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dc.contributor.authorRay, D.
dc.contributor.authorKota, D.
dc.contributor.authorDas, P.
dc.contributor.authorSuryaPrakash, L.
dc.contributor.authorKhedekar, V.D.
dc.contributor.authorParopkari, A.L.
dc.contributor.authorMudholkar, A.V.
dc.date.accessioned2014-04-07T08:58:20Z
dc.date.available2014-04-07T08:58:20Z
dc.date.issued2014
dc.identifier.citationActa Geologica Sinica, vol.88(1); 2014; 213-225
dc.identifier.otherno
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/4504
dc.description.abstractAn extinct hydrothermal barite-silica chimney from the Franklin Seamount of the Woodlark Basin, in the southwestern Pacific Ocean, was investigated for mineral distribution and geochemical composition. Six layers on either side of the orifice of a chimney show significant disparity in color, mineral assemblage and major element composition. Electron microscope (SEM) images reveal that the peripheral wall of the chimney is composed of colloform silica, suggesting that incipient precipitation of silica-saturated hydrothermal fluid initiated the development of the chimney wall. Intermediate layers, between the exterior wall and the inner fluid-orifice, dominate with barite and sulfides. Low Sr-to-Ba ratios (SrO/BaO = 0.015–0.017) indicate restricted fluid-seawater mixing, which causes relatively high-temperature formation of the intermediate layers. Whereas the innermost layer bordering the chimney orifice is characterized by more silica and a higher Sr-to-Ba ratio (SrO/BaO = 0.023), could have formed due to a paragenetic shift from a high-temperature active phase to a cooler waning stage of formation. A paragenetic shift is also probably responsible for the change in mineral formation mechanism that resulted in the textural variation of barite and colloform silica developed during different growth phases of this barite-silica chimney.
dc.language.isoen
dc.publisherGeological Society
dc.relation.requiresBioorg_Med_Chem_Lett_24_2863.jpg
dc.rightsAn edited version of this paper was published by Geological Society of China. This paper is for R & D purpose and Copyright [2014] Geological Society of China.
dc.subjectmineralogy
dc.subjectoceanography
dc.subjectgeochemistry
dc.subjectseamounts
dc.subjectminerals
dc.subjectgeochemical cycle
dc.titleMicrotexture and distribution of minerals in hydrothermal Barite-Silica chimney from the Franklin seamount, SW Pacific: Constraints on mode of formation.
dc.typeJournal Article


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