NissirosV1, Main, Exploration, bibRecord, 000079

Authigenic pyrite framboids in sedimentary facies of the Mount Wawel Formation (Eocene), King George Island, West Antarctica

Identifieur interne : 000079 ( Main/Exploration ); précédent : 000078; suivant : 000080

Authigenic pyrite framboids in sedimentary facies of the Mount Wawel Formation (Eocene), King George Island, West Antarctica

Auteurs : Anna Mozer [Pologne]

Source :

Polish Polar Research [ 0138-0338 ] ; 2010-01-01.

RBID : ISTEX:E642A7C34DC631CDA49946255B2978761328D40E

Descripteurs français

Wicri :
- topic : Antarctique, Soufre.

English descriptors

KwdEn :
- Acta, Admiralty, Anna mozer, Anoxic, Anoxic sulphidic conditions, Antarctic, Antarctica, Authigenic, Authigenic pyrite, Berner, Birkenmajer, Canfield, Chemical geology, Clastic, Clastic rocks, Cosmochimica, Cosmochimica acta, Detritus, Diagenetic, Dragon, Dragon glacier, Eocene, Facies, Fildes peninsula, Framboid, Framboidal, Framboidal pyrite, Framboids, Geochimica, Glacier, Hennequin, Hydrogen sulphide, Iron monosulphides, Isotope, Isotopic composition, King George Island, King george island, Loose blocks, Marginal moraines, Marine sediments, Microcrystals, Monosulphides, Moraine, Mozer, Organic matter, Planetary science letters, Plant detritus, Point hennequin group, Polyframboidal aggregates, Poole, Pyrite, Pyrite formation, Pyrite framboids, Pyritic, Sediment, Sedimentary, Sedimentary environments, Sedimentary facies, Shetland, Shetland islands, Studia geologica polonica, Sulfur, Sulphate, Sulphide, Sulphur, Thin sections, Wanda, Warszawa, Wawel, Wawel formation, West antarctica, Zastawniak, bacterial sulphate reduction, framboidal pyrite, sulphur isotopes.
Teeft :
- Acta, Admiralty, Anna mozer, Anoxic, Anoxic sulphidic conditions, Antarctic, Antarctica, Authigenic, Authigenic pyrite, Berner, Birkenmajer, Canfield, Chemical geology, Clastic, Clastic rocks, Cosmochimica, Cosmochimica acta, Detritus, Diagenetic, Dragon, Dragon glacier, Eocene, Facies, Fildes peninsula, Framboid, Framboidal, Framboidal pyrite, Framboids, Geochimica, Glacier, Hennequin, Hydrogen sulphide, Iron monosulphides, Isotope, Isotopic composition, King george island, Loose blocks, Marginal moraines, Marine sediments, Microcrystals, Monosulphides, Moraine, Mozer, Organic matter, Planetary science letters, Plant detritus, Point hennequin group, Polyframboidal aggregates, Poole, Pyrite, Pyrite formation, Pyrite framboids, Pyritic, Sediment, Sedimentary, Sedimentary environments, Sedimentary facies, Shetland, Shetland islands, Studia geologica polonica, Sulfur, Sulphate, Sulphide, Sulphur, Thin sections, Wanda, Warszawa, Wawel, Wawel formation, West antarctica, Zastawniak.

Abstract

Pyrite framboids occur in loose blocks of plant-bearing clastic rocks related to volcano-sedimentary succession of the Mount Wawel Formation (Eocene) in the Dragon and Wanda glaciers area at Admiralty Bay, King George Island, West Antarctica. They were investigated by means of optical and scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and isotopic analysis of pyritic sulphur. The results suggest that the pyrite formed as a result of production of hydrogen sulphide by sulphate reducing bacteria in near surface sedimentary environments. Strongly negative Δ34SVCDT values of pyrite (-30 - -25 ‰) support its bacterial origin. Perfect shapes of framboids resulted from their growth in the open pore space of clastic sediments. The abundance of framboids at certain sedimentary levels and the lack or negligible content of euhedral pyrite suggest pulses of high supersaturation with respect to iron monosulphides. The dominance of framboids of small sizes (8-16 μm) and their homogeneous distribution at these levels point to recurrent development of a laterally continuous anoxic sulphidic zone below the sediment surface. Sedimentary environments of the Mount Wawel Formation developed on islands of the young magmatic arc in the northern Antarctic Peninsula region. They embraced stagnant and flowing water masses and swamps located in valleys, depressions, and coastal areas that were covered by dense vegetation. Extensive deposition and diagenesis of plant detritus in these environments promoted anoxic conditions in the sediments, and a supply of marine and/or volcanogenic sulphate enabled its bacterial reduction, precipitation of iron monosulphides, and their transformation to pyrite framboids.

Url:

https://api.istex.fr/document/E642A7C34DC631CDA49946255B2978761328D40E/fulltext/pdf

DOI: 10.2478/v10183-010-0004-2

Affiliations:

Pologne

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

to stream Istex, to step Corpus: 000331
to stream Istex, to step Curation: 000331
to stream Istex, to step Checkpoint: 000044
to stream Main, to step Merge: 000079
to stream Main, to step Curation: 000079

Le document en format XML

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<term>Admiralty</term>
<term>Anna mozer</term>
<term>Anoxic</term>
<term>Anoxic sulphidic conditions</term>
<term>Antarctic</term>
<term>Antarctica</term>
<term>Authigenic</term>
<term>Authigenic pyrite</term>
<term>Berner</term>
<term>Birkenmajer</term>
<term>Canfield</term>
<term>Chemical geology</term>
<term>Clastic</term>
<term>Clastic rocks</term>
<term>Cosmochimica</term>
<term>Cosmochimica acta</term>
<term>Detritus</term>
<term>Diagenetic</term>
<term>Dragon</term>
<term>Dragon glacier</term>
<term>Eocene</term>
<term>Facies</term>
<term>Fildes peninsula</term>
<term>Framboid</term>
<term>Framboidal</term>
<term>Framboidal pyrite</term>
<term>Framboids</term>
<term>Geochimica</term>
<term>Glacier</term>
<term>Hennequin</term>
<term>Hydrogen sulphide</term>
<term>Iron monosulphides</term>
<term>Isotope</term>
<term>Isotopic composition</term>
<term>King George Island</term>
<term>King george island</term>
<term>Loose blocks</term>
<term>Marginal moraines</term>
<term>Marine sediments</term>
<term>Microcrystals</term>
<term>Monosulphides</term>
<term>Moraine</term>
<term>Mozer</term>
<term>Organic matter</term>
<term>Planetary science letters</term>
<term>Plant detritus</term>
<term>Point hennequin group</term>
<term>Polyframboidal aggregates</term>
<term>Poole</term>
<term>Pyrite</term>
<term>Pyrite formation</term>
<term>Pyrite framboids</term>
<term>Pyritic</term>
<term>Sediment</term>
<term>Sedimentary</term>
<term>Sedimentary environments</term>
<term>Sedimentary facies</term>
<term>Shetland</term>
<term>Shetland islands</term>
<term>Studia geologica polonica</term>
<term>Sulfur</term>
<term>Sulphate</term>
<term>Sulphide</term>
<term>Sulphur</term>
<term>Thin sections</term>
<term>Wanda</term>
<term>Warszawa</term>
<term>Wawel</term>
<term>Wawel formation</term>
<term>West antarctica</term>
<term>Zastawniak</term>
<term>bacterial sulphate reduction</term>
<term>framboidal pyrite</term>
<term>sulphur isotopes</term>
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<term>Admiralty</term>
<term>Anna mozer</term>
<term>Anoxic</term>
<term>Anoxic sulphidic conditions</term>
<term>Antarctic</term>
<term>Antarctica</term>
<term>Authigenic</term>
<term>Authigenic pyrite</term>
<term>Berner</term>
<term>Birkenmajer</term>
<term>Canfield</term>
<term>Chemical geology</term>
<term>Clastic</term>
<term>Clastic rocks</term>
<term>Cosmochimica</term>
<term>Cosmochimica acta</term>
<term>Detritus</term>
<term>Diagenetic</term>
<term>Dragon</term>
<term>Dragon glacier</term>
<term>Eocene</term>
<term>Facies</term>
<term>Fildes peninsula</term>
<term>Framboid</term>
<term>Framboidal</term>
<term>Framboidal pyrite</term>
<term>Framboids</term>
<term>Geochimica</term>
<term>Glacier</term>
<term>Hennequin</term>
<term>Hydrogen sulphide</term>
<term>Iron monosulphides</term>
<term>Isotope</term>
<term>Isotopic composition</term>
<term>King george island</term>
<term>Loose blocks</term>
<term>Marginal moraines</term>
<term>Marine sediments</term>
<term>Microcrystals</term>
<term>Monosulphides</term>
<term>Moraine</term>
<term>Mozer</term>
<term>Organic matter</term>
<term>Planetary science letters</term>
<term>Plant detritus</term>
<term>Point hennequin group</term>
<term>Polyframboidal aggregates</term>
<term>Poole</term>
<term>Pyrite</term>
<term>Pyrite formation</term>
<term>Pyrite framboids</term>
<term>Pyritic</term>
<term>Sediment</term>
<term>Sedimentary</term>
<term>Sedimentary environments</term>
<term>Sedimentary facies</term>
<term>Shetland</term>
<term>Shetland islands</term>
<term>Studia geologica polonica</term>
<term>Sulfur</term>
<term>Sulphate</term>
<term>Sulphide</term>
<term>Sulphur</term>
<term>Thin sections</term>
<term>Wanda</term>
<term>Warszawa</term>
<term>Wawel</term>
<term>Wawel formation</term>
<term>West antarctica</term>
<term>Zastawniak</term>
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<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Antarctique</term>
<term>Soufre</term>
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<front><div type="abstract" xml:lang="en">Pyrite framboids occur in loose blocks of plant-bearing clastic rocks related to volcano-sedimentary succession of the Mount Wawel Formation (Eocene) in the Dragon and Wanda glaciers area at Admiralty Bay, King George Island, West Antarctica. They were investigated by means of optical and scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and isotopic analysis of pyritic sulphur. The results suggest that the pyrite formed as a result of production of hydrogen sulphide by sulphate reducing bacteria in near surface sedimentary environments. Strongly negative Δ34SVCDT values of pyrite (-30 - -25 ‰) support its bacterial origin. Perfect shapes of framboids resulted from their growth in the open pore space of clastic sediments. The abundance of framboids at certain sedimentary levels and the lack or negligible content of euhedral pyrite suggest pulses of high supersaturation with respect to iron monosulphides. The dominance of framboids of small sizes (8-16 μm) and their homogeneous distribution at these levels point to recurrent development of a laterally continuous anoxic sulphidic zone below the sediment surface. Sedimentary environments of the Mount Wawel Formation developed on islands of the young magmatic arc in the northern Antarctic Peninsula region. They embraced stagnant and flowing water masses and swamps located in valleys, depressions, and coastal areas that were covered by dense vegetation. Extensive deposition and diagenesis of plant detritus in these environments promoted anoxic conditions in the sediments, and a supply of marine and/or volcanogenic sulphate enabled its bacterial reduction, precipitation of iron monosulphides, and their transformation to pyrite framboids.</div>
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Authigenic pyrite framboids in sedimentary facies of the Mount Wawel Formation (Eocene), King George Island, West Antarctica

Authigenic pyrite framboids in sedimentary facies of the Mount Wawel Formation (Eocene), King George Island, West Antarctica

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