北秦岭寨根地区富铌辉长岩地球化学特征及其构造意义
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摘要
富铌辉长岩往往与高镁闪长岩、埃达克岩共生,被认为是具有指相意义的岩石构造组合,但豫西地区北秦岭造山带南侧该类岩浆活动却很少被发现.对寨根地区秦岭岩群中的斜长角闪岩类进行岩石学、地球化学、同位素地球化学和年代学研究,在该深成杂岩中发现了富铌辉长岩,并且测得富铌辉长岩的变质锆石U-Pb年龄为484.3±1.8Ma,与区内超高压榴辉岩变质峰值年龄相近.富铌辉长岩地球化学特征表现为富集Rb、Th等大离子亲石元素,亏损Nb、Ta、P等高场强元素,εNd(t)介于-1.61～+0.49,相应的(87Sr/86Sr)i范围为0.714 273～0.723 936.推测其成因与秦岭古陆壳深俯冲过程中部分熔融的板片熔体交代地幔楔橄榄岩再熔融有关,经受深俯冲时有大量陆壳物质的加入,该发现为秦岭造山带早古生代早期存在多个微陆块提供了证据.
Nb-enriched gabbros are often associated with high-Mg diorite and adakite,which is considered to be a petrotectonic association of facies significance.However,this kind of magmatic activity has seldom been found in the southern side of the North Qinling orogenic belt in western Henan.Based on the method of petrology,geochemistry,isotope geochemistry and chronology for amphibolites from the Qinling Group in Zhaigen area,the Nb-enriched gabbros were separated from the deep plutonic complex in this study.The results show that the U-Pb age of metamorphic zircons from Nb-enriched gabbros is484.3±1.8Ma,which is similar to the peak of metamorphic ages of the UHP eclogites in this area.Nb-enriched gabbros are characterized by enrichment of Rb,Th and other heavy ion lithophilic elements and depletion of Nb,Ta,P and other high field strength elements.εNd(t)values range from-1.61to+0.49,and(87Sr/86Sr)ivalues range from 0.714 273 to 0.723 936.We speculated that their formation was related to the remelting of mantle wedge peridotite by partially melted plate melts during the deep subduction of the Qinling paleocontinental crust.And a large amount of continental crust was added to the deep subduction.The discovery of Nb-enriched gabbros provides evidence for the existence of multiple small continental blocks in the Early Paleozoic of the Qinling orogen.
Nb-enriched gabbros are often associated with high-Mg diorite and adakite,which is considered to be a petrotectonic association of facies significance.However,this kind of magmatic activity has seldom been found in the southern side of the North Qinling orogenic belt in western Henan.Based on the method of petrology,geochemistry,isotope geochemistry and chronology for amphibolites from the Qinling Group in Zhaigen area,the Nb-enriched gabbros were separated from the deep plutonic complex in this study.The results show that the U-Pb age of metamorphic zircons from Nb-enriched gabbros is484.3±1.8Ma,which is similar to the peak of metamorphic ages of the UHP eclogites in this area.Nb-enriched gabbros are characterized by enrichment of Rb,Th and other heavy ion lithophilic elements and depletion of Nb,Ta,P and other high field strength elements.εNd(t)values range from-1.61to+0.49,and(87Sr/86Sr)ivalues range from 0.714 273 to 0.723 936.We speculated that their formation was related to the remelting of mantle wedge peridotite by partially melted plate melts during the deep subduction of the Qinling paleocontinental crust.And a large amount of continental crust was added to the deep subduction.The discovery of Nb-enriched gabbros provides evidence for the existence of multiple small continental blocks in the Early Paleozoic of the Qinling orogen.
引文
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Li,Y.,Yang,J.S.,Pei,X.Z.,et al.,2012.A Model for MultiStage of the Early Palaeozoic Danfeng Ophiolite in Qinling Orogen Belt:From Arc to Inter-Arc Basin.Acta Petrologica Sinica,28(6):1896-1914(in Chinese with English abstract).
Liu,J.B.,Chen,N.S.,Su,W.,2018.Tectonic Boundary and Ceasing Time of Amalgamation between the North China Craton and the North Qinling Belt.Journal of Earth Science,29(5):1074-1080.https://doi.org/10.1007/s12583-018-0847-8
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Liu,Y.S.,Gao,S.,Hu,Z.C.,et al.,2010.Continental and Oceanic Crust Recycling-Induced Melt-Peridotite Interactions in the Trans-North China Orogen:U-Pb Dating,Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths.Journal of Petrology,51(1-2):537-571.https://doi.org/10.1093/petrology/egp082
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Mao,X.H.,Zhang,J.X.,Yu,S.Y.,et al.,2018.Metamorphism of Qinling Complex in Northern West Qinling Orogen:Petrology,Phase Equilibria Modelling of Paragneiss and Their Geological Implication.Earth Science,43(1):278-295(in Chinese with English abstract).https://doi.org/10.3799/dqkx.2018.017
Pei,X.Z.,Wang,T.,Ding,S.P.,et al.,2003.Geochemical Characteristics and Geological Significance of Neoproterozoic Adakitic Granitoids on the North Side of the Shangdan Zone in the East Qinling.Geology in China,30(4):372-381(in Chinese with English abstract).
Qu,W.,Liu,X.C.,Cui,J.J.,et al.,2018.40 Ar/39 Ar Dating of Muscovite from the Guishan Complex in the Tongbai Orogen,Central China,and Its Geological Implications.Earth Science,43(1):247-258(in Chinese with English abstract).https://doi.org/10.3799/dqkx.2018.015
Stern,R.J.,Kohut,E.,Bloomer,S.H.,et al.,2006.Subduction Factory Processes beneath the Guguan Cross-Chain,Mariana Arc:No Role for Sediments,are Serpentinites Important?Contributions to Mineralogy and Petrology,151(2):202-221.https://doi.org/10.1007/s00410-005-0055-2
Streck,M.J.,Leeman,W.P.,Chesley,J.,2007.High-Magnesian Andesite from Mount Shasta:A Product of Magma Mixing and Contamination,not a Primitive Mantle Melt.Geology,35(4):351.https://doi.org/10.1130/g23286a.1
Sun,S.S.,McDonough,W.F.,1989.Chemical and Isotopic Systematics of Oceanic Basalts:Implications for Mantle Composition and Processes.Geological Society,London,Special Publications,42(1):313-345.https://doi.org/10.1144/gsl.sp.1989.042.01.19
Tatsumi,Y.,2006.High-Mg Andesites in the Setouchi Volcanic Belt,South Western Japan:Analogy to Archean Magmatism and Continental Crust Formation?Annual Review of Earth and Planetary Sciences,34(1):467-499.https://doi.org/10.1146/annurev.earth.34.031405.125014
Turner,S.,Hawkesworth,C.,Rogers,N.,et al.,1997.U-Th Isotope Disequilibria and Ocean Island Basalt Generation in the Azores.Chemical Geology,139(1-4):145-164.https://doi.org/10.1016/s0009-2541(97)00031-4
Wan,Y.S.,Liu,D.Y.,Dong,C.Y.,et al.,2011.SHRIMP Zircon Dating of Meta-Sedimentary Rock from the Qinling Group in the North of Xixia,North Qinling Orogenic Belt:Constraints on Complex Histories of Source Region and Timing of Deposition and Metamorphism.Acta Petrologica Sinica,27(4):1172-1178(in Chinese with English abstract).
Wang,T.,Zhang,Z.Q.,Wang,X.X.,et al.,2005.Neoproterozoic Collisional Deformation in the Core of the Qinling Orogen and Its Age:Constrained by Zircon SHRIMP Dating of Strongly Deformed Syn-Collisional Granites and Weakly Deformed Granitic Veins.Acta Geologica Sinica,79(2):220-231(in Chinese with English abstract).
Wang,X.X.,Wang,T.,Zhang,C.L.,et al.,2015.Granitoid Magmatism in the Qinling Orogen,Central China and Its Bearing on Orogenic Evolution.Science in China(Series D),45(8):1109-1125(in Chinese).
Wang,Z.Q.,Yan,Q.R.,Yan,Z.,et al.,2009.New Division of the Main Tectonic Units of the Qinling Orogenic Belt,Central China.Acta Petrologica Sinica,83(11):1527-1546(in Chinese with English abstract).
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