrystallization. Instead, the relatively high temperature and water-rich condition facilitated the operation of static recrystallization, resulting in the straight or smoothly curved grain boundaries of Fe-Ti oxides. The neighbor-pair misorientation patterns of Fe-Ti oxides show the preference for low-angle misorientation, supporting the idea that adjacent crystallized Fe-Ti oxides were rotated to coincident orientation in a melt. This study provides new microstructural evidence for the presence of immiscible Fe-rich melt from which the Fe-Ti oxides crystallized to form the net-textured ores. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001159376200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/76264]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Tan, Wei |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tan, Wei,Bai, Yuying,Cao, Yonghua. Microstructural constraints for the formation of net-textured Fe-Ti oxide ores of the Baima layered intrusion in the Emeishan large igneous province, SW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2024,262:11. |
| APA | Tan, Wei,Bai, Yuying,&Cao, Yonghua.(2024).Microstructural constraints for the formation of net-textured Fe-Ti oxide ores of the Baima layered intrusion in the Emeishan large igneous province, SW China.JOURNAL OF ASIAN EARTH SCIENCES,262,11. |
| MLA | Tan, Wei,et al."Microstructural constraints for the formation of net-textured Fe-Ti oxide ores of the Baima layered intrusion in the Emeishan large igneous province, SW China".JOURNAL OF ASIAN EARTH SCIENCES 262(2024):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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