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An origin of the along-arc compositional variation in the Izu-Bonin arc system

Geoscience Frontiers 2020年第5期11卷 1621-1634页

作者： Kathryn Durkin Paterno R.Castillo Susanne M.Straub Natsue Abe Yoshihiko Tamura Quanshu Yan Scripps Institution of Oceanography UCSD9500 Gilman DriveLa JollaCA92093-0212USA Lamont-Doherty Earth Observatory Columbia Univ.61 US-9WPalisadesNY10964USA Japan Agency for Marine-Earth Science and Technology(JAMSTEC) 2-15 Natsushima-choJapan Key Laboratory of Marine Sedimentary and Environmental Geology The First Institute of OceanographyState Oceanic AdministrationQingdao 266061China

The Izu-Bonin arc system is sediment-poor(~400 m thick with no accretionary prism)and,therefore,the influence of the altered oceanic crust(AOC)is most likely the source of the documented along-arc lava compositional variations,especially in Pb ***-Bonin arc lava geochemistry suggests an influx of subduction component from an indian-type ***,samples drilled from the western Pacific geochemical reference site at Integrated Ocean Drilling Program Site 1149 implies subduction of a Pacific-type *** solve the apparent discrepancy of slab input versus arc output in this arc system,samples of the AOC were dredged from vertical fault scarps of the subducting Pacific Plate along a transect from 27.5°N to 34.50 *** range from tholeiitic to mildly alkalic mid-ocean ridge basalts as well as trachybasalts,basaltic trachyandesites,tephrites,and *** ratios also exhibit a range of values(87Sr/86Sr=0.70282-0.70673,143 Nd/144 Nd=0.512552-0.513174,206Pb/204 Pb=18.43-20.00,207 Pb/204 Pb=15.40-15.67,208Pb/204Pb=37.75-39.55).Our results suggest that there is a geochemical variation in the AOC that is neither completely due to seawater or hydrothermal alteration,nor to petrogenetic ***,this variation is the result of the Pacific-Izanagi Ridge system tapping into a heterogeneous,plume-polluted mantle source during the Mid-Cretaceous volcanic *** observed Pacific-type AOC is not responsible for the indian-type Pb isotopic signature of Izu-Bonin arc *** leads us to propose an alternative scenario where the Izu-Bonin arc lava indian-type Pb isotopic signature originates from slab-derived fluids interacting and adsorbing Pb from an indian-type mantle wedge through zone-refining.

关键词： Izu-Bonin AOC Pb-isotopes indian-type Zone-refining

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