IOCAS-IR  > 海洋地质与环境重点实验室
Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection
Li, Xiaohui1,2; Zeng, Zhigang1,2,3,4; Yang, Huixin1; Yin, Xuebo1; Wang, Xiaoyuan1,3; Chen, Shuai1,3; Ma, Yao1; Guo, Kun1,3,5
2019-05-01
Source PublicationGEOLOGICAL JOURNAL
ISSN0072-1050
Volume54Issue:3Pages:1160-1189
Corresponding AuthorZeng, Zhigang(zgzeng@qdio.ac.cn)
AbstractSilicate melt inclusions (SMIs) in olivine, clinopyroxene, and orthopyroxene in basalt and trachyandesite of the middle Okinawa Trough (MOT) and in basaltic andesites of the southern Okinawa Trough (SOT) were investigated in detail to understand the evolution of magma and geochemical characteristics of the basaltic magma source. Both the SMIs and host bulk rocks are more heavily enriched with Pb and large ion lithophile elements than with high field strength elements and rare earth elements. The major element compositions of SMIs in the MOT trachyandesite show a scattered variation trend of medium-K to shoshonitic series and suggest that a K-rich magma source may exist in the Okinawa Trough. Two groups with distinct element distribution patterns observed in SMIs of the MOT trachyandesite may represent magmas with different evolutionary histories. Compared with fractional crystallization and partial melting processes, magma mixing may serve as a reasonable process for the production of trachyandesite in the MOT. Fractional crystallization has played an important role in basaltic magma evolution in the MOT and SOT. Simulations conducted using MELTS show that the fractional crystallization evolution trends observed correspond well to the presence of a magma chamber at 300MPa with an H2O content level of 0.2wt% in the MOT and to the presence of a magma chamber at 300MPa with an H2O content level of 0.4wt% in the SOT. Ratios of incompatible trace elements (e.g., Th/Ce, Th/Sm, Ba/Th, and Th/Nb); positive Pb anomalies; negative Nb, Ta, and Ti anomalies; and the existence of organic hydrocarbons (CnHm) in the SMIs can be attributed to the involvement of subducted sediment from the subducting slab. Modelling results suggest that more primitive magma represented by SMIs from the MOT has formed through the melting of less than 6% of a metasomatized depleted mantle with contributions of 1.2% sediment melt and 0.8% sediment fluid. In contrast, more primitive magma from the SOT formed through the melting of 4-10% of the depleted mantle with contributions of 3% sediment melt and 1% sediment fluid. The different features of the SMIs together with different tectonic settings of the MOT and SOT have formed in response to the westward subduction of the Philippine Sea Plate.
Keywordbasaltic magma K-rich magma source Okinawa Trough silicate melt inclusions subducted sediment components
DOI10.1002/gj.3217
Indexed BySCI
Language英语
Funding ProjectQingdao National Laboratory for Marine Science and Technology[2015ASTP-0S17] ; Innovative Talent Promotion Program[2012RA2191] ; National Natural Science Foundation of China[41706052] ; National Natural Science Foundation of China[41476044] ; National Natural Science Foundation of China[41325021] ; Science and Technology Development Program of Shandong Province[2013GRC31502] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030302] ; 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 ; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology[MGQNLM-KF201707] ; 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] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; International Partnership Program of Chinese Academy of Sciences[133137KYSB20170003] ; Special Fund for the Global Change and Air-Sea Interaction Project[GASI-GEOGE-02] ; National Key Basic Research Program of China[2013CB429700]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000465392600004
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/337002/161238
Collection海洋地质与环境重点实验室
Corresponding AuthorZeng, Zhigang
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Shandong, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China
4.Qingdao Collaborat Innovat Ctr Marine Sci & Techn, Qingdao, Shandong, Peoples R China
5.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao, Shandong, 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
Li, Xiaohui,Zeng, Zhigang,Yang, Huixin,et al. Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection[J]. GEOLOGICAL JOURNAL,2019,54(3):1160-1189.
APA Li, Xiaohui.,Zeng, Zhigang.,Yang, Huixin.,Yin, Xuebo.,Wang, Xiaoyuan.,...&Guo, Kun.(2019).Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection.GEOLOGICAL JOURNAL,54(3),1160-1189.
MLA Li, Xiaohui,et al."Geochemistry of silicate melt inclusions in middle and southern Okinawa Trough rocks: Implications for petrogenesis and variable subducted sediment component injection".GEOLOGICAL JOURNAL 54.3(2019):1160-1189.
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