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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
Source PublicationGEOLOGICAL JOURNAL
ISSN0072-1050
Volume53Issue:6Pages:2732-2745
Corresponding AuthorZeng, Zhigang(zgzeng@qdio.ac.cn)
AbstractThe 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.
Keyworddecompression Iheya North Knoll magma chamber Okinawa Trough physical differentiation pumice
DOI10.1002/gj.3106
Indexed BySCI
Language英语
Funding ProjectQingdao 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 Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000450653800019
PublisherWILEY
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/156167
Collection海洋地质与环境重点实验室
Corresponding AuthorZeng, Zhigang
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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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