Biogenic spherical magnetite and coffinite from a sandstone-type uranium deposit in the Dongsheng area

H. Li; C. Cai; K. Li; X. Luo

Biogenic spherical magnetite and coffinite from a sandstone-type uranium deposit in the Dongsheng area

H. Li^*, C. Cai, K. Li, X. Luo

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

Abstract

Spherical magnetite and rod-shaped coffinite have been intergrown with pyrite and calcite cement in the Dongsheng sandstone-type uranium deposits. In order to assess the origin of magnetite and coffinite, the host sandstone has been analyzed for fluid inclusion oil biomarkers, pyrite δ ³⁴S, calcite δ ¹³C and observed under microscope. The results show that fluid inclusion oils are characterized by "UCM" and significant amounts of 25-norhopanes, suggesting biodegradation of the oils. Sulfur in pyrite originated from bacterial sulfate reduction as indicated by low δ ³⁴S values, and calcite cement has petroleum-derived CO ₂. Coprecipitation of biogenic pyrite with calcite cement that has petroleum-derived carbon, suggests that petroleum was likely oxidized by sulfate-reducing bacteria (SRB). SRB could have depleted petroleum and reduced Fe(III) and U(VI) to Fe(II) and U(IV), respectively, by anaerobic respiration, resulting in magnetite and coffinite formation.

Original language	English
Title of host publication	Water-Rock Interaction - Proceedings of the 12th International Symposium on Water-Rock Interaction, WRI-12
Place of Publication	London
Publisher	Taylor & Francis
Pages	881-885
Number of pages	5
Volume	2
ISBN (Print)	9780415451383
Publication status	Published - 2007
Event	12th International Symposium on Water-Rock Interaction, WRI-12 - Kunming, China Duration: 31 Jul 2007 → 4 Aug 2007

Other

Other	12th International Symposium on Water-Rock Interaction, WRI-12
Country/Territory	China
City	Kunming
Period	31/07/07 → 4/08/07

Cite this

@inproceedings{b4aca7cd6eaa4c04bee60c5b84de4aff,

title = "Biogenic spherical magnetite and coffinite from a sandstone-type uranium deposit in the Dongsheng area",

abstract = "Spherical magnetite and rod-shaped coffinite have been intergrown with pyrite and calcite cement in the Dongsheng sandstone-type uranium deposits. In order to assess the origin of magnetite and coffinite, the host sandstone has been analyzed for fluid inclusion oil biomarkers, pyrite δ 34S, calcite δ 13C and observed under microscope. The results show that fluid inclusion oils are characterized by {"}UCM{"} and significant amounts of 25-norhopanes, suggesting biodegradation of the oils. Sulfur in pyrite originated from bacterial sulfate reduction as indicated by low δ 34S values, and calcite cement has petroleum-derived CO 2. Coprecipitation of biogenic pyrite with calcite cement that has petroleum-derived carbon, suggests that petroleum was likely oxidized by sulfate-reducing bacteria (SRB). SRB could have depleted petroleum and reduced Fe(III) and U(VI) to Fe(II) and U(IV), respectively, by anaerobic respiration, resulting in magnetite and coffinite formation.",

author = "H. Li and C. Cai and K. Li and X. Luo",

year = "2007",

language = "English",

isbn = "9780415451383",

volume = "2",

pages = "881--885",

booktitle = "Water-Rock Interaction - Proceedings of the 12th International Symposium on Water-Rock Interaction, WRI-12",

publisher = "Taylor \& Francis",

address = "United Kingdom",

note = "12th International Symposium on Water-Rock Interaction, WRI-12 ; Conference date: 31-07-2007 Through 04-08-2007",

}

Li, H, Cai, C, Li, K & Luo, X 2007, Biogenic spherical magnetite and coffinite from a sandstone-type uranium deposit in the Dongsheng area. in Water-Rock Interaction - Proceedings of the 12th International Symposium on Water-Rock Interaction, WRI-12. vol. 2, Taylor & Francis, London, pp. 881-885, 12th International Symposium on Water-Rock Interaction, WRI-12, Kunming, China, 31/07/07.

Biogenic spherical magnetite and coffinite from a sandstone-type uranium deposit in the Dongsheng area. / Li, H.; Cai, C.; Li, K. et al.
Water-Rock Interaction - Proceedings of the 12th International Symposium on Water-Rock Interaction, WRI-12. Vol. 2 London: Taylor & Francis, 2007. p. 881-885.

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

TY - GEN

T1 - Biogenic spherical magnetite and coffinite from a sandstone-type uranium deposit in the Dongsheng area

AU - Li, H.

AU - Cai, C.

AU - Li, K.

AU - Luo, X.

PY - 2007

Y1 - 2007

N2 - Spherical magnetite and rod-shaped coffinite have been intergrown with pyrite and calcite cement in the Dongsheng sandstone-type uranium deposits. In order to assess the origin of magnetite and coffinite, the host sandstone has been analyzed for fluid inclusion oil biomarkers, pyrite δ 34S, calcite δ 13C and observed under microscope. The results show that fluid inclusion oils are characterized by "UCM" and significant amounts of 25-norhopanes, suggesting biodegradation of the oils. Sulfur in pyrite originated from bacterial sulfate reduction as indicated by low δ 34S values, and calcite cement has petroleum-derived CO 2. Coprecipitation of biogenic pyrite with calcite cement that has petroleum-derived carbon, suggests that petroleum was likely oxidized by sulfate-reducing bacteria (SRB). SRB could have depleted petroleum and reduced Fe(III) and U(VI) to Fe(II) and U(IV), respectively, by anaerobic respiration, resulting in magnetite and coffinite formation.

AB - Spherical magnetite and rod-shaped coffinite have been intergrown with pyrite and calcite cement in the Dongsheng sandstone-type uranium deposits. In order to assess the origin of magnetite and coffinite, the host sandstone has been analyzed for fluid inclusion oil biomarkers, pyrite δ 34S, calcite δ 13C and observed under microscope. The results show that fluid inclusion oils are characterized by "UCM" and significant amounts of 25-norhopanes, suggesting biodegradation of the oils. Sulfur in pyrite originated from bacterial sulfate reduction as indicated by low δ 34S values, and calcite cement has petroleum-derived CO 2. Coprecipitation of biogenic pyrite with calcite cement that has petroleum-derived carbon, suggests that petroleum was likely oxidized by sulfate-reducing bacteria (SRB). SRB could have depleted petroleum and reduced Fe(III) and U(VI) to Fe(II) and U(IV), respectively, by anaerobic respiration, resulting in magnetite and coffinite formation.

UR - https://www.scopus.com/pages/publications/84863257010

M3 - Conference proceeding contribution

AN - SCOPUS:84863257010

SN - 9780415451383

VL - 2

SP - 881

EP - 885

BT - Water-Rock Interaction - Proceedings of the 12th International Symposium on Water-Rock Interaction, WRI-12

PB - Taylor & Francis

CY - London

T2 - 12th International Symposium on Water-Rock Interaction, WRI-12

Y2 - 31 July 2007 through 4 August 2007

ER -

Biogenic spherical magnetite and coffinite from a sandstone-type uranium deposit in the Dongsheng area

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