Magmatic processes within the plumbing system of the ultraslow-spreading southwest Indian ridge: constraints from olivine, plagioclase and melt inclusions
文献类型：期刊论文
| 作者 | Ou, Quan2,8,9; Qian, Sheng-Ping10; Hoernle, Kaj1,3; Carvalho, Bruna B.4; Zi, Feng7; Wang, Kun6; Zhang, Le5; Liu, Jing-Yi2; Liao, Jia8 |
| 刊名 | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
 |
| 出版日期 | 2024-03-01 |
| 卷号 | 179期号:3页码:27 |
| 关键词 | Melt inclusion Plagioclase ultraphyric basalts (PUBs) Mush zone Magmatic processes Heterogeneous mantle source Southwest Indian Ridge (SWIR) |
| ISSN号 | 0010-7999 |
| DOI | 10.1007/s00410-024-02098-0 |
| 英文摘要 | 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. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001169775800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77418]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Ou, Quan; Qian, Sheng-Ping |
| 作者单位 | 1.GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany 2.Chengdu Univ Technol, Inst Sedimentary Geol, State Key Lab Oil Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China 3.Univ Kiel, Inst Geosci, Kiel, Germany 4.Univ Studi Padova, Dipartimento Geosci, Padua, Italy 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 6.China Univ Min & Technol, Sch Resources & Geosci, Xuzhou, Peoples R China 7.Hunan Univ Sci & Technol, Sch Earth Sci & Spatial Informat Engn, Xiangtan, Peoples R China 8.China Geol Survey, Changsha Gen Survey Nat Resources Ctr, Sankuang Res Grp, Changsha, Peoples R China 9.Northwest Univ, State Key Lab Continental Dynam, Xian, Peoples R China 10.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：广州地球化学研究所
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