Occurrence and magmatic origin of platinum-group minerals in the Hongge layered intrusion, SW China
文献类型：期刊论文
| 作者 | Bai, Yuying2,3,4; Tan, Wei1,2,3; Xing, Jieqi2,3,4 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2023-10-01 |
| 卷号 | 255页码:11 |
| 关键词 | Platinum-group elements (PGEs) Te As Bi Sb and Sn (TABS) Platinum-group minerals (PGMs) Hongge mafic-ultramafic layered intrusion |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2023.105776 |
| 英文摘要 | Platinum-group elements (PGEs) are typically hosted in the base metal sulfides (BMS) and platinum-group minerals (PGMs) of magmatic Ni-Cu-(PGE) sulfide deposits. The PGM may crystallize directly from sulfide melt, via exsolution from the BMS on sub-solidus cooling or recrystallization from them during metamorphism and hydrothermal overprints. Nevertheless, the distribution and origin of the major species of PGMs in S-poor mafic-ultramafic rocks, e.g., many layered intrusions hosting Fe-Ti-V-Cr oxide deposits, remain unclear. The origin of PGMs in these rocks can be determined by their paragenesis and crystallographic orientations. Here, we systematically investigate the major species of PGMs in the Hongge layered intrusion (SW China), and examine the distribution of PGMs and the orientation relationships between PGMs and host minerals using the FIBHRTEM techniques. A total of 52 grains of PGMs are identified from the olivine clinopyroxenite of the lower zone and Fe-Ti oxide-bearing olivine clinopyoxenite in the middle zone of the intrusion. They mainly include Ptarsenide and Pd(Bi,Te,Sb) compounds. Pt-arsenide mainly occurs as discrete euhedral sperrylite (PtAs2). The TEM analyses reveal that sperrylite and adjacent pyrrhotite have no specific crystallographic orientation relationships and form incoherent grain boundaries at their contact, indicating that the euhedral sperrylite likely crystallized directly from silicate melt and attached to the BMS and other coexisting minerals, rather than exsolved from precursor PGE-bearing BMS. The Pd(Bi,Te,Sb) compounds present as anhedral grains of froodite (PdBi2), sobolevskite [Pd(Bi,Te)], merenskyite (PdTe2), and stibiopalladinite (Pd5Sb2). These grains are either enclosed within, attached to, or interstitial to the BMS, Fe-Ti oxides and silicates, suggesting that they were unlikely exsolved solely from PGE-bearing BMS. The HRTEM images reveal that the anhedral Pd(Bi,Te,Sb) compounds can be monocrystals or polycrystal. Monocrystal Pd(Bi,Te,Sb) compounds were not subjected to postcrystallization modification, and polycrystal Pd(Bi,Te,Sb) compounds are composed of numerous randomly distributed crystals. Given the anhedral grain shape, it is likely that the Pd(Bi,Te,Sb) compounds can crystallize to form different types of Pd-bearing PGMs from early precipitated Pd-bearing Bi(Te,Sb) melts. This study shows that the presence of Te, As, Bi, Sb and Sn (TABS) can play a crucial role in scavenging PGEs from S-undersaturated mafic magmas. Being long neglected, discrete PGMs, rather than PGE-bearing BMS, are likely the major endowment of PGEs in the Hongge layered intrusion. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001031766600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74529]  |
| 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.Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bai, Yuying,Tan, Wei,Xing, Jieqi. Occurrence and magmatic origin of platinum-group minerals in the Hongge layered intrusion, SW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2023,255:11. |
| APA | Bai, Yuying,Tan, Wei,&Xing, Jieqi.(2023).Occurrence and magmatic origin of platinum-group minerals in the Hongge layered intrusion, SW China.JOURNAL OF ASIAN EARTH SCIENCES,255,11. |
| MLA | Bai, Yuying,et al."Occurrence and magmatic origin of platinum-group minerals in the Hongge layered intrusion, SW China".JOURNAL OF ASIAN EARTH SCIENCES 255(2023):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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