Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
| Yu, Yang1,2; Huang, Xiao-Long1,2; Weinberg, Roberto F.3; Sun, Min4; He, Peng-Li1,2; Zhang, Le1 | |
| Melting and melt segregation processes controlling granitic melt composition | |
| Source Publication | AMERICAN MINERALOGIST
 |
| ISSN | 0003-004X |
| 2024-01-29 | |
| Volume | 109Issue:1Pages:35-50 |
| DOI | 10.2138/am-2022-8594 |
| Language | 英语 |
| WOS Research Area | Geochemistry & Geophysics ; Mineralogy |
| Abstract | 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. |
| Keyword | Migmatite crustal anatexis disequilibrium melting chemical fractionation granite |
| WOS ID | WOS:001134521600003 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/77386 |
| Collection | 同位素地球化学国家重点实验室 |
| Corresponding Author | Huang, Xiao-Long |
| Affiliation | 1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, 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 |
| Recommended Citation 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. |
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