河南卢氏八宝山花岗斑岩LA-ICP-MS锆石U-Pb年龄和Hf同位素组成特征
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摘要
河南省卢氏县八宝山岩体位于华北克拉通南缘东秦岭西段,岩体呈筒状,可能为古火山机构岩颈相的超浅成侵入体,成矿组合上为独特的以铁为主的多金属矿化。八宝山岩体边缘相为钾长花岗斑岩、中心相为黑云母二长花岗斑岩。二者的LA-ICP-MS锆石U-Pb年龄非常一致,分别为146.6±1.6Ma和145.9±1.9Ma,说明他们可能是同期岩浆侵入作用分异的产物。钾长花岗斑岩和黑云母二长花岗斑岩锆石Hf同位素组成特征也非常相似,εHf(t)值分别为-27.55～-20.71和-27.30～-21.90,tDM2值分别为1.80～2.93Ga和2.03～2.92Ga,表明该岩体的源区物质以壳源物质为主。综合分析表明,八宝山岩体可能是扬子俯冲陆壳部分熔融的作物,并可能混入少量的太华群和熊耳群的物质,其形成的地球动力学背景可能为俯冲碰撞后的伸展环境。
The Babaoshan granite intrusion in Lushi county, Henan province, is tectonically located in the southern margin of North China Craton, on the western part of East Qinling orogen. The granite intrusion occurs as circular column which might have been the neck of volcanic edifice; while the associated iron ore deposit with accompanying Cu-Mo-Pb-Zn mineralization makes it a unique target for metallogenetic investigation in East Qinling area. The Babaoshan granite intrusion is a zoned granitic stock consisting of syenogranite porphyry in the outer zone and biotite monzogranite porphyry in the inner zone. LA-ICP-MS zircon U-Pb determination indicates that the syenogranite porphyry and biotite monzogranite porphyry are roughly coeval, formed at 146.6±1.6 Ma and 145.9±1.9 Ma, respectively. Zircon Hf isotope compositions of the syenogranite porphyry and biotite monzogranite porphyry are proximately identical, with εHf(t) values vary in ranges of -27.55~-20.71 and -27.30~-21.90, with Hf crustal model ages(tDM2) of 1.80~2.93 Ga and 2.03~2.92 Ga, respectively, indicative of crustal origin. Considering the tectonic evolution and geochemical characteristics of the granite as well as other Mesozoic granites in the southern margin of North China Craton, we suggest that the Babaoshan granite along with other Mesozoic granites was most likely derived from partial melting of subducted crust of Yangtze Craton, and possibly with minor involvement of the Taihua Group and Xiong′er Group under extensional tectonic regime following depression of the subduction-collision between the Yangtze and North China cratons.
The Babaoshan granite intrusion in Lushi county, Henan province, is tectonically located in the southern margin of North China Craton, on the western part of East Qinling orogen. The granite intrusion occurs as circular column which might have been the neck of volcanic edifice; while the associated iron ore deposit with accompanying Cu-Mo-Pb-Zn mineralization makes it a unique target for metallogenetic investigation in East Qinling area. The Babaoshan granite intrusion is a zoned granitic stock consisting of syenogranite porphyry in the outer zone and biotite monzogranite porphyry in the inner zone. LA-ICP-MS zircon U-Pb determination indicates that the syenogranite porphyry and biotite monzogranite porphyry are roughly coeval, formed at 146.6±1.6 Ma and 145.9±1.9 Ma, respectively. Zircon Hf isotope compositions of the syenogranite porphyry and biotite monzogranite porphyry are proximately identical, with εHf(t) values vary in ranges of -27.55~-20.71 and -27.30~-21.90, with Hf crustal model ages(tDM2) of 1.80~2.93 Ga and 2.03~2.92 Ga, respectively, indicative of crustal origin. Considering the tectonic evolution and geochemical characteristics of the granite as well as other Mesozoic granites in the southern margin of North China Craton, we suggest that the Babaoshan granite along with other Mesozoic granites was most likely derived from partial melting of subducted crust of Yangtze Craton, and possibly with minor involvement of the Taihua Group and Xiong′er Group under extensional tectonic regime following depression of the subduction-collision between the Yangtze and North China cratons.
引文
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王晓霞,王涛,齐秋菊,李舢.2011.秦岭晚中生代花岗岩时空分布,成因演变及构造意义.岩石学报,27(6):1573-1593.
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向君峰,赵海杰,李永峰,程彦博,高亚龙,侯可军,董春艳,李向前.2010.华北地台南缘张士英岩体的锆石SHRIMP U-Pb测年、Hf同位素组成及其地质意义.岩石学报,26(3):871-887.
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谢烈文,张艳斌,张辉煌,孙金凤,吴福元.2008.锆石/斜锆石U-Pb和Lu-Hf同位素以及微量元素成分的同时原位测定.科学通报,53(2):220-228.
颜正信,孙卫志,张年成,周梅,黄智华.2007.河南灵宝银家沟硫铁多金属矿床成矿地质条件及找矿方向.地质调查与研究,30(2):149-157.
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印修章,胡爱珍.2004.以闪锌矿标型特征浅论豫西若干铅锌矿成因.物探与化探,28(5):413-417.
翟明国,孟庆任,刘建明,侯泉林,胡圣标,李忠,张宏福,刘伟,邵济安,朱日祥.2004.华北东部中生代构造体制转折峰期的主要地质效应和形成动力学探讨.地学前缘,11(3):285-297.
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赵太平,徐勇航,翟明国.2007.华北陆块南部元古宙熊耳群火山岩的成因与构造环境:事实与争议.高校地质学报,13(2):1-206.
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Amelin Y,Lee D C and Halliday A N.2000.Early-middle Ar-chean crustal evolution deduced from Lu-Hf and U-Pb iso-topic studies of single zircon grains.Geochimica et Cosmo-chimica Acta,64(24):4205-4225.
Amelin Y,Lee D C,Halliday A N and Pidgeon R T.1999.Na-ture of the Earth's earliest crust from hafnium isotopes in single detrital zircons.Nature,399(6733):252-255.
Chu N C,Taylor R N,Chavagnac V,Nesbitt R W,Boella RM,Milton J A,German C R,Bayon G and Burton K.2002.Hf isotope ratio analysis using multi-collector induc-tively coupled plasma mass spectrometry:An evaluation ofisobaric interference corrections.Journal of Analytical A-tomic Spectrometry,17(12):1567-1574
Gilder S and Courtillot V.1997.Timing of the North-South Chi-na collision from new middle to late Mesozoic paleomagneticdata from the North China Block.Journal of GeophysicalResearch,102(B8):17713-17727.
Jackson S E,Pearson N J,Griffin W L and Belousova E A.2004.The application of laser ablation-inductively coupledplasma-mass spectrometry to in situ U-Pb zircon geochro-nology.Chemical Geology,11(1-2):47-69.
Ludwig.2003.ISOPLOT3:A geochronological toolkit for Mi-crosoft excel.Berkeley Geochronology Centre,Special Publi-cation,4:74.
Mao J W,Wang Y,Zhang Z H,Yu J J and Niu B G.2003.Geodynamic settings of Mesozoic large-scale mineralizationin North China and adjacent areas.Science in China(Se-ries D:Earth Sciences),46(8):838-851.
Mao J W,Xie G Q,Bierlein F,Qu W J,Du A D,Ye H S,Pi-rajno F,Li H M,Guo B J,Li Y F and Yang Z Q.2008.Tectonic implications from Re-Os dating of Mesozoic molyb-denum deposits in the East Qinling-Dabie orogenic belt.Geochimica et Cosmochimica Acta,72(18):4607-4626.
Mao J W,Xie G Q,Pirajno F,Ye H S,Wang Y B,Li Y F,Xiang J F and Zhao H J.2010.Late Jurassic-Early Creta-ceous granitoid magmatism in Eastern Qinling,central-east-ern China:SHRIMP zircon U-Pb ages and tectonic implica-tions.Australian Journal of Earth Sciences,57(1):51-78.
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