内蒙古中南部出露地壳元素丰度值的估算
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摘要
运用区域大规模采样方法,对内蒙古中南部地区所采样品进行元素丰度值加权计算,这是建立区域地壳模型的基础工作之一,同时也为化探异常的检出提供较为准确的背景值。研究区涉及内蒙古地轴和内蒙古中部造山系2个构造单元。采用加权求平均值的方法,得到内蒙古中南部出露地壳10种常量元素氧化物和40种微量元素的丰度值。经地表热流值、地震平均波速和元素比值方法检验后证明所得结果合理。计算所得内蒙古中南部出露地壳平均成分为花岗闪长质,与目前一般认为的结论相同。将结果与其他地区进行比较分析后可知,内蒙古中南部出露的地壳与全球上地壳的组成基本一致。由微量元素、稀土元素的图解和内蒙古中南部出露地壳的元素丰度与中国东部出露地壳元素丰度的对比可以看出,整体上,内蒙古中南部具有较强的壳内分异作用和地壳增生作用(地幔物质加入)。
Elemental abundance values estimation of the exposed crust in southern-central Inner Mongolia by means of large-scale sampling in the region, is a basic work for model establishment of the crustal composition.It can also provide the background values for geochemical exploration.The study area includes two tectonic units, respectively northern margin of Inner Mongolia Axis and the Central Inner Mongolia Orogenic Belt.Trough weighted values method, we've estimated elemental values of 10 major elements and 40 trace elements.The estimated values are proved reasonable by surface heat flow value, and average seismic wave velocity and elements ratios.The estimated average chemical composition of the exposed crust of Inner Mongolia belongs to granodioritic, which is agreed by most researchers.Through comparison with global average composition, the exposed crustal elemental abundance values of Inner Mongolia are similar to the average values.From the diagrams of trace and rare earth elements and comparison with the elemental abundance values of eastern China, we conclude that there is strong crust differentiation and accretion of the whole southern-central Inner Mongolia.
Elemental abundance values estimation of the exposed crust in southern-central Inner Mongolia by means of large-scale sampling in the region, is a basic work for model establishment of the crustal composition.It can also provide the background values for geochemical exploration.The study area includes two tectonic units, respectively northern margin of Inner Mongolia Axis and the Central Inner Mongolia Orogenic Belt.Trough weighted values method, we've estimated elemental values of 10 major elements and 40 trace elements.The estimated values are proved reasonable by surface heat flow value, and average seismic wave velocity and elements ratios.The estimated average chemical composition of the exposed crust of Inner Mongolia belongs to granodioritic, which is agreed by most researchers.Through comparison with global average composition, the exposed crustal elemental abundance values of Inner Mongolia are similar to the average values.From the diagrams of trace and rare earth elements and comparison with the elemental abundance values of eastern China, we conclude that there is strong crust differentiation and accretion of the whole southern-central Inner Mongolia.
引文
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[22]汪洋,汪集,邓晋福,等.对中国大陆壳体的放热性生热元素丰度的大地热流检验[J].大地构造与成矿学,2001,25(2):210-216.
[23]Rybach L.Determination of heat production rate[M]//Haenel R.Ry-bach L,Stegena L.Handbook of Terrestrial Heat-flow Density De-termination.Kluwer,1988:125-142.
[24]孙武城,等(国家地震地学断面编委会).湖北随州至内蒙古喀拉沁旗地学断面[M].北京:地震出版社,1992:1-65.
[25]马杏垣,刘昌铨,刘国栋(国家地震地学断面编委会).江苏响水至内蒙古满都拉地学断面[M].北京:地质出版社,1991:1-68.
[26]卢造勋,夏怀宽(国家地震地学断面编委会).内蒙古东乌珠穆沁旗至辽宁东沟地学断面[M].北京:地震出版社,1992:1-67.
[27]Fountain D M,Christensen N I.Composition of the continental crust and upper mantle:A review[C]//Pakiser L C,Mooney W D,Geophysical Framework of the Continental United States.Geol.Soe.Amer.Memoir.,1989,172:711-742.
[28]Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth-Sci.Rev.,1994,37:215-224.
[29]Wood D A,Joron J L,Treuil M,et al.Elemental and Sr isotope variations in basic lavas from Iceland and the surrounding ocean floor[J].Contrib.Minerla.Petrol.,1979,70:319-339.
[30]牟保磊.元素地球化学[M].北京:北京大学出版社,1999:92-96.
①内蒙古自治区地质调查院,中国地质大学(北京).内蒙古自治区区域成矿规律及重要矿产成矿预测地球化学综合研究设计书.2006:9-12.
②邵和明,张履桥.内蒙古自治区主要成矿区(带)和成矿系列.2001:42-56.
[2]Shaw D M,Reilly G A,Muysson J R,et al.An estimate of the chemical composition of the Canadian Precambrian shield[J].Can.J.Earth Sci.,1967,4:829-853.
[3]Shaw D M,Dostal J,Keays R R.Additional estimates of continental surface Precambrian shield composition in Canada[J].Geochim.Cos-mochim.Acta,1976,40:73-83.
[4]Eade K E,Fahrig W F.Chemical Evolutionary Trends of Continental Plates-preliminary Study of the Canadian Shield[J].Geol.Sur.Can.Bull.,1971,179:51.
[5]Eade K E,Fahrig W F.Regional,lithological,and temporal variation in the abundances of some trace elements in the Canadian shield[J].Geol.Sur.Canada Paper.,1973,72-46.
[6]Taylor S R,McLennan S M.The continental crust:Its composition and evolution[M].Blackwell,Oxford,1985:1-312.
[7]Condie K C.Chemical composition and evolution of the upper con-tinental crust:contrasting results form surface samples and shales[J].Chem.Geol.,1993,104:1-37.
[8]Wedepohl H.The composition of the continental crust[J].Geochim.Cosmochim.Acta,1995,59:1217-1239.
[9]Gao S,Luo T C,Zhang B R,et al.Chemical composition of the continental crust as revealed by studies in east China[J].Geochim.Cosmochim.Acta,1998,62:1959-1975.
[10]Rudnick R L,Gao S.Composition of the continental crust[M]//Rudnick R L.The Crust Vol.3.Holland H D,Turekian K K.Treatise on Geochemistry.Elsevier-Pergamon:Oxford,2003:1-64.
[11]Clarke F W.The relative abundance of the chemical elements[J].Phil.Soc.Washington Bull.,1889,XI:131-142.
[12]Clarke F W,Washington H S.The composition of the Earth's crust[J].USGS Professional Paper,1924,127:117.
[13]Shaw D M,Cramer J J,Higgins M D,et al.Composition of the Canadian Precambrian shield and the continental crust of the earth[M]//J B Dawson.D A Carswell.Hall J.et al.The nature of the lower continental crust.London:Geol.Soc.,1986,24:257-282.
[14]Ronov A B,Yaroshevsky A A.Chemical structure of the Earth's crust[J].Geokhimiya,1967,11:1285-1309.
[15]Ronov A B,Yaroshevsky A A.A new model for the chemical structure of the Earth's crust[J].Geokhimiya,1976,12:1761-1795.
[16]鄢明才,迟清华.中国东部地壳与岩石的化学组成[M].北京:科学出版社,1997:1-292.
[17]Goldschmidt V M.Grundlagen der quantitativen Geochemie[J].Fortschr.Mienral.Kirst.Petrogr.,1933,17:112.
[18]黎彤,倪守斌.地球和地壳的化学元素丰度[M].北京:地质出版社,1990:1-136.
[19]内蒙古自治区地质矿产局.内蒙古自治区区域地质志[M].北京:地质出版社,1991:1-725.
[20]内蒙古自治区地质矿产局.内蒙古自治区岩石地层[M].北京:地质出版社,1996:1-344.
[21]内蒙古自治区地层表编写组.华北地区区域地层表·内蒙古分册[M].北京:地质出版社,1978:1-338.
[22]汪洋,汪集,邓晋福,等.对中国大陆壳体的放热性生热元素丰度的大地热流检验[J].大地构造与成矿学,2001,25(2):210-216.
[23]Rybach L.Determination of heat production rate[M]//Haenel R.Ry-bach L,Stegena L.Handbook of Terrestrial Heat-flow Density De-termination.Kluwer,1988:125-142.
[24]孙武城,等(国家地震地学断面编委会).湖北随州至内蒙古喀拉沁旗地学断面[M].北京:地震出版社,1992:1-65.
[25]马杏垣,刘昌铨,刘国栋(国家地震地学断面编委会).江苏响水至内蒙古满都拉地学断面[M].北京:地质出版社,1991:1-68.
[26]卢造勋,夏怀宽(国家地震地学断面编委会).内蒙古东乌珠穆沁旗至辽宁东沟地学断面[M].北京:地震出版社,1992:1-67.
[27]Fountain D M,Christensen N I.Composition of the continental crust and upper mantle:A review[C]//Pakiser L C,Mooney W D,Geophysical Framework of the Continental United States.Geol.Soe.Amer.Memoir.,1989,172:711-742.
[28]Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth-Sci.Rev.,1994,37:215-224.
[29]Wood D A,Joron J L,Treuil M,et al.Elemental and Sr isotope variations in basic lavas from Iceland and the surrounding ocean floor[J].Contrib.Minerla.Petrol.,1979,70:319-339.
[30]牟保磊.元素地球化学[M].北京:北京大学出版社,1999:92-96.
①内蒙古自治区地质调查院,中国地质大学(北京).内蒙古自治区区域成矿规律及重要矿产成矿预测地球化学综合研究设计书.2006:9-12.
②邵和明,张履桥.内蒙古自治区主要成矿区(带)和成矿系列.2001:42-56.
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