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Acta Oceanologica Sinica

, Volume 38, Issue 9, pp 59–70 | Cite as

Origin of Cu in the PACMANUS hydrothermal field from the eastern Manus back-arc basin: evidence from mass balance modeling

  • Yao MaEmail author
  • Xiaoyuan Wang
  • Shuai Chen
  • Xuebo Yin
  • Bowen Zhu
  • Kun Guo
  • Zhigang Zeng
Article

Abstract

Hydrothermal precipitates associated with active vents in the eastern Manus Basin, an actively opening back-arc basin in the Bismarck Sea, Papua New Guinea, are among the most Cu-rich on the modern seafloor. The volcanic rocks associated with this mineralization may be insufficiently enriched in Cu to account for the Cu content of the sulfides by simple leaching. The PACMANUS hydrothermal field lies in the eastern portion of the eastern Manus Basin. Mass balance modeling of the PACMANUS hydrothermal system indicates that simple leaching of a stationary reaction zone (0.144 km3) by hydrothermal fluids cannot yield the Cu found in associated sulfide deposits because unacceptably high leaching, transportation and precipitation efficiencies are required to derive the Cu in sulfides by leaching processes. With 100% leaching, transport and precipitating efficiency, 0.166 km3 of volcanic rocks would need to be leached to account for the Cu budget of hydrothermal sulfide deposits. The key requirement for forming metal-rich magmatic fluids is a large amount of metals available to enter the exsolved vapor phase. Magmas generated in the eastern Manus Basin inherently have high fO2 because of metasomatism of the mantle source by oxidized materials from the subducted slab, leading to copper enrichment in the magma chamber. Moreover, the presence of Cu in gas-rich melt inclusi on bubbles in Pual Ridge andesite is evidence that degassing and partitioning of Cu into the magmatic volatile phase has occurred in the eastern Manus Basin. Numerical mass balance modeling indicates that approximately 0.236 Mt Cu was potentially transferred to the hydrothermal system per cubic kilometer magma. Magmatic degassing seems to play a more significant role than leaching.

Key words

back-arc basin mass balance model PACMANUS hydrothermal field source of Cu 

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Notes

Acknowledgements

We are very appreciative towards the anonymous reviewers for their valuable comments on the manuscript revision. We also thank Cushley David for language editing and Zhang Kaidi and Zhang Jie from the Institute of Oceanology, Chinese Academy of Sciences, for valuable advice during the revision.

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Copyright information

© Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yao Ma
    • 1
    • 2
    Email author
  • Xiaoyuan Wang
    • 1
    • 2
  • Shuai Chen
    • 1
    • 2
  • Xuebo Yin
    • 1
  • Bowen Zhu
    • 1
    • 3
  • Kun Guo
    • 1
    • 2
    • 4
  • Zhigang Zeng
    • 1
    • 2
    • 3
  1. 1.Key Laboratory of Marine Geology and Environment, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.Laboratory for Marine Mineral ResourcesPilot National Laboratory for Marine Science and Technology (Qingdao)QingdaoChina
  3. 3.University of Chinese Academy of SciencesBeijingChina
  4. 4.Ocean Science Isotope and Geochronology CenterPilot National Laboratory for Marine Science and Technology (Qingdao)QingdaoChina

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