IOCAS-IR  > 海洋地质与环境重点实验室
Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes
Fang, Xue1,2; Zeng, Zhigang1,2,3,4; Hu, Siyi1,2; Li, Xiaohui1; Chen, Zuxing1; Chen, Shuai1; Zhu, Bowen1,2
2019-12-01
Source PublicationJOURNAL OF MARINE SCIENCE AND ENGINEERING
Volume7Issue:12Pages:22
Corresponding AuthorZeng, Zhigang(zgzeng@ms.qdio.ac.cn)
AbstractFrequent volcanic activity has occurred in the Okinawa Trough (OT) during the late Quaternary, which attracted much attention to the origin of volcanic rocks. Pumice collected from the seafloor has been extensively investigated, whereas few studies paid attention to the pumice in the sediment. The geochemical compositions of pumice preserved in sediments generally provide insight into past volcanic activity and regional magmatism. Here, we present major and trace element compositions and Sr-Nd-Pb isotope data, together with the established age framework for pumice samples recovered from sediment core S9 in the middle OT (MOT) to investigate their possible formation. Compositionally, the S9 pumice samples are dacite and are characterized by relatively higher Sr (Sr-87/Sr-86 = 0.70480-0.70502) and Pb (Pb-206/Pb-204 = 18.321-18.436, Pb-207/Pb-204 = 15.622-15.624, and Pb-208/Pb-204 = 38.52-38.63) and lower Nd (Nd-143/Nd-144 = 0.51272-0.51274) isotope compositions than basalts from the MOT. The geochemical compositions of pumice clasts from different layers of core S9 display no temporal variation trends and vary within narrow ranges. On the basis of the geochemical characteristics of S9 pumice samples, we infer that the parent magma of these samples might generate from hybrid magma through an extensive fractional crystallization process. The Indian Ocean MORB-type mantle was first metasomatized by the subducted Philippine Sea sediments to form the primitive magma; then, followed by assimilation of a small amount of lower crustal component occurred in the lower crust. The long-term magmatism and relatively consistent isotopic compositions indicate that a magma chamber might have existed in the lower crust of the MOT between 11.22 and 12.96 cal. ka BP.
Keywordpumice in sediments Sr-Nd-Pb isotope hybrid magma fractionation crystallization origin of pumice middle Okinawa Trough
DOI10.3390/jmse7120462
Indexed BySCI
Language英语
Funding ProjectNational Programme on Global Change and Air-Sea interaction[GASI-GEOGE-02] ; International Partnership Program of Chinese Academy of Sciences[133137KYSB20170003] ; National Special Fund for the 13th Five Year Plan of COMRA[DYI35-G2-01-02] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; National Basic Research Program of China[2013CB429700] ; National Natural Science Foundation of China[91958213] ; National Natural Science Foundation of China[41325021] ; AoShan Talents Program - Qingdao National Laboratory for Marine Science and Technology[2015ASTP-0S17] ; Innovative Talent Promotion Program[2012RA2191] ; Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13]
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000506654700042
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/164467
Collection海洋地质与环境重点实验室
Corresponding AuthorZeng, Zhigang
Affiliation1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
4.Chinese Acad Sci, Ctr Ocean Mega Sci, 7 Nanhai Rd, Qingdao 266071, 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
Fang, Xue,Zeng, Zhigang,Hu, Siyi,et al. Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes[J]. JOURNAL OF MARINE SCIENCE AND ENGINEERING,2019,7(12):22.
APA Fang, Xue.,Zeng, Zhigang.,Hu, Siyi.,Li, Xiaohui.,Chen, Zuxing.,...&Zhu, Bowen.(2019).Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes.JOURNAL OF MARINE SCIENCE AND ENGINEERING,7(12),22.
MLA Fang, Xue,et al."Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes".JOURNAL OF MARINE SCIENCE AND ENGINEERING 7.12(2019):22.
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