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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
2017-12-01
发表期刊JOURNAL OF OCEAN UNIVERSITY OF CHINA
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
DOI10.1007/s11802-017-3344-2
收录类别SCI
语种英语
WOS记录号WOS:000414791700019
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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
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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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