全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
地质论评  2007 

内蒙古东胜铀矿床成矿主岩中球状磁铁矿的成因

Keywords: 东胜铀矿床球状自生磁铁矿碳同位素硫同位素烃类包裹体硫酸盐还原菌(SRB)

Full-Text   Cite this paper   Add to My Lib

Abstract:

在东胜砂岩型铀矿床中,发现了球状磁铁矿、黄铁矿和方解石胶结物紧密共生的现象。为分析球状磁铁矿成因,进行了主岩岩石学观察、同位素测试及包裹体烃色谱-质谱分析。结果显示,包裹体石油烃具有“鼓包”,并检测到25-降藿烷系列,说明油气已被生物降解了。黄铁矿硫同位素低达-19.8‰,形成于细菌硫酸盐还原作用;方解石胶结物碳同位素低至-19.7‰,表明部分CO2来自油气的氧化作用。于是,硫酸盐还原细菌有可能厌氧降解了油气,并用厌氧呼吸还原Fe^3+为Fe^2+,形成球状磁铁矿、黄铁矿。这一成因联系,对本区铀矿和油气的勘探可能具有启发意义。

References

[1]  Lovely D R,Roden E E,Phillips E J P,Woodward J C.1993.Enzymatic iron and uranium reduction by sulfate-reducing bacteria.Marine Geology,113:41~53.
[2]  McCabe C,Sassen R,Saffer B.1987.Occurence of secondary magnetite within biodegrade oil.Geology,15:7~10.
[3]  Peters K E,Moldowan J M.1993.The Biomaker Guide--Interpreting Molecular Fossils in Petroleum and Ancient Sediments.Preatice Hall,Inc.
[4]  Sakaguchi T,Grant B J,Matsunaga T.1993.magnetite formation by a sulphate-reducing bacterium.Nature,365:47~49.
[5]  Sakaguchi T,Arakaki A,Matsunaga T.2002.Desulfovibrio magneticus sp.nov.,a novel sulfate-reducing bacterium that produces intracellular single-domain-sized magnetite particles.International Journal of Systematic and Evolutionary Microbiology,52:215~221.
[6]  Saunders D F,Burson K R,Thompson C K.1999.Model for hydrocarbon microseepage and related near-surface alteration.AAPG Bulletin,83:170~185.
[7]  Lovely D R,Stolz J F,Nord G L,Phillips E J P.1987.Anaerobic production magnetite by a dissimilatory iron-reducing microorganism.Nature,330(19):252~254.
[8]  Lovely D R.1990.Magnetite formation during microbial dissimilatory iron reduction.In:Frankel R B and Blakemore R P ed.Iron Biominerals.New York:Plenum Press,151~166.
[9]  刘庆生,张昌达,曲赞,蔡振京.1991.自生磁铁矿与烃的富集及运移之间相互关系的研究.地球科学,16:565~571.
[10]  任战利,张盛,高胜利,崔军平,刘新社.2006.伊盟隆起东胜地区热演化史与多种能源矿产的关系.石油与天然气地质,27(2):189~193.
[11]  Aharon P,Fu B.2000.Microbial sulfate reduction rates and sulfur and oxygen isotope fractionations at oil and gas seeps in deepwater Gulf of Mexico.Geochemical et Cosmochimica Acta 64(2):233~246.
[12]  Blanc P H,Connan J.1992.Origin and occurrence of 25-norhopanes:a statistical study.Organic Geochemistry,18:813~828.
[13]  Cai C F,Worden R H,Wang Q H,Xiang T S,Zhu J Q,Chu X L.2002.Chemical and isotopic evidence for secondary alteration of natural gases in the Hetianhe Field,Bachu Uplift of the Tarim Basin.Organic Geochemistry,33:1415~1427.
[14]  Cai C F,Li H T,Qin M K,Luo X R,Wang F Y,Ou G X.2007a.Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit,NW China.Ore Geology Reviews,(in press,see website).
[15]  Cai C F,Dong H L,Li H T,Xiao X J,Ou G X,Zhang C M.2007b.Mineralogical and geochemical evidence for bacterial uranium mineralization coupled with hydrocarbon oxidation in the Shashagetai deposit,NW China.Chemical Geology,236:167~79.
[16]  Clark I D,Fritz P.1997.Environmental isotopes in hydrogeology.New York:Lewis Publishers,328.
[17]  Elmore R D,Enqel M H,Crwaford L,Nick K,Imbus S,Sofer Z.1987.Evidence for a relationship between hydrocarbon and authigenic magnetite.Nature,325:428~430.
[18]  George S C,Ahmed M,Liu K,Volk H.2004.The analysis of oil trapped during secondary migration.Organic Geochemistry,35:1489~1511.
[19]  Larter S,Wilhelms A,Head I,Koopmans M,Aplin A,DiPrimio R,Zwach C,Erdmann M,Telnaes N.2003.The controls on the composition of biodegraded oils in the deep subsurface-part1:Biodegradation rates in petroleum reservoirs.Organic Geochemistry,34:601~613.
[20]  Sparks N H C,Mann S,Bazylinski D A,Lovely D R,Jannasch H W,Franke R B.1990.Structure and morphology of magnetite anaerobically-produced by a marine magnetotactic bacterium and a dissimilatory iron-reducing bacterium.Earth Planet.Sci.Lett.,98:14~22.
[21]  Volkman J K,Alexander R,Kagi R I,Woodhouse G W.1983.Demethylated hopanes in crude oils and their applications in petroleum geochemistry.Geochimica et Cosmochimica Acta,47:785~794.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133