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Conference Paper: Authigenic and biogenic minerals in volcanic hot springs of Kamchatka, Russia

TitleAuthigenic and biogenic minerals in volcanic hot springs of Kamchatka, Russia
Authors
KeywordsEarth sciences
Geology
Issue Date2010
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca
Citation
Goldschmidt 2010: Earth, Energy, and the Environment, Knoxville, TN., 13–18 June 2010. In Geochimica et Cosmochimica Acta, 2010, v. 74 n. 12 suppl., p. A598 How to Cite?
AbstractThe volcanic hot spring deposits from Kamchatka, Russia were examined by scanning electron microscopy and transmission electron microscopy equipped with energy dispersive spectroscopy. Those hot springs include Burlyashii, Oil pool, Zavarzin, Thermophile and Jen’s vents, which were previously reported for microbial ecology and mineralogy. Opal A spheroids are common in all hot spring sediments with particle size from <20 nm to 50 nm. Euhedral single quartz nanoparticles of 700 nm crystallized from Opal-A can be observed scattered on the surface of anhedral sediments. Anthigenic kaolinite of sharp faces can be observed in all hot springs with Si, Al and O as major compositions and having flaky- and scale-like structures. Iron sulfides are common with a wide spectrum of crystal sizes and morphologies. Small pyritic iron sulfides have octahedral shape with crystal size around 20-80 nm; while pyrite crystals of 200 nm to 500 nm and these >1 μm have cubic structure. The small pyrite crystals are also observed assembled to bigger cubic shapes, showing an ostwald ripening process. There are also spheroid shaped, 1 μm size pyritic aggregates with rough surface which showed a sulfate-reducing bacteria mediated formation of iron-sulfides. Fibrous and tabular gypsum crystals can be observed coexisting with sulfides, indicating local oxidation condition. Euhedral crystals of element sulfur of 30 μm can also be observed. Magnetic minerals are abundant in Jen’s vents, however, no magnetite can be detected, implying the existence of magnetic iron sulfides though thermophilic iron-reducing bacteria were isolated from some springs. Detrital quartz and silicates of larger sizes can be observed in some hot spring, showing water-rock interaction induced corrosion structures. The high abundance of iron sulfide minerals and the high percentage of menaquinones in sinter deposits indicated highly reduced conditions. The common existences of submicro- to nano-meter authigenic minerals, the abundant bacteria filaments, biofilms and diatoms indicate microbial mediation is a significant factor in the mineralization of those minerals in the hot springs.
DescriptionThis journal supplement is the 2010 Goldschmidt Conference Abstracts
Poster Session - 02d: Precambrian sediments as records of early earth tectonics and ocean-atmosphere-biosphere interactions: no. 35 - Open URL: http://goldschmidt.info/2010/program/programViewfa73.html?session=02d#abstract_2602
Oral Session - 15e: Geological preservation of microorganisms Session chaired by Gordon Southam & Neil Banerjee - Open URL: http://goldschmidt.info/2010/program/programView3399.html?session=15e#abstract_2609
Persistent Identifierhttp://hdl.handle.net/10722/128135
ISSN
2014 Impact Factor: 4.331

 

DC FieldValueLanguage
dc.contributor.authorLi, Yen_HK
dc.contributor.authorZhu, Sen_HK
dc.date.accessioned2010-10-31T14:06:58Z-
dc.date.available2010-10-31T14:06:58Z-
dc.date.issued2010en_HK
dc.identifier.citationGoldschmidt 2010: Earth, Energy, and the Environment, Knoxville, TN., 13–18 June 2010. In Geochimica et Cosmochimica Acta, 2010, v. 74 n. 12 suppl., p. A598en_HK
dc.identifier.issn0016-7037en_HK
dc.identifier.urihttp://hdl.handle.net/10722/128135-
dc.descriptionThis journal supplement is the 2010 Goldschmidt Conference Abstracts-
dc.descriptionPoster Session - 02d: Precambrian sediments as records of early earth tectonics and ocean-atmosphere-biosphere interactions: no. 35 - Open URL: http://goldschmidt.info/2010/program/programViewfa73.html?session=02d#abstract_2602-
dc.descriptionOral Session - 15e: Geological preservation of microorganisms Session chaired by Gordon Southam & Neil Banerjee - Open URL: http://goldschmidt.info/2010/program/programView3399.html?session=15e#abstract_2609-
dc.description.abstractThe volcanic hot spring deposits from Kamchatka, Russia were examined by scanning electron microscopy and transmission electron microscopy equipped with energy dispersive spectroscopy. Those hot springs include Burlyashii, Oil pool, Zavarzin, Thermophile and Jen’s vents, which were previously reported for microbial ecology and mineralogy. Opal A spheroids are common in all hot spring sediments with particle size from <20 nm to 50 nm. Euhedral single quartz nanoparticles of 700 nm crystallized from Opal-A can be observed scattered on the surface of anhedral sediments. Anthigenic kaolinite of sharp faces can be observed in all hot springs with Si, Al and O as major compositions and having flaky- and scale-like structures. Iron sulfides are common with a wide spectrum of crystal sizes and morphologies. Small pyritic iron sulfides have octahedral shape with crystal size around 20-80 nm; while pyrite crystals of 200 nm to 500 nm and these >1 μm have cubic structure. The small pyrite crystals are also observed assembled to bigger cubic shapes, showing an ostwald ripening process. There are also spheroid shaped, 1 μm size pyritic aggregates with rough surface which showed a sulfate-reducing bacteria mediated formation of iron-sulfides. Fibrous and tabular gypsum crystals can be observed coexisting with sulfides, indicating local oxidation condition. Euhedral crystals of element sulfur of 30 μm can also be observed. Magnetic minerals are abundant in Jen’s vents, however, no magnetite can be detected, implying the existence of magnetic iron sulfides though thermophilic iron-reducing bacteria were isolated from some springs. Detrital quartz and silicates of larger sizes can be observed in some hot spring, showing water-rock interaction induced corrosion structures. The high abundance of iron sulfide minerals and the high percentage of menaquinones in sinter deposits indicated highly reduced conditions. The common existences of submicro- to nano-meter authigenic minerals, the abundant bacteria filaments, biofilms and diatoms indicate microbial mediation is a significant factor in the mineralization of those minerals in the hot springs.-
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca-
dc.relation.ispartofGeochimica et Cosmochimica Actaen_HK
dc.subjectEarth sciences-
dc.subjectGeology-
dc.titleAuthigenic and biogenic minerals in volcanic hot springs of Kamchatka, Russiaen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailLi, Y: yiliang@hku.hken_HK
dc.identifier.emailZhu, S: syzhu@hku.hken_HK
dc.identifier.authorityLi, Y=rp01354en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1016/j.gca.2010.04.037-
dc.identifier.hkuros176209en_HK
dc.identifier.volume74en_HK
dc.identifier.issue12 suppl.-
dc.identifier.spageA598en_HK
dc.identifier.epageA598-
dc.publisher.placeUnited Kingdom-
dc.description.otherGoldschmidt 2010: Earth, Energy, and the Environment, Knoxville, TN., 13–18 June 2010. In Geochimica et Cosmochimica Acta, 2010, v. 74 n. 12 suppl., p. A598-

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