Show simple item record

dc.contributor.authorRay, D.
dc.contributor.authorBanerjee, R.
dc.contributor.authorBalakrishnan, S.
dc.contributor.authorParopkari, A.L.
dc.contributor.authorMukhopadhyay, S.
dc.date.accessioned18/2/2019
dc.date.accessioned2019-02-18T20:16:35Z
dc.date.available31/7/2017
dc.date.available2019-02-18T20:16:35Z
dc.date.issued2017
dc.identifier.citationInternational Journal of Earth Sciences, vol.106(5); 2017; 1723-1733
dc.identifier.issn1437-3262
dc.identifier.urihttps://doi.org/10.1007/s00531-016-1381-5
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/7920
dc.description.abstractIsotopic ratios of strontium and sulfur in six layers across a horizontal section of a hydrothermal barite-silica chimney from Franklin Seamount of western Woodlark Basin have been investigated. Sr-isotopic ratios in barite samples (87Sr/86Sr = 0.70478-0.70493) are less radiogenic than seawater (87Sr/86Sr = 0.70917) indicating that substantial leaching of sub-seafloor magma was involved in the genesis of hydrothermal fluid. The SO2 of magma likely contributed a considerable amount of lighter S-isotope in fluid and responsible for the formation of barite, which is isotopically lighter (34S = 19.4-20.5 �) than modern seawater (34S ~ 21 �). The systematic changes in isotopic compositions across the chimney wall suggest temporal changes in the mode of mineral formation during the growth of the chimney. Enrichment of heavy S- and Sr-isotopes (34S = 20.58 �; 87Sr/86Sr = 0.70493) in the outermost periphery of the chimney indicates that, at the initial stage of chimney development, there was a significant contribution of seawater sulfate during barite mineralization. Thereafter, thickening of chimney wall occurred due to precipitation of fluid carrying more magmatic components relative to seawater. This led to a gradual enrichment of lighter isotopes (34S = 20.42-19.48 �; 87Sr/86Sr = 0.70491-0.704787) toward the inner portion of the chimney wall. In contrast, the innermost layer surrounding the fluid conduit is characterized by heavier and more radiogenic isotopes (34S = 20.3 �; 87Sr/86Sr = 0.7049). This suggests there was increasing influence of percolating seawater on the mineral paragenesis at the waning phase of the chimney development.
dc.languageen
dc.publisherSpringer Berlin Heidelberg
dc.relation.isreferencedbySCI
dc.titleS- and Sr-isotopic compositions in barite-silica chimney from the Franklin Seamount, Woodlark Basin, Papua New Guinea: constraints on genesis and temporal variability of hydrothermal fluid
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record