Magma Chamber Process of Post-collisional Magmatism: Insight from Textural and Elemental Characteristics of Plagioclase from the Tatun Volcanic Group, Northern Taiwan Volcanic Zone
文献类型：CNKI期刊论文
| 作者 | ZHANG Xia; GUO Kun; ZHANG Yu ; LAI Zhiqing; JIANG Shulong; JIANG Wenpeng; LI Jingbo
|
| 发表日期 | 2022-10-15 |
| 出处 | Acta Geologica Sinica(English Edition)
 |
| 关键词 | plagioclase textural and compositional features dynamics of magma system Tatun Volcanic Group |
| 英文摘要 | The Taiwan mountain belt, one of the youngest orogenies in the world, is caused by the collision of the Luzon arc with the Eurasian margin, which leads to post-collisional extension and magmatism in the Northern Taiwan Volcanic Zone(NTVZ). The magma chamber process in this region has not previously been elucidated in detail. In this paper, the textural and compositional features of plagioclase phenocrysts in basalt from the Tatun Volcanic Group(TTVG) were studied to restrict the dynamics of magma system. Results show that the magma melts in TTVG are mainly sourced from the underlying MORB-like mantle wedge but influenced by incorporation of subduction components, causing the elevated Sr/Y and Ba/Y ratios in magma melts. The subduction components are mainly transported in the form of sediment melt. The plagioclase phenocrysts in the TTVG volcanic rocks are generally coarsely core-sieved with a clear rim. The An contents in the rims of plagioclase are much lower than those of cores, and elevated FeO concentrations are detected in the plagioclase rims. We propose there exists a double-layer magma chamber in this region. The core of the plagioclase was crystalized in the deeper quiescent magma chamber(～21 km), which was subsequently partially dissolved during the ascent of magma melt under H_2O-undersaturated condition, forming the typical coarsely sieved texture and synneusis. When this crystal-rich melt migrates into the shallower chamber, water saturation is reached and more sodic plagioclase formed as the rim of phenocryst. Due to the considerably higher fO_2 in the shallow chamber than in the deeper one, and the distribution of Fe between plagioclase and melt positively correlates with fO_2, the FeO content in the plagioclase rim elevates in conjunction with increasing fO_2. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | funded by the Shandong Provincial Natural Science Foundation, China (No. ZR2019BD010) ; the National Natural Science Foundation of China (No. 42276085) ; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences (No. MGE2021KG01) ; Pilot National Laboratory for Marine Science and Technology (Qingdao) (No. JCZX202014) ; the Key Laboratory Submarine Geoscience and Prospecting Techniques, Ministry of Education, Ocean university of China |
| 卷 | v.96期:05页:121-133 |
| 语种 | 英文; |
| 分类号 | P588.11 |
| ISSN号 | 1000-9515 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/187305]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.ShandongProvinceNuclearIndustryGeologicalGroup248 2.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 3.KeyLabofSubmarineGeosciencesandProspectingTechniques,MOEandCollegeofMarineGeosciences,OceanUniversityofChina 4.PilotNationalLaboratoryforMarineScienceandTechnology(Qingdao) |
| 推荐引用方式 GB/T 7714 | ZHANG Xia,GUO Kun,ZHANG Yu,et al. Magma Chamber Process of Post-collisional Magmatism: Insight from Textural and Elemental Characteristics of Plagioclase from the Tatun Volcanic Group, Northern Taiwan Volcanic Zone. 2022. |
入库方式： OAI收割
来源：海洋研究所
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。