NissirosV1, Main, Exploration, bibRecord, 000255

Precipitation of Fe(III) oxyhydroxide deposits from shallow-water hydrothermal fluids in Tutum Bay, Ambitle Island, Papua New Guinea

Identifieur interne : 000255 ( Main/Exploration ); précédent : 000254; suivant : 000256

Precipitation of Fe(III) oxyhydroxide deposits from shallow-water hydrothermal fluids in Tutum Bay, Ambitle Island, Papua New Guinea

Auteurs : Thomas Pichler [Canada] ; Jan Veizer [Canada]

Source :

Chemical Geology [ 0009-2541 ] ; 1999.

RBID : ISTEX:6CC0B97E2577B29A628CDDB1A22B718ED355A7BC

Descripteurs français

Wicri :
- geographic : Papouasie-Nouvelle-Guinée.
- topic : Géochimie, Géologie, Oxyde.

English descriptors

Abstract

Abstract: Previous research on sea floor Fe(III) oxyhydroxide deposits has focused primarily on deep-sea, hydrothermal systems found along volcanically active portions of the mid-ocean ridges and on hydrogenetic deposits formed in deep basins and along continental shelves. There is, however, not much known about their formation in shallow-water settings associated with volcanic islands. The hydrothermal system at Ambitle Island, Papua New Guinea provides an excellent opportunity to study the formation of Fe(III) oxyhydroxides in a shallow-water setting. Precipitation from the hydrothermal solution is caused by mixing with seawater. Based on a 87Sr/86Sr mixing model, the calculated minimum and maximum seawater fractions are approximately 11 and 57%, respectively. Thus, precipitation of Tutum Bay Fe(III) oxyhydroxides takes place at a temperature range between approximately 60 and 93°C. The chemical composition shows low Mn contents (Fe/Mn>600), and elements that are usually enriched in Fe(III) oxyhydroxides, such as Co and V are below crustal abundance and well below their concentrations in island-arc volcanics. Arsenic concentrations, on the other hand, are by two orders of magnitude higher than those in other marine deposits. Rare earth element (REE) concentrations reflect their concentration in the hydrothermal fluids rather than seawater. The crystallinity of the deposits increases with age, as protoferrihydrite is apparently altered to Fe-smectite and hematite, and As-bearing minerals are formed. Contact with seawater, and therefore oxidizing conditions, seems to be the factor increasing the crystallinity.

Url:

https://api.istex.fr/document/6CC0B97E2577B29A628CDDB1A22B718ED355A7BC/fulltext/pdf

DOI: 10.1016/S0009-2541(99)00068-6

Affiliations:

Canada

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Le document en format XML

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<term>Ambitle</term>
<term>Ambitle island</term>
<term>Amorphous nature</term>
<term>Arsenic</term>
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<term>Environmental science</term>
<term>Fe(III) oxyhydroxide</term>
<term>Feni islands</term>
<term>Geochemical exploration</term>
<term>Geochemistry</term>
<term>Geochimica</term>
<term>Geology</term>
<term>Goethite</term>
<term>Good agreement</term>
<term>Hematite</term>
<term>Hydrothermal</term>
<term>Hydrothermal deposits</term>
<term>Hydrothermal fluid</term>
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<term>Hydrothermal system</term>
<term>Hydrous iron oxides</term>
<term>Loihi seamount</term>
<term>Marine geology</term>
<term>Massive layers</term>
<term>Mcmurtry</term>
<term>Metal deposits</term>
<term>Nontronite</term>
<term>Orifice</term>
<term>Other hand</term>
<term>Outer layer</term>
<term>Oxide</term>
<term>Oxidizing conditions</term>
<term>Oxyhydroxide</term>
<term>Oxyhydroxide deposits</term>
<term>Oxyhydroxide precipitation</term>
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<term>Papua New Guinea</term>
<term>Pichler</term>
<term>Precipitation</term>
<term>Protoferrihydrite</term>
<term>Proton probe</term>
<term>Puteanus</term>
<term>Rapid precipitation</term>
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<term>Science letters</term>
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<term>Shallow water</term>
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<term>Deposit</term>
<term>Economic geology</term>
<term>Environmental science</term>
<term>Feni islands</term>
<term>Geochemical exploration</term>
<term>Geochemistry</term>
<term>Geochimica</term>
<term>Geology</term>
<term>Goethite</term>
<term>Good agreement</term>
<term>Hematite</term>
<term>Hydrothermal</term>
<term>Hydrothermal deposits</term>
<term>Hydrothermal fluid</term>
<term>Hydrothermal fluids</term>
<term>Hydrothermal system</term>
<term>Hydrous iron oxides</term>
<term>Loihi seamount</term>
<term>Marine geology</term>
<term>Massive layers</term>
<term>Mcmurtry</term>
<term>Metal deposits</term>
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<front><div type="abstract" xml:lang="en">Abstract: Previous research on sea floor Fe(III) oxyhydroxide deposits has focused primarily on deep-sea, hydrothermal systems found along volcanically active portions of the mid-ocean ridges and on hydrogenetic deposits formed in deep basins and along continental shelves. There is, however, not much known about their formation in shallow-water settings associated with volcanic islands. The hydrothermal system at Ambitle Island, Papua New Guinea provides an excellent opportunity to study the formation of Fe(III) oxyhydroxides in a shallow-water setting. Precipitation from the hydrothermal solution is caused by mixing with seawater. Based on a 87Sr/86Sr mixing model, the calculated minimum and maximum seawater fractions are approximately 11 and 57%, respectively. Thus, precipitation of Tutum Bay Fe(III) oxyhydroxides takes place at a temperature range between approximately 60 and 93°C. The chemical composition shows low Mn contents (Fe/Mn>600), and elements that are usually enriched in Fe(III) oxyhydroxides, such as Co and V are below crustal abundance and well below their concentrations in island-arc volcanics. Arsenic concentrations, on the other hand, are by two orders of magnitude higher than those in other marine deposits. Rare earth element (REE) concentrations reflect their concentration in the hydrothermal fluids rather than seawater. The crystallinity of the deposits increases with age, as protoferrihydrite is apparently altered to Fe-smectite and hematite, and As-bearing minerals are formed. Contact with seawater, and therefore oxidizing conditions, seems to be the factor increasing the crystallinity.</div>
</front>
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Precipitation of Fe(III) oxyhydroxide deposits from shallow-water hydrothermal fluids in Tutum Bay, Ambitle Island, Papua New Guinea

Precipitation of Fe(III) oxyhydroxide deposits from shallow-water hydrothermal fluids in Tutum Bay, Ambitle Island, Papua New Guinea

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri