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High-potassium volcanic rocks from the Okinawa Trough: Implications for a cryptic potassium-rich and DUPAL-like source
Zhang, Yuxiang1,3; Zeng, Zhigang1,2,3; Li, Xiaohui1,3; Yin, Xuebo1; Wang, Xiaoyuan1,2; Chen, Shuai1
2018-09-01
Source PublicationGEOLOGICAL JOURNAL
ISSN0072-1050
Volume53Issue:5Pages:1755-1766
Corresponding AuthorZeng, Zhigang(zgzeng@qdio.ac.cn)
AbstractMajor element, trace element, and Sr-Nd-Pb isotopic compositions of high-potassium calc-alkaline rhyolites (the T6 rhyolites) collected from the western slope of the middle Okinawa Trough (MOT) are reported in this article. These high-potassium rhyolites have similar major and trace elemental compositions as Type 2 rhyolites from the MOT, except that the former contain higher concentrations of K2O, Th, U, and Rb and lower concentrations of Sr and Eu. Experimental data indicate that the T6 rhyolites cannot be sourced from low- to mid-potassium MOT rocks by either fractional crystallization or partial melting processes but are instead derived from a cryptic potassium-rich source beneath the Okinawa Trough (OT). Considering that high-potassium volcanic rocks are distributed throughout the East China Sea Shelf, the Ryukyu Arc, and Kyushu Island, the high-potassium OT rocks could represent an important connection between the OT and its adjacent regions. Compared to volcanic rocks from the MOT axial zone, the T6 rhyolites have more depleted Sr-Nd isotopic compositions (Sr-87/Sr-86=0.7035-0.7036, Nd-143/Nd-144=0.51291-0.51297) but much more enriched compositions of Pb-207 (Pb-207/Pb-204=15.60-15.63) and Pb-208 (Pb-208/Pb-204=38.45-38.57), thus recording a significant DUPAL-like signature. These isotopic anomalies cannot be explained by the incorporation of subducting sediments or crustal contamination but instead imply the presence of a DUPAL-like mantle source beneath the OT. The decrease of the DUPAL-like anomaly from the T6 rhyolites to the MOT axial zone volcanic rocks is consistent with the injection of an normal mid-ocean ridge basalt (N-MORB) mantle source, such as asthenospheric material, into pre-existing DUPAL-like mantle during back-arc extension.
KeywordDUPAL-like anomaly high-potassium calc-alkaline Okinawa Trough potassium-rich source rhyolite
DOI10.1002/gj.3000
Indexed BySCI
Language英语
Funding ProjectNational Key Basic Research Program of China[2013CB429700] ; National Natural Science Foundation of China[41325021] ; National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030302] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; Aoshan Talents Program[2015ASTP-0S17] ; Innovative Talent Promotion Program[2012RA2191] ; Science and Technology Development Program of Shandong Province[2013GRC31502] ; Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13] ; Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; CAS/SAFEA International Partnership Program for Creative Research Teams ; Qingdao Collaborative Innovation Center of Marine Science and Technology
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000443563400009
PublisherWILEY
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/160013
Collection中国科学院海洋研究所
Corresponding AuthorZeng, Zhigang
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, 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,Li, Xiaohui,et al. High-potassium volcanic rocks from the Okinawa Trough: Implications for a cryptic potassium-rich and DUPAL-like source[J]. GEOLOGICAL JOURNAL,2018,53(5):1755-1766.
APA Zhang, Yuxiang,Zeng, Zhigang,Li, Xiaohui,Yin, Xuebo,Wang, Xiaoyuan,&Chen, Shuai.(2018).High-potassium volcanic rocks from the Okinawa Trough: Implications for a cryptic potassium-rich and DUPAL-like source.GEOLOGICAL JOURNAL,53(5),1755-1766.
MLA Zhang, Yuxiang,et al."High-potassium volcanic rocks from the Okinawa Trough: Implications for a cryptic potassium-rich and DUPAL-like source".GEOLOGICAL JOURNAL 53.5(2018):1755-1766.
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