Melting and melt segregation processes controlling granitic melt composition
文献类型：期刊论文
| 作者 | Yu, Yang1,2; Huang, Xiao-Long1,2; Weinberg, Roberto F.3; Sun, Min4; He, Peng-Li1,2; Zhang, Le2 |
| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2024-01-29 |
| 卷号 | 109期号:1页码:35-50 |
| 关键词 | Migmatite crustal anatexis disequilibrium melting chemical fractionation granite |
| ISSN号 | 0003-004X |
| DOI | 10.2138/am-2022-8594 |
| 英文摘要 | Several important processes in the petrogenesis of granite are still debated due to a poor understanding of complex interactions between minerals during the melting and melt segregation processes. To promote an improved understanding of the mineral-melt relationships, we present a systematic petrographic and geochemical analysis for melanosome and leucosome samples from the Triassic Jindong migmatite, South China. Petrographic observations and zircon U-Pb geochronology indicate that the Jindong migmatite was formed through water-fluxed melting of the Early Paleozoic gneissic granite (437 +/- 2 Ma) during the Triassic (238 +/- 1 Ma), with the production of melt dominated by the breakdown of K-feldspar, plagioclase, and quartz. The Jindong leucosomes may be divided into lenticular and net-structured types. Muscovite, plagioclase, and K-feldspar in the net-structured leucosome show higher Rb and much lower Ba and Sr contents than those in the lenticular leucosome. This may be attributed to the elevation of Rb and decreasing Ba and Sr abundances in melts during the segregation process due to early fractional crystallization of K-feldspar and plagioclase. These leucosomes show negative correlation between epsilon(Nd)(t) and P2O5, reflecting increasing dissolution of low-epsilon(Nd)(t) apatite during the melting process. The continuous dissolution of apatite caused saturation of monazite and xenotime in melt, resulting in the growth of monazite and xenotime around apatite in the melanosome. This process led to a sharp decrease of Th, Y, and REE with increasing P2O5 in the leucosome samples. This complex interplay of accessory mineral reactions in the source impacts REE geochemistry and Nd isotope ratios of granites. As the granites worldwide exhibit similar compositional and isotopic patterns to the Jindong leucosomes, we suggest that both the melting and melt segregation processes strongly control the granitic melt compositions. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001134521600003 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77385]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Huang, Xiao-Long |
| 作者单位 | 1.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 3.Monash Univ, Sch Earth Atmosphere & Environm, Clayton, Vic 3800, Australia 4.Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Yang,Huang, Xiao-Long,Weinberg, Roberto F.,et al. Melting and melt segregation processes controlling granitic melt composition[J]. AMERICAN MINERALOGIST,2024,109(1):35-50. |
| APA | Yu, Yang,Huang, Xiao-Long,Weinberg, Roberto F.,Sun, Min,He, Peng-Li,&Zhang, Le.(2024).Melting and melt segregation processes controlling granitic melt composition.AMERICAN MINERALOGIST,109(1),35-50. |
| MLA | Yu, Yang,et al."Melting and melt segregation processes controlling granitic melt composition".AMERICAN MINERALOGIST 109.1(2024):35-50. |
入库方式： OAI收割
来源：广州地球化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。