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地质学报  2010 

广西新元古代BIF的铁同位素特征及其地质意义

, PP. 1080-1086

Keywords: Fe同位素,条带状含铁建造,富禄组,新元古代,三江地区

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Abstract:

通过分析广西三江地区新元古代条带状含铁建造的Fe同位素和主量元素组成,对海水的氧化还原状态提供了制约,为富禄期的地球处于间冰期提供了证据。相对于标准物质IRMM-014,新元古代含铁建造不同条带全岩样品的δ??57?Fe值变化范围1.60‰~2.20‰,平均值为1.85‰,表明BIF样品富集铁的重同位素。条带状含铁建造主要由Fe?2O?3和SiO?2组成,但却具有较高的Al2O3含量。这表明条带状含铁建造样品不是纯净的化学沉积物,而是具有一定的碎屑物质输入。碎屑输入量的不同引起深色和浅色条带之间铁同位素组成存在着0.4‰的差别。剔除碎屑的影响,新元古代BIF从海水中沉淀的赤铁矿δ??57?Fe的平均值在2‰左右,略高于太古代条带状铁建造的Fe同位素组成,这表明当时海水的氧逸度可能比太古代还低。这说明在富禄期绝大部分海洋仍旧被冰盖覆盖,只在局部出现融化。因此,富禄期的地球可能出于冰期的相对温暖阶段,而不是间冰期。

References

[1]  Paytan A,Sulfate Clues for the Early History of Atmospheric Oxygen,Science,2000.
[2]  Rouxel O,Dobbek N,Ludden J,Iron isotope fractionation during oceanic crust alteration,Chemical Geology,2003.
[3]  Rouxel O J,Bekker A,Edwards K J,Iron isotope constraints on the Archean and Paleoproterozoic Ocean redox state,Science,2005.
[4]  Severmann S,Johnson C M,Beard B L,McManus J,The effect of early diagenesis on the Fe isotope compositions of porewaters and authigenic minerals in continental margin sediments,Geochimica et Cosmochimica Acta,2006.
[5]  Scott C,Lyons T W,Bekker A,Tracing the stepwise oxygenation of the Proterozoic ocean,Nature,2008.
[6]  Sharma M,Polizzotto M,Anbar A D,Iron isotopes in hot springs along the Juan de Fuca Ridge,Earth and Planetary Science Letters,2001.
[7]  Skulan J L,Beard B L,Johnson C M,Kinetic and equilibrium Fe isotope fractionation between aqueous Fe(III) and hematite,Geochim,Cosmochim Acta,2002.
[8]  Staubwasser M,von Blanckenburg F,Schoenberg R,Iron isotopes in the early marine diagenetic iron cycle,Geology,2006(8).
[9]  Staton S J R,Amskold L,Gordon G,Iron isotope fractionation during photo-oxidation of aqueous ferrous iron,2006.
[10]  Tang Suohan,Zhu Xiangkun,Cai Junjun,Chromatographic separation of Cu,Fe and Zn using AG MP21 Anion Exchange resin for isotope determination by MC-ICP-MS,Rock and Mineral Analysis,2006(1).
[11]  Taylor S R,McLennan S M,The continental crust:its composition and evolution,Blackwell:Oxford,1985.
[12]  Tribovillard N,Algeo T J,Lyons T,Riboulleau A,Trace metals as paleoredox and paleoproductivity proxies-An update,Chemical Geology,2006.
[13]  Wang J,Li Z X,History of Neoproterozoic rift basins in South China:Implications for Rodinia break-up,Precambrian Research,2003.
[14]  Whitehouse M.J,Fedo C.M,Microscale heterogeneity of Fe isotopes in 》3.71 Ga banded iron formation from the Isua Greenstone Belt,Southwest Greenland,Geology,2007.
[15]  Zhang Qirui,Li Xianhua,Feng Lianjun,Huang Jing Song Biao,A New Age Constraint on the Onset of the Neoproterozoic Glaciations in the Yangtze Platform,South China,Journal of Geology,2008.
[16]  Zhou C,Tucker R D,Xiao S,New constraints on the ages of Neoproterozoic glaciations in south China,Geology,2004.
[17]  Zhu X K,O\'Nions R K,Guo Y,Isotope homogeneity of iron in the early solar nebula,Nature,2001.
[18]  Zhu X K,Guo Y L,Williams R J P,Mass fractionation processes of transition metal isotopes,Earth and Planetary Science Letters,2002.
[19]  LI Jin,朱祥坤,TANG Suo-han,低温环境下铁同位素分馏的若干重要过程,岩石矿物学杂志,2008(4).
[20]  LI Zhi-hong,朱祥坤,TANG Suo-han,鞍山-本溪地区条带状铁建造的铁同位素与稀土元素特征及其对成矿物质来源的指示,岩石矿物学杂志,2008(4).
[21]  唐索寒,朱祥坤,蔡俊军,用于多接收器等离子体质谱铜、铁、锌同位素测定的离子交换分离方法,岩矿测试,2006.
[22]  张启锐,储雪蕾,扬子地区江口冰期地层的划分对比与南华系层型剖面,地层学杂志,2006(4).
[23]  朱祥坤,LI Zhi-hong,赵新苗,TANG Suo-han,何学贤,Nick S. Belshaw,铁同位素的MC-ICP-MS测定方法与地质标准物质的铁同位素组成,岩石矿物学杂志,2008(4).
[24]  Anbar A D,Knoll A H,Proterozoic Ocean Chemistry and Evolution:A Bioinorganic Bridge,Science,2002(16).
[25]  Anbar A D,Jarzecki A A,Spiro T G,Theoretical investigation of iron isotope fractionation between Fe(H2O)3+6 and Fe(H2O)2+6:implications for iron stable isotope geochemistry,Geochimica et Cosmochimica Acta,2005.
[26]  Balci N,Bullen T D,Witte-Lien K,Iron isotope fractionation during microbially stimulated Fe(II) oxidation and Fe(III) precipitation,Geochimica et Cosmochimica Acta,2006.
[27]  Beard B L,Johnson C M,High-precision iron isotope measurements of terrestrial and lunar materials,Geochimica et Cosmochimica Acta,1999.
[28]  Beard B L,Johnson C M,Skulan J L,Application of Fe isotopes to tracing the geochemical and biological cycling of Fe,Chemical Geology,2003.
[29]  Bekker A,Holland P H,Wang D L,Dating the rise of atmospheric oxygen,Nature,2004.
[30]  Bergquist B A,Boyle E A,Iron isotopes in the Amazon River system:Weathering and transport signatures,Earth and Planetary Science Letters,2006(1-2).
[31]  Bullen T D,White A F,Childs C W,Demonstration of significant abiotic iron isotope fractionation,Geology,2001.
[32]  Canfield D E,Anew model for Proterozoic ocean chemistry,Nature,1998.
[33]  Canfield D E,Habicht K S,Thamdrup B,The Archean Sulfur Cycle and the Early History of Atmospheric Oxygen,Science,2000.
[34]  Canfield D E,The early history of atmospheric oxygen:Homage to Robert M.Garrels,Annual Review of Earth and Planetary Sciences,2005.
[35]  Catling D C,Claire M W,How Earth atmosphere evolved to anoxic state:A status report,Earth and Planetary Science Letters,2005.
[36]  Chu N C,Johnson C M,Beard B L,German C R,Nesbitt R W,Frank M,Evidence for hydrothermal venting in Fe isotope compositions of the deep Pacific Ocean through time,Earth and Planetary Science Letters,2006.
[37]  Croal L R,Johnson C M,Beard B L,Newman D K,Iron isotope fractionation by Fe(II)-oxidizing photoautotrophic bacteria,Geochimica et Cosmochimica Acta,2004.
[38]  Dauphas N,van Zuilen M,Wadhwa M,Clues from Fe isotope variations on the origin of Early Archean BIFs from Greenland,Science,2004.
[39]  Fantle M S,DePaolo D J,Iron isotopic fractionation during continental weathering,Earth and Planetary Science Letters,2004.
[40]  Frost C D,von Blanckenburg F,Schoenberg R,Preservation of Fe isotope heterogeneities during diagenesis and metamorphism of banded iron-formation,Contributions to Mineralogy & Petrology,2007.
[41]  Holland H D,The Chemical Evolution of the Atmosphere and Oceans,Princeton,NJ:Princeton Univer sity Press,1984.
[42]  Hoffman P F,Kaufman A J,Halverson G P,A Neoproterozoic snowball Earth,Science,1998.
[43]  Johnson C M,Skulan J L,Beard B L,Sun H Nealson K H Braterman P S,Isotopic fractionation between Fe(III) and Fe(II) in aqueous solutions,Earth and Planetary Science Letters,2002.
[44]  Johnson C M,Roden E E,Welch S A,Beard B L,Experimental constraints on Fe isotope fractionation during magnetite and Fe carbonate formation coupled to dissimilatory hydrous ferric oxide reduction,Geochimica et Cosmochimica Acta,2005.
[45]  Johnson C M,Beard B L,Klein C,Beukes N J Roden E E,Iron isotopes constrain biologic and abiologic processes in banded iron formation genesis,Geochimica et Cosmochimica Acta,2008.
[46]  Klein C,Some Precambrian banded iron-formations (BIFs) from around the world:Their age,geologic setting,mineralogy,metamorphism,geochemistry,and origin,American Mineralogist,2005.
[47]  Kump L R,The rise of atmospheric oxygen,Nature,2008.
[48]  Levasseur S,Frank M,Hein J R,Halliday A,The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits:implications for seawater chemistry,Earth and Planetary Science Letters,2004.

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