Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
| Ou, Quan1,2,3; Qian, Sheng-Ping4; Hoernle, Kaj5,6; Carvalho, Bruna B.7; Zi, Feng8; Wang, Kun9; Zhang, Le10; Liu, Jing-Yi3; Liao, Jia1 | |
| Magmatic processes within the plumbing system of the ultraslow-spreading southwest Indian ridge: constraints from olivine, plagioclase and melt inclusions | |
| Source Publication | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
 |
| ISSN | 0010-7999 |
| 2024-03-01 | |
| Volume | 179Issue:3Pages:27 |
| DOI | 10.1007/s00410-024-02098-0 |
| Language | 英语 |
| WOS Research Area | Geochemistry & Geophysics ; Mineralogy |
| Abstract | Processes taking place within the magma plumbing system can exert an important control on the composition of mid-ocean ridge basalts (MORB). Plagioclase ultraphyric basalts (PUBs) found at magma-poor mid-ocean ridges exhibit diverse disequilibrium characteristics, which can provide vital insights for distinguishing the complex effects of melt transport from those of source heterogeneity on the compositions of MORBs. Here, we present new insights into magmatic processes using integrated petrologic and geochemical studies of the PUBs from two zones ( 50(degrees) and 64(degrees)E longitude) along the ultraslow-spreading southwest Indian ridge (SWIR). The studied PUBs have complex mineral morphologies, including skeletal and acicular crystals, glomerocrysts with open and closed structure, reverse and normally zoned crystals and external and internal resorption even in single samples. Both low- and high-Fo olivine and An plagioclase crystals are in disequilibrium with their matrix glasses. Some plagioclase phenocrysts have repeated oscillatory zoning (An(77-86)) going from their core to rim and an abrupt decrease in An content toward the rim. Disequilibrium Sr isotopic compositions are present at several scales: between cores and rims of plagioclase crystals, between different plagioclase crystals and between plagioclase and their host lavas. Inferred pressures of magma storage range from 0.3 to 11.3 kbar. The textural and compositional diversity of crystals together with the variability in melt compositions reflect the combined influences of source heterogeneity and magmatic processes (e.g. crystallization, assimilation and magma mixing processes) taking place within crystal mushes. Our data combined with previous studies suggest that the magmatic processes within the SWIR magma plumbing system involve formation, disaggregation and juxtaposition of crystal-rich mush zones. |
| Keyword | Melt inclusion Plagioclase ultraphyric basalts (PUBs) Mush zone Magmatic processes Heterogeneous mantle source Southwest Indian Ridge (SWIR) |
| WOS ID | WOS:001169775800001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/77419 |
| Collection | 同位素地球化学国家重点实验室 |
| Corresponding Author | Ou, Quan; Qian, Sheng-Ping |
| Affiliation | 1.China Geol Survey, Changsha Gen Survey Nat Resources Ctr, Sankuang Res Grp, Changsha, Peoples R China 2.Northwest Univ, State Key Lab Continental Dynam, Xian, Peoples R China 3.Chengdu Univ Technol, Inst Sedimentary Geol, State Key Lab Oil Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China 4.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China 5.GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany 6.Univ Kiel, Inst Geosci, Kiel, Germany 7.Univ Studi Padova, Dipartimento Geosci, Padua, Italy 8.Hunan Univ Sci & Technol, Sch Earth Sci & Spatial Informat Engn, Xiangtan, Peoples R China 9.China Univ Min & Technol, Sch Resources & Geosci, Xuzhou, Peoples R China 10.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China |
| Recommended Citation GB/T 7714 | Ou, Quan,Qian, Sheng-Ping,Hoernle, Kaj,et al. Magmatic processes within the plumbing system of the ultraslow-spreading southwest Indian ridge: constraints from olivine, plagioclase and melt inclusions[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2024,179(3):27. |
| APA | Ou, Quan.,Qian, Sheng-Ping.,Hoernle, Kaj.,Carvalho, Bruna B..,Zi, Feng.,...&Liao, Jia.(2024).Magmatic processes within the plumbing system of the ultraslow-spreading southwest Indian ridge: constraints from olivine, plagioclase and melt inclusions.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,179(3),27. |
| MLA | Ou, Quan,et al."Magmatic processes within the plumbing system of the ultraslow-spreading southwest Indian ridge: constraints from olivine, plagioclase and melt inclusions".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 179.3(2024):27. |
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