等温剩磁获得曲线揭示的西伯利亚黄土磁化率变化机制Isothermal Remanent Magnetization Acquisition Curves Reveal the Magnetic Susceptibility Variations Mechanism of the Siberian Loess
乐志军;陈家胜;刘秀铭;谢振龙;彭超;李培意;
摘要(Abstract):
探索古土壤层磁化率低值的原因,选取Kurtak剖面的20个典型黄土-古土壤样品测量等温剩磁(IRM)获得曲线.基于样品的IRM获得曲线符合累积对数高斯模型,所有样品拟合出3个矫顽力组分.组分1 (<30 m T)是成壤组分,组分2 (60~100 m T)是碎屑组分,组分3 (>100 m T)是赤铁矿或针铁矿;组分2是Kurtak黄土的主要磁性矿物,其含量变化受控于风速变化. CBD处理后所有样品只拟合出组分2,且CBD处理前后样品的磁化率值呈正相关性,指示碎屑组分是影响剖面磁化率的主要因素.黄土-古土壤层中都存在针铁矿,但针铁矿的含量不足以影响整个剖面磁化率的变化;而Kurtak黄土中的赤铁矿与针铁矿也可能是在源区生成,表明组分3也能指示源区信号.
关键词(KeyWords): 西伯利亚黄土;IRM;矫顽力组分;磁化率;碎屑组分;CBD方法
基金项目(Foundation): 国家自然科学基金资助项目(U1405231、41772180、41602190)
作者(Authors): 乐志军;陈家胜;刘秀铭;谢振龙;彭超;李培意;
参考文献(References):
- [1]刘东生.黄土与环境[M].北京:科学出版社,1985.
- [2]HELLER F,LIU T S.Magnetostratigraphical dating of loess deposits in China[J].Nature,1982,300(5891):431-433.
- [3]KUKLA G,HELLER F,LIU X M,et al.Pleistocene climates in China dated by magnetic susceptibility[J].Geology,1988,16(9):811-814.
- [4]LIU X M,SHAW J,LIU T S,et al.Magnetic mineralogy of Chinese loess and its significance[J].Geophysical Journal International,1992,108(1):301-308.
- [5]HOVAN S A,REA D K,PISIAS N G,et al.A direct link between the China loess and marineδ18O records:aeolian flux to the North Pacific[J].Nature,1989,340(6231):296-298.
- [6]PETIT J R,MOURNER L,JOUZEL J,et al.Palaeoclimatological and chronological implications of the Vostok coredust record[J].Nature,1990,343(6253):56-58.
- [7]ZHOU L P,OLDFIELD F,WINTLE A G,et al.Partly pedogenic origin of magnetic variations in Chinese loess[J].Nature,1990,346(6286):737-739.
- [8]CHLACHULA J,EVANS M E,RUTTER N W.A magnetic investigation of a late Quaternary loess/palaeosol record in Siberia[J].Geophysical Journal International,1998,132(1):128-132.
- [9]CHLACHULA J.The Siberian loess record and its significance for reconstruction of pleistocene climate change in north-central Asia[J].Quaternary Science Reviews,2003,22(18):1879-1906.
- [10]MATASOVA G,PETROVSK Y'E,JORDANOVA N,et al.Magnetic study of late Pleistocene loess/palaeosol sections from Siberia:palaeoenvironmental implications[J].Geophysical Journal International,2001,147(2):367-380.
- [11]朱日祥,Kazan.西伯利亚南部黄土沉积物的磁学性质[J].科学通报,2000,45(11):1200-1205.
- [12]ZHU R X,MATASOVA G,KAZANSKY A,et al.Rock magnetic record of the last glacial-interglacial cycle from the Kurtak loess section,southern Siberia[J].Geophysical Journal International,2003,152(2):335-343.
- [13]BEGT J E,STONE D B,HAWKINS D B.Paleoclimatic forcing of magnetic susceptibility variations in Alaskan loess during the late Quaternary[J].Geology,1990,18(1):40-43.
- [14]LIU X M,HESSE P,ROLPH T,et al.Properties of magnetic mineralogy of Alaskan loess:evidence for pedogenesis[J].Quaternary International,1999,62(1):93-102.
- [15]刘秀铭,刘东生,夏敦胜,等.中国与西伯利亚黄土磁化率古气候记录-氧化和还原条件下的两种成土模式分析[J].中国科学:地球科学,2007,37(10):1382-1391.
- [16]刘秀铭,夏敦胜,刘东生,等.中国黄土和阿拉斯加黄土磁化率气候记录的两种模式探讨[J].第四纪研究,2007,27(2):210-220.
- [17]DUNLOP D,OZDEN Ozdemir.Rock magnetism[M].Cambridge United Kingdom:Cambridge University Press;1997.
- [18]DUNLOP D J.Magnetism in rocks[J].Journal of Geophysical Research Solid Earth,1995,100(B2):2161-2174.
- [19]DENG C L,SHAW J,LIU Q S,et al.Mineral magnetic variation of the jingbian loess/paleosol sequence in the northern loess plateau of China:implications for quaternary development of asian aridification and cooling[J].Earth&Planetary Science Letters,2006,241(1/2):248-259.
- [20]LIU Q S,BANERJEE S K,JACKSON M J,et al.Inter-profile correlation of the Chinese loess/paleosol sequences during marine oxygen isotope Stage 5 and indications of pedogenesis[J].Quaternary Science Reviews,2005,24(1):195-210.
- [21]邓成龙,刘青松,潘永信,等.中国黄土环境磁学[J].第四纪研究,2007,27(2):193-209.
- [22]ROBERTSON D J,FRANCE D E.Discrimination of remanence-carrying minerals in mixtures,using isothermal remanent magnetisation acquisition curves[J].Physics of the Earth and Planetary Interiors,1994,82(3):223-234.
- [23]KRUIVER P P,DEKKERS M J,HESLOP D.Quantification of magnetic coercivity components by the analysis of acquisition curves of isothermal remanent magnetisation[J].Earth&Planetary Science Letters,2001,189(3/4):269-276.
- [24]KRUIVER P P,PASSIER H F.Coercivity analysis of magnetic phases in sapropel S1 related to variations in redox conditions,including an investigation of the S ratio[J].Geochemistry Geophysics Geosystems,2001,2(12):1525-2027.
- [25]HESLOP D,DEKKERS M J,KRUIVER P P,et al.Analysis of isothermal remanent magnetization acquisition curves using the expectation-maximization algorithm[J].Geophysical Journal of the Royal Astronomical Society,2002,148(1):58-64.
- [26]HESLOP D,DILLON M.Unmixing magnetic remanence curves without a priori knowledge[J].Geophysical Journal International,2007,170(2):556-566.
- [27]SPASSOV S,HELLER F,KRETZSCHMAR R,et al.Detrital and pedogenic magnetic mineral phases in the loess/palaeosol sequence at Lingtai(Central Chinese Loess Plateau)[J].Physics of the Earth&Planetary Interiors,2003,140(4):255-275.
- [28]HU P X,LIU Q S,TORRENT J,et al.Characterizing and quantifying iron oxides in Chinese loess/paleosols:Implications for pedogenesis[J].Earth&Planetary Science Letters,2013,369/370(3):271-283.
- [29]NIE J S,ZHANG R,NECULA C,et al.Late Miocene-early Pleistocene paleoclimate history of the Chinese Loess Plateau revealed by remanence unmixing[J].Geophysical Research Letters,2014,41(6):2163-2168.
- [30]JUST J,DEKKERS MJ,DOBENECK T,et al.Signatures and significance of aeolian,fluvial,bacterial and diagenetic magnetic mineral fractions in late Quaternary marine sediments off Gambia,NW Africa[J].Geochemistry Geophysics Geosystems,2012,13(9):Q0AO02.
- [31]韩志勇,李徐生,陈英勇,等.矫顽力组分定量分析揭示下蜀黄土磁化率异常降低的原因[J].地球物理学报,2008,51(6):1835-1843.
- [32]HYLAND E G,SHELDON N D,VOO R V D,et al.Anew paleoprecipitation proxy based on soil magnetic properties:implications for expanding paleoclimate reconstructions[J].Geological Society of America Bulletin,2015,127(7):975-981.
- [33]ZANDER A,FRECHEN M,ZYKINA V,et al.Luminescence chronology of the upper Pleistocene loess record at Kurtak in middle Siberia[J].Quaternary Science Reviews,2003,22(10):999-1010.
- [34]HAESAERTS P,CHEKHA V P,DAMBLON F,et al.The loess-palaeosol succession of Kurtak(Yenisei basin,Siberia):a reference record for the Karga Stage(MIS 3)[J].Quaternaire.Revue de l’Association Franaise Pour l’étude du Quaternaire,2005,16(1):3-24.
- [35]MCINTOSH G,ROLPH T C,SHAW J,et al.A detailed record of normal-reversed-polarity transition obtained from a thick loess sequence at Jiuzhoutai,near Lanzhou,China[J].Geophysical Journal International,1996,127(3):651-664.
- [36]邓成龙.陕西交道全新全黄土-黑垆土磁化率的CBD研究[J].地球物理学报,2000,43(4):505-514.
- [37]吕镔,刘秀铭,陈渠,等.CBD方法对天然样品磁性矿物影响[J].地球物理学报,2012,55(9):3077-3087.
- [38]MEHRA O P,JACKSON M L.Iron oxide removal from soils and clays by a dithionite-citrate system buffered with sodium bicarbonate[J].Clays&Clay Minerals,1960,7(1):317-327.
- [39]DUNLOP D,ZDEMIR.Rock magnetism,Fundamentals and Frontiers[M].Oxford:Cambridge University Press,1997:1-573.
- [40]EYRE J K.The application of high resolution IRM acquisition to the discrimination of remanence carriers in Chinese loess[J].Studia Geophysica et Geodaetica,1996,40(3):234-242.
- [41]DEKKERS M J.Magnetic properties of natural goethite-I.grain-size dependence of some low-and high-field related rockmagnetic parameters measured at room temperature[J].Geophysical Journal International,1989,97(2):323-340.
- [42]FRANCE D E,OLDFIELD F.Identifying goethite and hematite from rock magnetic measurements of soils and sediments[J].Journal of Geophysical Research Solid Earth,2000,105(B2):2781-2795.
- [43]MAHER B A,KARLOUKOVSKI V V,MUTCH T J.High-field remanence properties of synthetic and natural submicrometre haematites and goethites:significance for environmental contexts[J].Earth&Planetary Science Letters,2004,226(3/4):491-505.
- [44]ROCHETTE P,MATHP E,ESTEBAN L,et al.Non-saturation of the defect moment of goethite and fine-grained hematite up to 57 Teslas[J].Geophysical Research Letters,2005,32(22):312-329.
- [45]姜兆霞,刘青松.赤铁矿的定量化及其气候意义[J].第四纪研究,2016,36(3):676-689.
- [46]LE Z J,CHEN J S,LIU X M.Identifying pedogenic magnetic minerals in loess from China and Siberia using isothermal remanent magnetization acquisition curves[J].Studia Geophysica et Geodaetica,2019,63(1):147-167.
- [47]LIU Q S,BANERJEE S K,JACKSON M J,et al.An integrated study of the grain-size-dependent magnetic mineralogy of the Chinese loess/paleosol and its environmental significance[J].Journal of Geophysical Research Solid Earth,2003,108(B9):2437.
- [48]CHEN J S,LIU X M,KRAVCHINSKY V A,et al.Post-depositional forcing of magnetic susceptibility variations at Kurtak section,Siberia[J].Quaternary International,2015,42(4):1067-1070.
- [49]石采东,朱日祥.铁硫化物在古地磁学和环境学中的应用[J].地球物理学进展,2000,15(3):91-97.
- [50]SCHWERTMANN U.The Influence of Silicate on the Transformation of Lepidocrocite to Goethite[J].Clays&Clay Minerals,1972,20(3):159-164.
- [51]SONG S,LU S,LOPEZ-VALDIVIESO A.Magnetic separation of hematite and limonite fines as hydrophobic flocs from iron ores[J].Minerals Engineering,2002,15(6):415-422.