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Microtexture and distribution of minerals in hydrothermal Barite-Silica chimney from the Franklin seamount, SW Pacific: Constraints on mode of formation.

DRS at CSIR-National Institute of Oceanography

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Title Microtexture and distribution of minerals in hydrothermal Barite-Silica chimney from the Franklin seamount, SW Pacific: Constraints on mode of formation.
 
Creator Ray, D.
Kota, D.
Das, P.
SuryaPrakash, L.
Khedekar, V.D.
Paropkari, A.L.
Mudholkar, A.V.
 
Subject mineralogy
oceanography
geochemistry
seamounts
minerals
geochemical cycle
 
Description An 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.
 
Date 2014-04-07T08:58:20Z
2014-04-07T08:58:20Z
2014
 
Type Journal Article
 
Identifier Acta Geologica Sinica, vol.88(1); 2014; 213-225
no
http://drs.nio.org/drs/handle/2264/4504
 
Language en
 
Relation Bioorg_Med_Chem_Lett_24_2863.jpg
 
Rights An 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.
 
Publisher Geological Society