滇东南建水地区高镁火山岩包体的成因和构造背景
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摘要
在滇东南建水地区发现产于峨眉山玄武岩中的高镁火山岩包体,这对于地幔柱的形成演化具有重要研究意义.对这些包体进行了锆石U-Pb年代学、地球化学和岩矿分析.高镁火山岩包体具斑状结构,致密块状构造,斑晶主要为贵橄榄石和透辉石.13颗锆石U-Pb LA-ICP-MS加权平均年龄为259±2Ma(MSWD=1.9),显示与寄主岩石同期形成.包体岩石具有高镁(Mg~#=68～75)、低硅(SiO_2=45.11%～45.93%)特征,轻稀土元素(LREE)、高场强元素(HFSE)富集而重稀土元素(HREE)亏损,属于亚碱性、拉斑玄武岩系列,具有板内玄武岩(IPB)特征.火山岩包体的原始岩浆起源于石榴子石二辉橄榄岩低程度部分熔融的产物,岩浆演化过程中发生了橄榄石和单斜辉石的分离结晶作用,在侵位上升过程中未受明显的地壳混染作用.该高镁火山岩的存在,显示地幔柱除了垂直上升运动外,在地球深部不同的边界还有多次侧向扩展移动,表明滇东南晚二叠世存在峨眉山地幔柱的一个分支-地幔枝活动.
It reports for the first time the presence of a suite of high-Mg volcanic xenoliths in Jianshui area of Southeast Yunnan,western Yangtze platform,China,which provides new insights into mantle plume activity in the platform during the Permian.Zircon U-Pb dating,geochemistry and petrology of the xenoliths were studied to assess the petrogenetic origin and geodynamic setting of these high-Mg volcanic rocks in this paper.The high-Mg volcanic xenoliths are porphyritic texture and contain only large phenocrysts of olivine,which show as dense mass,develop as lenticulars in the Permian Emeishan basalts in Jianshui area,Southeast Yunnan.The igneous zircons from the volcanic xenoliths yield a weighted age of ca.259±2 Ma that is interpreted to be the formation age of the magmatic protolith,which is the same as the host rocks of the Emeishan basalts.The volcanic xenoliths are characterized by low SiO_2,moderate TiO_2 and high Mg~#.All the volcanic xenoliths are enriched in LREE but depleted in HREE.The geochemical characteristics of the xenoliths show that they belong to sub-alkali basalts and intra-plate tholeiitic basalts,suggesting that the primary magma of the high-Mg volcanic rock is likely produced by low partial melting of garnet lherzolite.The original magma may have undergone the process of fractional crystallization of olivines and clinopyroxenes.The original magma has not been affected obviously by crustal material contamination in the emplacement and uplifting.The high-Mg volcanic xenoliths may origin from riched-mantle and may be the product of the main stage of the mantle plume activity.All above indicates that there was a mantle branch developed in the study area in Late Permian.It is proposed that several mantle branches have not only ascending motion but also lateral movement while the thermal melting mantle plume arrives at the boundary of mantle and crust.
It reports for the first time the presence of a suite of high-Mg volcanic xenoliths in Jianshui area of Southeast Yunnan,western Yangtze platform,China,which provides new insights into mantle plume activity in the platform during the Permian.Zircon U-Pb dating,geochemistry and petrology of the xenoliths were studied to assess the petrogenetic origin and geodynamic setting of these high-Mg volcanic rocks in this paper.The high-Mg volcanic xenoliths are porphyritic texture and contain only large phenocrysts of olivine,which show as dense mass,develop as lenticulars in the Permian Emeishan basalts in Jianshui area,Southeast Yunnan.The igneous zircons from the volcanic xenoliths yield a weighted age of ca.259±2 Ma that is interpreted to be the formation age of the magmatic protolith,which is the same as the host rocks of the Emeishan basalts.The volcanic xenoliths are characterized by low SiO_2,moderate TiO_2 and high Mg~#.All the volcanic xenoliths are enriched in LREE but depleted in HREE.The geochemical characteristics of the xenoliths show that they belong to sub-alkali basalts and intra-plate tholeiitic basalts,suggesting that the primary magma of the high-Mg volcanic rock is likely produced by low partial melting of garnet lherzolite.The original magma may have undergone the process of fractional crystallization of olivines and clinopyroxenes.The original magma has not been affected obviously by crustal material contamination in the emplacement and uplifting.The high-Mg volcanic xenoliths may origin from riched-mantle and may be the product of the main stage of the mantle plume activity.All above indicates that there was a mantle branch developed in the study area in Late Permian.It is proposed that several mantle branches have not only ascending motion but also lateral movement while the thermal melting mantle plume arrives at the boundary of mantle and crust.
引文
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Dmitriev,Y.I.,Bogatikov,O.A.,1996.Emeishan Flood Basalts,Yangtze Platform:Indications of an Aborted Oceanic Environment.Petrology,4:407-418.
Frey,F.A.,Green,D.H.,Roy,S.D.,1978.Integrated Models of Basalt Petrogenesis:A Study of Quartz Tholeiites to Olivine Melilitites from South Eastern Australia Utilizing Geochemical and Experimental Petrological Data.Journal of Petrology,19(3):463-513.https://doi.org/10.1093/petrology/19.3.463
Gan,X.C.,Zhao,F.Q.,Jin,W.S.,et al.,1996.The U-Pb Ages of Early Proterozoic-Archean Zircons Captured by Igneous Rocks in Southern China.Geochimica,25(2):112-120(in Chinese with English abstract).
Geoffrey,F.D.,2005.Grounds for the Mantle Existing.Chinese Science Bulletin,50(17):1801-1813.
He,Q.,Xiao,L.,Balta,B.,et al.,2010.Variety and Complexity of the Late-Permian Emeishan Basalts:Reappraisal of Plumelithosphere Interaction Processes.Lithos,119(1-2):91-107.https://doi.org/10.1016/j.lithos.2010.07.020
He,B.,Xu,Y.G.,Xiao,L.,et al.,2006.Sedimentary Responses to Uplift of Emeishan Mantle Plume and Its Implications.Geological Review,52(1):30-37(in Chinese with English abstract).
Hofmann,A.W.,1988.Chemical Differentiation of the Earth:The Relationship between Mantle,Continental Crust,and Oceanic Crust.Earth and Planetary Science Letters,90(3):297-314.https://doi.org/10.1016/0012-821x(88)90132-x
Hou,Z.Q.,Lu,J.R.,Lin,S.Z.,2005.The Axial Zone Consisting of Pyrolite and Eclogite in the Emei Mantle Plume Major,Trace Element and Sr-Nd-Pb Isotope Evidence.Acta Geologica Sinica,79(2):200-219(in Chinese with English abstract).
Hou,Z.Q.,Wang,Y.L.,Zhang,C.J.,et al.,1999.Chemical Characteristic of Major Elements,Cr and Ni of Mantle Plume in Emei Igneous Province.Geological Review,45(Suppl.):880-884(in Chinese with English abstract).
Irvine,T.N.,Baragar,W.R.A.,1971.A Guide to the Chemical Classification of the Common Volcanic Rocks.Canadian Journal of Earth Sciences,8(5):523-548.https://doi.org/10.1139/e71-055
Lassiter,J.C.,Depaolo,D.J.,1997.Plume/Lithosphere Interaction in the Generation of Continental and Oceanic Flood Basalts:Chemical and Isotope Constraints.Geophysical Monography 100,American Geophysical Union,100:335-355.
Le,M.J.,Le,R.W.,Streckeisen,A.,1986.A Chemical Classification of Volcanic Rocks Based on the Total Alkalisilica Diagram.Journal of Petrology,27:745-750.
Li,H.B.,Zhang,Z.C.,Lü,L.S.,2010.Geometry of the Mafic Dyke Swarms in Emeishan Large Igneous Province:Implications for Mantle Plume.Acta Petrologica Sinica,26(10):3143-3152(in Chinese with English abstract).
Li,X.R.,Wang,J.,Wan,Y.L.,et al.,2018.Geochemical Characteristics and Tetonic Implications of Nayixiong Formation Basalts in Eastern Qiangtang Basin,Tibet.Earth Science,43(2):401-416(in Chinese with English abstract).
Liu,Y.P.,Ye,L.,Li,C.Y.,et al.,2006.Discovery of the Neoproterozoic Magmatics in Southeastern Yunnan:Evidence from SHRIMP Zircon U-Pb Dating and Lithogeochemistry.Acta Petrologica Sinica,22(4):916-926(in Chinese with English abstract).
Luo,Z.L.,Jin,Y.Z.,Zhao,X.K.,1990.The Emei Taphrogenesis of the Upper Yangtze Platform in South China.Geological Magazine,127(5):393-405.https://doi.org/10.1017/s0016756800015156
Neal,C.R.,2002.Mantle Sources and the Highly Variable Role of Continental Lithosphere in Basalt Petrogenesis of the Kerguelen Plateau and Broken Ridge LIP:Results from ODPLeg 183.Journal of Petrology,43(7):1177-1205.https://doi.org/10.1093/petrology/43.7.1177
Nickel,K.G.,1986.Phase Equilibria in the System SiO2-MgO-Al2O3-CaO-Cr2O3(SMACCR)and Their Bearing on Spinel/Garnet Iherzolite Relationships.Neues Jahrbuch Fur Mineralogie-Abhandlungen,155(3):259-287.
Pan,X.N.,Zhao,J.T.,Zhang,X.Y.,et al.,1987.Tectonics and Rifting in Kangdian Region.Chongqing Publishing House,Chongqing,214-224(in Chinese).
Pearce,J.A.,Cann,J.R.,1973.Tectonic Setting of Basic Volcanic Rocks Determined Using Trace Element Analyses.Earth and Planetary Science Letters,19(2):290-300.https://doi.org/10.1016/0012-821x(73)90129-5
Song,X.Y.,Hou,Z.Q.,Cao,Z.M.,et al.,2001.Geochemical Characteristics and Period of the Emei Igneous Province.Acta Geologica Sinica,75(4):498-506(in Chinese with English abstract).
Song,X.Y.,Zhou,M.F.,Cao,Z.M.,et al.,2004.Late Permian Rifting of the South China Craton Caused by the Emeishan Mantle Plume?.Journal of the Geological Society,161(5):773-781.https://doi.org/10.1144/0016-764903-135
Wang,L.X.,Ma,C.Q.,Lai,Z.X.,et al.,2015.Early Jurassic Mafic Dykes from the Xiazhuang Ore District(South China):Implications for Tectonic Evolution and Uranium Metallogenesis.Lithos,239:71-85.https://doi.org/10.1016/j.lithos.2015.10.008
Wang,Y.,Ma,C.Q.,Wang,L.X.,et al.,2018.Zircon U-Pb Geochronoloty,Geochemistry and Sr-Nd-Hf Isotopes of the Neoproterozoic Granites on the Southeastern Margin of the Yangtze Block:Constraint on Crustal Growth.Earth Science,43(3):635-654(in Chinese with English abstract).
Wang,Y.L.,Zhang,C.J.,Xiu,S.Z.,2001.Th/Hf-Ta/Hf Identification of Tectonic Setting of Basalts.Acta Petrologica Sinica,17(3):413-421(in Chinese with English abstract).
Winchester,J.A.,Floyd,P.A.,1977.Geochemical Discrimination of Different Magma Series and Their Differentiation Products Using Immobile Elements.Chemical Geology,20:325-343.https://doi.org/10.1016/0009-2541(77)90057-2
Wood,D.A.,1980.The Application of a ThHfTa Diagram to Problems of Tectonomagmatic Classification and to Establishing the Nature of Crustal Contamination of Basaltic Lavas of the British Tertiary Volcanic Province.Earth and Planetary Science Letters,50(1):11-30.https://doi.org/10.1016/0012-821x(80)90116-8
Wu,Y.B.,Zheng,Y.F.,2004.Study on the Mineralogy of Zircon and Its Constraints on the Interpretation of U-Pb Age.Chinese Science Bulletin,49(16):1589-1604(in Chinese).
Xiao,L.,Xu,Y.G.,Mei,H.J.,et al.,2003.Geochemistry of Emeishan Flood Basalts at Binchuan Area,SW China:Rock Types and Temporal Evolution.Chinese Journal of Geology,38(4):478-494(in Chinese with English abstract).
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