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地质论评  2007 

黔中白云岩风化剖面淋溶实验及其元素地球化学特征

Keywords: 化学淋滤,REE,微量元素,活化和分异,风化剖面,白云岩

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Abstract:

本文通过化学淋溶方法对分布在黔中白云岩风化剖面――平坝剖面进行研究,较系统地分析了原样、酸溶(AS)和酸不溶相(AI)中主量、微量和稀土元素(REE)的地球化学过程和分布分配特征。结果显示:主量元素在酸不溶相中其化学成分和原样非常接近,只是相对含量有所变化;微量元素在酸溶相(AS)中的分配率差别很大,在0~73.22%之间波动,其中Ga、Y、Ba、Pb、U的分配率均在30%以上;尤其值得我们注意的是Y和Zr的淋失量分别达到了59.64%和0.34%,这与传统所认为的Y和Zr为稳定元素不一致,可能对我们重新认识表生过程中化学元素的活动性及分配分布情况具有重要的指导意义;剖面稀土元素超常富集层的形成主要是由于对白云岩残积的继承和磷酸盐矿物的存在,这与先前所得出的结论基本一致。酸淋溶试验同时也反映出研究区的风化作用实质上是一种天然的酸淋溶作用。最后笔者等对酸溶相(AS)中REE和Sr的主要储库进行了讨论,推测磷酸盐是平坝剖面基岩和土层中酸溶相(AS)中REE的主要储库,而Sr的存在形式是碳酸盐矿物本身。

References

[1]  陈骏,王洪涛,鹿化煜.1996.陕西洛川黄土沉积物中稀土元素及其它微量元素的化学淋滤研究.地质学报,70:61~71.
[2]  季宏兵,欧阳自远,王世杰,等.1999.白云岩风化壳剖面的元素地球化学特征及其对上陆壳平均化学组成的意义--以黔北新蒲剖面为例.中国科学(D辑),29:504~513.
[3]  李景阳,梁风,朱立军,陈桐.2001.碳酸盐岩红土风化剖面的淋滤试验研究--以贵州遵义和平坝剖面为例.中国岩溶,20:167~173.
[4]  李艳丽,孙承兴,王世杰,刘秀明.2004.贵州平坝白云岩风化壳稀土超常富集层中稀土赋存状态的研究.地球化学,33(6):628~633.
[5]  孙承兴,王世杰,季宏兵.2002.碳酸盐岩风化成土过程中REE超常富集及Ce强烈亏损的地球化学机理.地球化学,31(2):119~128.
[6]  王世杰,季宏兵,孙承兴.2001.贵州平坝县白云岩风化壳中稀土元素分布特征之初步研究.地质科学,36(4):474~480.
[7]  徐义刚.1999.上幔橄榄岩粒间组分的微量元素特征及其成因探讨.科学通报,44(15):1670-1675.
[8]  Braun J J,Pagel M,Herbillon A,Rosin C.1993.Mobilization and redistribution of REEs and thorium in a syenitic lateritic profile:A mass balance study.Geochim.Cosmochim.Acta,57:4419~4434.
[9]  Braun J J,Viers J,Dupre B,Polve M,Ndam J,Muller J P.1998.Solid/liquid REE fractionation in the lateritic system of Goyoum,East Cameroon:The implication for the present dynamics of the soil covers of the humid tropical regions.Geochim.Cosmochim.Acta,62:273~299.
[10]  Elderfield H,Hakwesworth G H,Greaves M J.1981.Rare earth elements geochemistry of oceanic ferromanganese nokules and associated sediments.Geochim.Cosmochim.Acta,45:513~528.
[11]  Elderfield H,Sholkovitz E R.1987.Rare earth elements in the pore waters of reducing near shore sediments.Earth Planet.Sci.Lett.,82:280~288.
[12]  Fedo C M,Nesbitt H W,Young G M.1995.Unraveling the effects of potassium metasomatism in sedimentary rocks and paleosols,with implications for paleoweathering conditions and provenance.Geology,23:921~924.
[13]  Gaillardet J,Dupre B,Lourat P,et al.1999.Global silicate weathering and CO2 consumption rates deduced from the chemistry of large rivers.Chemical Geology,159:3~30.
[14]  Goldstein S J,Jacobsen S B.1988.Nd and Sr isotope systematics of river water suspended material:Implications for crustal evolution,Earth Planet.Sci.Lett.,87:249~265.
[15]  Ji Hongbing,Wang Shijie,Ouyang Ziyuan,Zhang Shen,Sun Chenxing,Liu Xiuming,Zhou Dequan.2004a.Geochemistry of red residual underlying dolomites in karst terrains of Yunnan-Guizhou Plateau I.The formation of the Pingba profile.Chemical Geology,203:1~27.
[16]  Ji Hongbing,Wang Shijie,Ouyang Ziyuan,Zhang Shen,Sun Chenxing,Liu Xiuming,Zhou Dequan.2004b.Geochemistry of red residual underlying dolomites in karst terrains of Yunnan-Guizhou Plateau Ⅱ.The mobility of rare earth elements during weathering.Chemical Geology,203:29~50.
[17]  Krauskopf K B,Bird D K.1995.Introduction to Geochemistry.New York:McGraw-Hill.
[18]  Mack L E.1990.Sr as a tracer of diagenesis in Cenozoic sediments of the northern Gulf of Mexico sedimentary basin.Ph.D.Dissertation,University of Texas,Austin,Texas,1~198.
[19]  Nestitt H W.1979.Mobility and fractionation of rare earth elements during weathering of agranodiorite.Nature,279:206~210.
[20]  Taylor S,McLennan S M.1985.The Continental Crust:its composition and evolution.Blackwell Scientific Publication,1~311.
[21]  Tessier A,Campbell P G C,Bisson M.1979.Sequential extraction procedure for the speciation of particulate trace metals.Anal.Chem.,51:844~851.
[22]  Toyoda K,Masuda A.1991.Chemical leaching of pelagic sediments; identification of the carrier of Ce anomaly.Geochem.J.,25:95~119.
[23]  王世杰,季宏兵,欧阳自远,等.1999.碳酸盐岩风化成土作用的初步研究.中国科学(D辑),29:442~449.
[24]  Awwiller D N.1994.Geochronology and mass transfer in Gulf Coast mudrocks (south-central Texas,U.S.A.):Rb-Sr,SmNd and REE systematics,Chemical Geology,116:61~84.
[25]  Banfield J F,Eggleton R A.1989.Apatite replacement and rare earth mobility,fractionation,and fixation during weathering.Clay and Clay Minerals,37:113~127.
[26]  Braun J J,Pagel M,Muller J P,Bilong P,Michard A,Cuillet B.1990.Cerium anomalies in latertic profiles.Geochim.Cosmochim.Acta,54:781~795.

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