Mineralogical and geochemical variation in hydrothermal sulfides from Vienna Woods field, Manus Basin, Papua New Guinea: constraints on their evolution
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Polymetallic sulfides from two hydrothermal chimneys and talus deposit from the Vienna Woods field of Manus Basin were studied for mineralogy, elemental composition, and S-isotope ratio to understand their evolution. The factors including the nature of source fluid, mineral paragenesis, and related geochemical processes have been discussed. Mineralogy and elemental concentration of Cu and Fe-rich large chimney at the central part of this hydrothermal field was completely different from the smaller Zn-rich peripheral chimney and Fe-rich talus deposit, suggesting the variable degree of alterations generate physico-chemically different source fluids responsible for these hydrothermal structures. Similarly, S-isotope ratios also indicate chemically diverse fluids and different modes of precipitation were involved in their evolution. Distinct mineral zonings and associated elemental and isotopic compositions within individual deposit confirm paragenetic shifts were involved during their growth process.
KeywordsManus Basin hydrothermal chimney talus geochemistry mineralogy
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The authors are thankful to the Director, CSIR-National Institute of Oceanography, Goa for his encouragement. Paropkari is highly grateful to the Chief Scientist Alexander P Lizitsyn for inviting him to participate in the cruises of R/V Akademik Mstislav Keldysh and providing the samples to undertake scientific investigations. Authors are grateful to Girish Prabhu and Arif Sardar for XRD and SEM-EDS analyses respectively. Thanks to Dash J K Pondicherry University for ICP-MS analysis. This paper benefited from the comments made by two anonymous reviewers. S. Mukhopadhyay acknowledges the financial support from DSTPURSE (Phase-II) of Jadavpur University.
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