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地质通报  2006 

两广云开隆起区基性侵入岩的地球化学特征及其构造意义

, PP. 434-441

Keywords: 云开隆起区加里东期基性侵入岩俯冲-碰撞伸展-拆沉-底侵作用

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Abstract:

云开隆起区信宜、高州一带条带-眼球状(环斑)花岗质岩石中基性侵入岩主要为变苏长辉长岩和变辉长岩,TiO2含量(0.24%-0.53%)和稀土元素总量(18.64-78.30μg/g)较低,轻稀土元素富集(LREE/HREE=2.69~5.28,(La/Yb)N=1.79~4.73),Ta、Nb、P、Zr、Ti为明显负异常,无明显Eu负异常(δEu=0.81-1.16),La/Nb=1.94~5.42,Th/Ta=2.29~17.63,Nb/Th<7.4,εNd(t)=-3.6~-8.4,高Ti/Zr、Ti/Y,低Rb/Ba、La/Yb和EMII,显示富集地幔源区的特征。变苏长辉长岩Sm-Nd岩石-矿物同位素等时线年龄为392Ma±53Ma,表明加里东期的基性侵入岩形成于俯冲-碰撞大陆边缘的火山弧构造背景,而且是俯冲-碰撞后伸展-拆沉-底侵作用阶段的产物。

References

[1]  林庆华,李立源,梁明国.粤西合水、思贺地区花岗质岩石的成因[J].中国区域地质,1990,9(2):173-180.
[2]  叶伯丹.两广云开地区同位素地质年龄数据及其地质意义[J].广东地质,1989,(3):39-56.
[3]  陈斌,黄福生.粤西云炉地区混合岩的成因研究[J].地质学报,1994,68(3):231-239.
[4]  周汉文,游振东,钟增球,等.云开隆起区钾长球斑片麻状黑云母花岗岩锆石特征研究[J].地球科学,1994,(4):427-432.
[5]  Meschede M.A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with Nd-Zr-Y diagram[J].Chem.Geol.,1986,56:207-218.
[6]  Bortolotti V,Marroni M,Nicolae I,et al.An update of the Jurassic ophiolites and associated calc-alkaline rocks in the South Apuseni mountains (Western Romania)[J].Offioliti,2004,29(1):5-18.
[7]  彭松柏,金振民,付建明,等.云开造山带条带-眼球状(环斑)强过铝花岗岩的岩石地球化学、年代及成因[J].科学技术与工程,2005,5(17):1238-1245.
[8]  周汉文,游振东,钟增球,等.粤西云开前寒武纪基底麻粒岩、紫苏花岗岩放射性元素分布特征与岩石成因讨论[J].地球科学,1996,(5):529-534.
[9]  Kay R W,Kay S M.Delamination and delamination magmatism[J].Tectonophysics,1993,219:177-189.
[10]  Kay S M.Young mafic back arc volcanic rocks as indicators of continental lithospheric delamination beneath the Argentine Puna plateau,central Andes[J].J.Geophys.Res.,1994,99:24323-24339.
[11]  金振民,高山底侵作用(underplating)及其壳幔演化动力学意义[J].地质科技情报,1996,15(2):1-7.
[12]  高山,金振民.拆沉作用(delamination)及其壳幔演化动力学意义[J].地质科技情报,1997,16(1):1-9.
[13]  广东省地质科学研究所.粤西基性超基性岩的地质特征及形成机理科研报告.1997.
[14]  莫柱孙,叶伯丹,潘维组,等.南岭花岗岩地质学[M].北京:地质出版社,1980.44-66.
[15]  刘颖,刘海臣,李献华.用JCP-MS准确测定岩石样品中的40余种微量元素[J].地球化学,1996,25:552-558.
[16]  路远发.GeoKit:一个用VAB构建的地球化学工具软件包[J].地球化学,2004,33(5):459-464.
[17]  Ludwig K R.Using Isoplot/EX,version 2:a Geochronological Toolkit for Microsoft Excel[M].Berkeley Geochronological Center Special Publication,1999.1-47.
[18]  Middlemost E A K.Naming materials in the magma/igneous rock system[J].Chem.Goel.,1994,77:19-26.
[19]  Le Maitre,et al.A classification of igneous rocks and glossary of terms:Recommendation of the IUGS subkommission on the systematics of igneous rocks[C].Blackwell Scientific Publications,Oxford,1989.1-193.
[20]  Rickwood P C.Boundary lines within petrologic diagrams which use oxides of major and minor elements[J].Lithos,1989,22:247-263.
[21]  Pharaoh T C,Pearce J A.Geochemical evidence for the geotectonic setting of Early Proterozoic metavolcanic sequences in Lepland[J].Precambrian Res.,1984,25:283-308.
[22]  Condie K C.Geochemistry and tectonic setting of Early Proterozoic supracrustal rocks in the southwestern United States[J].J.Geol.,1986,94:845-865.
[23]  Bergh S G,Torske T.Palaeovolcanology and tectonic setting of a Proterozoic metatholeitic sequence near Baltic Shield margin,northern Norway[J].Precambrian Res.,1988,29:227-246.
[24]  Halden N M.Existence of a marginal basin within the Circum-Superior Belt:geochemical evidence from the ChurchillSuperior boundary in Manitoba[J].Canada Precambrian Res.,1991,49:167-183.
[25]  Zhao J-X.Geochemical and Sm-Nd isotopic study of amphibolites in the southern Arunta Inlier,central Australia:evidence for subduction at a Proterozoic margin[J].Precambrian Res.,1994,65:71-94.
[26]  张旗,周国庆.中国蛇绿岩[M].北京:科学出版社,2001.1-32.
[27]  Pearce T H,Gorman B E,Birkett T C.The TiO2-K2O-P2O5diagram:a method of discrimination between oceanic and nonoceanic basalts[J].Earth Plante.Sci.Lett.,1975,24:419-426.
[28]  Mullen E D.MnO/TiO2/P2O5:a minor element discriminant for basaltic rocks of oceanic environments and its implications for petrogensis[J].Earth and Planetary Sciences Letters,1983,62:53-62.
[29]  万渝生,吴澄宇.稀土元素地球化学与玄武质岩石的成因--应用与问题[A].见:张炳熹,洪大卫,吴宣志主编.岩石圈研究的现代方法[C].北京:原子能出版社,2000.201-214.
[30]  张本仁,高山,张宏飞,等.秦岭造山带地球化学[M].北京:科学出版社,2002.47-106.
[31]  Pearce J A.Trace element characteristics of lavas from destractive plate boundaries[A].In:Thorpe R S ed.Andesites[C].New York:Wiley,1982.528-548.
[32]  Pearce J A.Role of the sub-continental lithosphere in magma genesis at active continental margins[A].In:Hawkesworth C J,Norry M J eds.Continental basalts and mantle xenoliths[C].Nantwich:Shiva,1983.230-249.
[33]  Shervais J W.Ti-V plots and the petrogenesis of modern and ophiolitic lavas[J].Earth Planet.Sci.lett.,1982,31:457-484.
[34]  Wood D A.The application of a Th-Hf-Ta diagram to problems of tectonomagrnatic classification and to establishing the nature of crustal contamination of basalitic lavas of the British Tertiary volcanic province[J].Earth Plante.Sci.Lett.,1980,50:11-30.
[35]  Jenner G A,Dunning G R,Malpas J,et al.Bay of Island and Little Port complexes,revisited:age,geochemical and isotopic evidence confirm suprasubduction-zone origin[J].Canadian Journal of Earth Sciences,1991,28:1635-1652.
[36]  李曙光.εNd-La/Nb、Ba/Nb和Nb/Th图对地幔不均一性研究的意义:岛弧火山岩分类及EMⅡ端元的分解[J].地球化学,1994,23(2):105-114.
[37]  李曙光,聂永红,郑双根,等.俯冲地壳与上地幔的相互作用--大别同碰撞镁铁-超镁铁岩的主要元素及痕量元素地球化学[J].中国科学(D辑),1997,27(6):488-493.
[38]  李曙光,聂永红,Emil Jagoutz,等.大别山俯冲陆壳再循环--地球化学证据[J].中国科学(D辑),1997,27(5):412-418.
[39]  李曙光,黄方,李晖.大别-苏鲁造山带碰撞后的岩石圈的拆离[J].中国科学(D辑),2001,47(17):1487-1491.
[40]  陈斌,庄育勋.粤西云炉紫苏花岗岩及其麻粒岩包体的主要特征和成因讨论[J].岩石学报,1994,(2):139-148.

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