| Mineral Chemistry Indicates the Petrogenesis of Rhyolite From The Southwestern Okinawa Trough | |
Chen Zuxing1,3; Zeng Zhigang1,2,3; Wang Xiaoyuan1,2; Zhang Yuxiang1,3; Yin Xuebo1; Chen Shuai1,2; Ma Yao1 ; Li Xiaohui1,3; Qi Hanyan1
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| 2017-12-01 | |
| 发表期刊 | JOURNAL OF OCEAN UNIVERSITY OF CHINA
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| 卷号 | 16期号:6页码:1097-1108 |
| 文章类型 | Article |
| 摘要 | To reveal the petrogenesis of rhyolite from the southwestern Okinawa Trough, the mineral chemistry of plagioclase, orthopyroxene, amphibole, quartz and Fe-Ti oxide phenocrysts were analyzed using an electron microprobe, and in suit Sr and Ba contents of plagioclase analysed by LA-ICPMS were chosen for fingerprinting plagioclases of different provenances. Results indicate an overall homogeneous composition for each of the mineral phases except for plagioclase phenocrysts which have a wide range of composition (An=39 similar to 88). Plagioclase crystals characterized by An contents of >70 are not in equilibrium with their whole-rock compositions, and coarse-sieved plagioclase phenocryst interiors record high An contents (>70) and Sr/Ba ratios (>7), which are similar to the those of plagioclase crystals in basalt. Therefore, these crystals must have been introduced to the rhyolitic magma from a more mafic source. Equilibrium temperatures estimated using orthopyroxene-liquid, iron-titanium oxide, titanium-in-quartz and amphibole geothermometers show consistent values ranging from 792 to 869.. The equilibrium pressure calculated using amphibole compositions is close to 121 MPa which corresponds to an approximate depth of 4 km. The fO(2) conditions estimated from Fe-Ti oxides and amphiboles plot slightly above the NNO buffer, which indicates that the rock formed under more oxidized conditions. Our results suggests that petrogenesis of the rhyolite due to basaltic magma ascend with the high An and Sr/Ba plaigoclases from deep magma chamber into the shallow chamber where the fractional crystallization and crustal assimilation happened. It also indicates that a two-layer magma chamber structure may occur under the southwestern Okinawa Trough. |
| 关键词 | Geothermobarometry Oxygen Fugacity Xenocrysts Magma Evolution Rhyolite Okinawa Trough |
| DOI | 10.1007/s11802-017-3344-2 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000414791700019 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/143041 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Chen Zuxing,Zeng Zhigang,Wang Xiaoyuan,et al. Mineral Chemistry Indicates the Petrogenesis of Rhyolite From The Southwestern Okinawa Trough[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2017,16(6):1097-1108. |
| APA | Chen Zuxing.,Zeng Zhigang.,Wang Xiaoyuan.,Zhang Yuxiang.,Yin Xuebo.,...&Qi Hanyan.(2017).Mineral Chemistry Indicates the Petrogenesis of Rhyolite From The Southwestern Okinawa Trough.JOURNAL OF OCEAN UNIVERSITY OF CHINA,16(6),1097-1108. |
| MLA | Chen Zuxing,et al."Mineral Chemistry Indicates the Petrogenesis of Rhyolite From The Southwestern Okinawa Trough".JOURNAL OF OCEAN UNIVERSITY OF CHINA 16.6(2017):1097-1108. |
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| Mineral Chemistry In（899KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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