IOCAS-IR  > 海洋地质与环境重点实验室
U-Th/He dating and chemical compositions of apatite in the dacite from the southwestern Okinawa Trough: Implications for petrogenesis
Chen, Zuxing1,3; Zeng, Zhigang1,2,3; Wang, Xiaoyuan1,2; Yin, Xuebo1; Chen, Shuai1,2; Guo, Kun1,2,6; Lai, Zhiqing4; Zhang, Yuxiang1,3; Ma, Yao1,2; Qi, Haiyan1; Wu, Lin5
2018-08-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume161Pages:1-13
Corresponding AuthorZeng, Zhigang(zgzeng@ms.qdio.ac.cn)
AbstractApatite has recently gained considerable attention, providing new insight into a wide range of geological processes, such as geochronology, magmatism, metasomatism and metallogenesis. Here, we investigate the U-Th/He dates, in situ major- and trace- element concentrations, and Sr-87/Sr-85 ratios of apatites in the dacite from the southwestern Okinawa Trough to constrain its eruption age and the petrogenesis. The U-Th/He dating of apatites indicates that the volcanic eruption that formed the dacite was no older than 0.28 Ma and that the eruption was related to the replenishment of mafic magma. Apatites are present in the dacite as inclusions within pyroxene phenocrysts and are protected them from the external melt environment; therefore, they should retain a reliable record of their original chemical composition. In addition, all the apatite grains are fluorapatites with F contents of 1.58-2.54 wt.% and Cl contents of 0.57-0.88 wt.%. These grains are enriched in REEs (FREE = 3341-5527 ppm) with significant Eu anomalies (Eu/Eu* = 0,20-0.24), low Sr/Y radios (0.20-0.35), high Sr-87/Sr-86 ratios (range from 0.70635 to 0.70697). Based on these characteristics, we propose that the dehydration of subducted slab released fluids into the overlying mantle wedge and triggered mantle melting, which produced primitive mafic magma with high Cl content. Then, the mafic magma ascended into the crust, which has low Cl concentrations and high Sr-87/Sr-86 ratios. The mixing of a mantle-derived basaltic magma and a crustal felsic magma in a shallow magma chamber diluted the Cl content and elevated the Sr-87/Sr-86 ratio, thus producing the parental magma of the dacite. When the magma chamber was replenished by mafic magma at approximately 0.28 Ma, the high temperature from the injection would have caused the felsic melt to move upward and finally erupt.
KeywordApatite U-Th/He dating Major and trace elements Sr-87/Sr-86 ratios Southwest Okinawa Trough
DOI10.1016/j.jseaes.2018.04.032
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41325021] ; National Natural Science Foundation of China[41476044] ; National Natural Science Foundation of China[41306053] ; National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02] ; National Basic Research Program of China[2013CB429700] ; International Partnership Program of Chinese Academy of Sciences[133137KYSB20170003] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030302] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; National Special Fund for the 13th Five Year Plan of COMRA[DY135-G2-1-02] ; Qingdao National Laboratory for Marine Science and Technology[2015ASTP-0S17] ; Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; Innovative Talent Promotion Program[2012RA2191] ; Science and Technology Development Program of Shandong Province[2013GRC31502] ; National High Level Talent Special Support Program ; 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:000435062400001
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/159413
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 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
4.Minist Educ, Key Lab Submarine Geosci & Prospecting Tech, Qingdao 266100, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 10029, Peoples R China
6.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, 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
Chen, Zuxing,Zeng, Zhigang,Wang, Xiaoyuan,et al. U-Th/He dating and chemical compositions of apatite in the dacite from the southwestern Okinawa Trough: Implications for petrogenesis[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,161:1-13.
APA Chen, Zuxing.,Zeng, Zhigang.,Wang, Xiaoyuan.,Yin, Xuebo.,Chen, Shuai.,...&Wu, Lin.(2018).U-Th/He dating and chemical compositions of apatite in the dacite from the southwestern Okinawa Trough: Implications for petrogenesis.JOURNAL OF ASIAN EARTH SCIENCES,161,1-13.
MLA Chen, Zuxing,et al."U-Th/He dating and chemical compositions of apatite in the dacite from the southwestern Okinawa Trough: Implications for petrogenesis".JOURNAL OF ASIAN EARTH SCIENCES 161(2018):1-13.
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