Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 414-424.doi: 10.13278/j.cnki.jjuese.20170127

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Recognition of Subduction Melt and Fluid Component in Lau and Manus Basins: Sr-Nd-Pb Isotope Ratios and Independent Component Analysis

Wu Xichang, Chu Fengyou, Wang Wei, Li Zhenggang, Chen Ling, Bi Dongwei, Wang Jianqiang   

  1. Key Laboratory of Submarine Geoscience/Second Institute of Oceanography, State Oceanic Administration(SOA), Hangzhou 310012, China
  • Received:2018-12-28 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Key Basic Research Program ("973" Program) of China (2013CB429705, 2013CB429701), Natural Science Foundation of Zhejiang Province (LQ17D060005,LQ17D060004) and Scientific Research Fund of the Second Institute of Oceanography, SOA (JG1605,JG1603,JG1410).

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Abstract: The effects of subducted sediments and altered oceanic crust (AOC) on back-arc magmatism were studied using independent component analysis on multi-isotope dataset. Sr-Nd-Pb isotope data of magmatic rocks from Lau and Manus basins, as well as the Pacific and Indian oceanic ridges, were analyzed, and five independent components (ICs) were identified. The negative correlation between IC1 and 87Sr/86Sr and Th/Nb suggests that the IC1 represents the influence of hydrous melt derived from subducted sediments on the sub-arc mantle, and can be used to distinguish back-arc basin from mid-ocean ridge settings. The negative correlation between IC5 and Ba/Th suggests that IC5 may reflect the influence of aqueous fluid derived from the AOC on the sub-arc mantle. Furthermore, the correlation between IC5 and Th/U indicates that the IC5 values may be related to the age of recycled oceanic crust in the mantle. A comparison between the IC1 and IC5 values of Lau and Manus basins shows that the eastern rift (ER) of Manus basin exhibits similar IC5 but lower IC1 relative to that of Lau basin, whereas the manus spreading center (MSC) and extensional transform zone (ETZ) of Manus basin show similar IC1 but higher IC5 compared with that of Lau basin. These differences suggest that the influences of sediment melts are the strongest in the ER, while AOC fluid exerts similar influence on ER and Lau basin, but much less on MSC and ETZ. We believe that the difference in the degree of sediment melt influence may be associated with variable sediment thickness being subducted into the New Britain and Tonga trenches, while the extent of AOC fluid influence is controlled by the distance of back-arc ridges away from the trench.

Key words: independent component analysis, back-arc basin, Sr-Nd-Pb isotope, altered oceanic crust, subducted sediment, Lau basin, Manus basin

CLC Number: 

  • P597
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