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Petrology and mineralogy of pumice from the Iheya North Knoll, Okinawa Trough: Implications for the differentiation of crystal-poor and volatile-rich melts in the magma chamber
Zhang, Yuxiang1,3; Zeng, Zhigang1,2,3; Yin, Xuebo1; Qi, Haiyan1; Chen, Shuai1; Wang, Xiaoyuan1,2; Shu, Yunchao1,3; Chen, Zuxing1,3
2018-11-01
发表期刊GEOLOGICAL JOURNAL
ISSN0072-1050
卷号53期号:6页码:2732-2745
通讯作者Zeng, Zhigang([email protected])
摘要The Iheya North Knoll is a submarine hill that is covered with pumice in the Okinawa Trough. The petrology and mineralogy of the crystal-poor rhyolitic pumice collected from two sampling sites (T3 and T6) on the knoll were analysed in this article. The T6 pumice, which contains some mafic minerals (e.g., clinopyroxene, orthopyroxene), is slightly more crystal-rich (<5 vol.%) than the T3 pumice (<2 vol.%). However, both types of pumice are high-potassium rhyolites with similar Nd isotopic ratios and rare earth element patterns, as well as similar glass compositions, which indicates that they may fall along a line of descent of comagmatic evolution. The T6 pumice contains some xenomorphic clinopyroxenes that are not in equilibrium with their whole-rock composition, which suggests that the crystal-poor melt was extracted from a more mafic source. The T3 pumice features a flow structure, and its matrix glass records higher Cl concentrations and a lower total mass than the T6 pumice, which implies that the T3 melt has a higher volatile content and lower viscosity. The distinct petrographic characteristics but similar matrix glass compositions of the T3 and T6 pumice suggest that the extracted melt was physically differentiated during ascent, with the more crystal-poor and volatile-rich T3 melt reaching a higher lever in the magma chamber. Meanwhile, simulation calculations indicate that the melt experienced near-adiabatic decompression-driven chemical differentiation, which led to the growth of sodium-rich plagioclase but not quartz in the pumice.
关键词decompression Iheya North Knoll magma chamber Okinawa Trough physical differentiation pumice
DOI10.1002/gj.3106
收录类别SCI
语种英语
资助项目Qingdao Collaborative Innovation Center of Marine Science and Technology###90; CAS/SAFEA International Partnership Program for Creative Research Teams###89; National High Level Talent Special Support Program###88; Scientific and Technological Innovation Project[2015ASKJ03]###766; Scientific and Technological Innovation Project[2016ASKJ13]###767; Science and Technology Development Program of Shandong Province[2013GRC31502]###53; Innovative Talent Promotion Program[2012RA2191]###52; AoShan Talents Program[2015ASTP-0S17]###768; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061]###47; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030302]###45; National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02]###769; National Natural Science Foundation of China[41325021]###42; National Basic Research Program of China[2013CB429700]###86; Qingdao Collaborative Innovation Center of Marine Science and Technology; CAS/SAFEA International Partnership Program for Creative Research Teams; National High Level Talent Special Support Program; Scientific and Technological Innovation Project[2015ASKJ03]; Scientific and Technological Innovation Project[2016ASKJ13]; Science and Technology Development Program of Shandong Province[2013GRC31502]; Innovative Talent Promotion Program[2012RA2191]; AoShan Talents Program[2015ASTP-0S17]; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030302]; National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02]; National Natural Science Foundation of China[41325021]; National Basic Research Program of China[2013CB429700]
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000450653800019
出版者WILEY
引用统计
被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/156166
专题海洋地质与环境重点实验室
通讯作者Zeng, Zhigang
作者单位1.Chinese Acad Sci, Inst Oceanol, Seafloor Hydrothermal Act Lab, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
第一作者单位中国科学院海洋研究所
通讯作者单位中国科学院海洋研究所
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Zhang, Yuxiang,Zeng, Zhigang,Yin, Xuebo,et al. Petrology and mineralogy of pumice from the Iheya North Knoll, Okinawa Trough: Implications for the differentiation of crystal-poor and volatile-rich melts in the magma chamber[J]. GEOLOGICAL JOURNAL,2018,53(6):2732-2745.
APA Zhang, Yuxiang.,Zeng, Zhigang.,Yin, Xuebo.,Qi, Haiyan.,Chen, Shuai.,...&Chen, Zuxing.(2018).Petrology and mineralogy of pumice from the Iheya North Knoll, Okinawa Trough: Implications for the differentiation of crystal-poor and volatile-rich melts in the magma chamber.GEOLOGICAL JOURNAL,53(6),2732-2745.
MLA Zhang, Yuxiang,et al."Petrology and mineralogy of pumice from the Iheya North Knoll, Okinawa Trough: Implications for the differentiation of crystal-poor and volatile-rich melts in the magma chamber".GEOLOGICAL JOURNAL 53.6(2018):2732-2745.
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