华北克拉通北缘八当山火山岩及变质石英闪长岩锆石U-Pb年龄与岩石地球化学特征
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摘要
赤峰东部郎郡哈拉地区变质石英闪长岩侵入到八当山火山岩中。用LA-ICP-MS技术,测得赤峰郎郡哈拉地区片理化流纹岩和变质石英闪长岩锆石~(206)Pb/~(238)U年龄分别为387.6±2.8Ma(MSWD=0.27,n=26)和387.1±2.3Ma(MSWD=0.34,n=28),可分别代表片理化流纹岩和变质石英闪长岩的形成年龄,属于中泥盆世岩浆活动的产物。根据地球化学特征,片理化流纹岩具有高硅、碱、铝,贫铁、镁、钙及过铝质的特征,属于钙碱性系列岩浆。轻、重稀土元素分馏较弱,具有弱负Eu异常。该片理化流纹岩具富集大离子亲石元素,亏损高场强元素,有明显的Ti、Nb和Ta负异常,Ti/Y和Zr/Y值较低,显示壳源特征。变质石英闪长岩具有高铝、铁、镁、钙及过铝质的特征,属于钙碱性系列岩浆。轻、重稀土元素分馏较弱,具有弱负Eu异常。该变质石英闪长岩富集大离子亲石元素,亏损高场强元素,有明显的Ta、Nb、Y负异常,显示出壳幔混源特征。构造环境判别显示,二者形成于活动大陆边缘,是大洋板块俯冲后的产物,可能与白乃庙岛弧和华北克拉通北缘碰撞后的伸展环境有关。
Metamorphic quartz diorite intruded into the the Badangshan volcanic rocks in Langjunhala area, eastern Chifeng City. LAICP-MS zircon U-Pb dating technique constrained the age of schistosity rhyolite and quartz diorite. The results show that the ages of schistosity rhyolite and quartz diorite are 387.6 ± 2.8 Ma and 387.1 ± 2.3 Ma, aindicating the Middle Devonian magmatic activity.According to the geochemical characteristics of foliated rhyolite with high silicon, alkali, aluminum, iron, magnesium, calcium and poor peraluminous characteristics, the rocks belong to the calc alkaline series. The light and heavy REE fractionation is weak and the Eu has weak negative anomaly. The foliated rhyolite has lower Ti/Y and Zr/Y ratios, implying the source of lithospheric mantle.Metamorphic quartz diorite is characterized by high aluminium, iron, magnesium, calcium and peraluminous, belonging to calcalkaline series magma. The fractionation of light and heavy rare earth elements is weak, with weak negative Eu anomaly. The metamorphic quartz diorite is enriched in large ion lithophile elements and depleted in high field strength elements. It has obvious negative anomalies of Ta, Nb and Y, implying mixed source characteristics of crust and mantle. Tectonic environment discriminations show that it formed on the active continental margin and was the product of subduction of the oceanic plate, probably related to the extensional environment after the collision between the Bainaimiao island arc and the northern margin of the North China craton.
Metamorphic quartz diorite intruded into the the Badangshan volcanic rocks in Langjunhala area, eastern Chifeng City. LAICP-MS zircon U-Pb dating technique constrained the age of schistosity rhyolite and quartz diorite. The results show that the ages of schistosity rhyolite and quartz diorite are 387.6 ± 2.8 Ma and 387.1 ± 2.3 Ma, aindicating the Middle Devonian magmatic activity.According to the geochemical characteristics of foliated rhyolite with high silicon, alkali, aluminum, iron, magnesium, calcium and poor peraluminous characteristics, the rocks belong to the calc alkaline series. The light and heavy REE fractionation is weak and the Eu has weak negative anomaly. The foliated rhyolite has lower Ti/Y and Zr/Y ratios, implying the source of lithospheric mantle.Metamorphic quartz diorite is characterized by high aluminium, iron, magnesium, calcium and peraluminous, belonging to calcalkaline series magma. The fractionation of light and heavy rare earth elements is weak, with weak negative Eu anomaly. The metamorphic quartz diorite is enriched in large ion lithophile elements and depleted in high field strength elements. It has obvious negative anomalies of Ta, Nb and Y, implying mixed source characteristics of crust and mantle. Tectonic environment discriminations show that it formed on the active continental margin and was the product of subduction of the oceanic plate, probably related to the extensional environment after the collision between the Bainaimiao island arc and the northern margin of the North China craton.
引文
[1]Windley B F.Accretion leading to collision and the Permian Solonker suture,Inner Mongolia,China:Termination of the central Asian orogenic belt[C]//中国科学院地质与地球物理研究所二〇〇三学术论文汇编·第一卷.2003.
[2]Xiao W J,Windley B F,Hao J,et al.Accretion leading to collision and the Permian Solonker suture,Inner Mongolia,China:Termination of the central Asian orogenic belt[J].Tectonics,2003,22(6):1069-1088.
[3]李锦轶,张进,杨天南,等.北亚造山区南部及其毗邻地区地壳构造分区与构造演化[J].吉林大学学报,2009,39(4):584-605.
[4]Seng?r A M C,Natal’in B A,Burtman V S.Evolution of the Altaid tectoniccollage and Paleozoic crustal growth in Eurasia[J].Nature,1993,364:209-307.
[5]Stampfli G M,Borel G D.A plate tectonic model for the Paleozoic and Mesozoic constrained by dynamic plate boundaries and restored synthetic oceanic isochrones[J].Earth Planet.Sci.Lett.,2002,196:17-33.
[6]刘建峰,李锦轶,迟效国,等.华北克拉通北缘与弧-陆碰撞相关的早泥盆世长英质火山岩-锆石U-Pb定年及地球化学证据[J].地质通报,2013,32(2):267-278.
[7]叶浩,张拴宏,赵越,等.内蒙古赤峰地区泥盆纪晚期火山岩的发现及其地质意义[J].地质通报,2014,33(9):1274-1283.
[8]刘正宏,徐仲元,张超,等.内蒙古白乃庙群形成时代及其构造环境[C]//第六届构造地质与地球动力学学术研讨会摘要集,2013:213-214.
[9]侯可军,李延河,田有荣.LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J].矿床地质,2009,28(4):481-492.
[10]Liu Y,Hu Z,Gao S,et al.In situ,analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,2008,257(1/2):34-43.
[11]Ludwig K R.User’s manual for isoplot 3.00:a geochronological toolkit for Microsoft Execl[J].Berkeley Geochronology Center Special Publication,2003,4:70.
[12]Rollinson H R.The geochemisrty of mafic and ultramafic rocks from the Archaean greenstone belts of Sierra Leone[J].Mineral.Mag.,1983,47:267-280.
[13]Pearce J A,Peate D W.Tectonic implications of the composition of volcanic arc magmas[J].Annu.Rev.Earth Plant.Sci.,1995,23:251-285.
[14]Elliott T,Plank T,Zindler A,et al.Element transport from slab to volcanic front at the Mariana arc[J].Journal of Geophysical Research Atmospheres,1997,1021(B7):14991-15020.
[15]Wilson M.Igneous petrogenesis[M].London:Unwin Hyman,1989:1-466.
[16]Jahn B M,Wu F Y,Lo C H,et al.Crust-mantle interaction induced by deep subduction of the continental crust:geochemical and Sr-Nd isotopic evidence from post-collisional maficultramafic intrusions of the northern Dabie complex,central China[J].Chemical Geology,1999,157:119-146.
[17]Pearce J A.Role of the sub-continental lithosphere in magma genesis at active continental margins[J].Journal of the Electrochemical Society,1983,147(6):2162-2173.
[18]柳长峰,刘文灿,王慧平,等.华北克拉通北缘白乃庙组变质火山岩锆石定年与岩石地球化学特征[J].地质学报,2014,88(7):1273-1287.
[19]Brown G C,Thorpe R S,Webb P C.The geochemical characteristics of granitoids in contrasting arcs and comments on magma sources[J].Journal of the Geological Society,1984,141(3):413-426.
[20]Atherton M P,Petford N.Genetation of sodium-rich magmas from newly underplated basaltic crust[J].Nature,1993,362:144-146.
[21]Pearce J A,Harris N B W,Tindle A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25:956-983.
[22]Zhang W,Jian P,Kr?ner A,et al.Magmatic and metamorphic development of an early to mid-Paleozoic continental margin arc in the southernmost Central Asian Orogenic Belt,Inner Mongolia,China[J].Journal of Asian Earth Sciences,2013,72(4):63-74.
[23]Jian P,Liu D,Kr?ner A,et al.Time scale of an early to midPaleozoic orogenic cycle of the long-lived Central Asian Orogenic Belt,Inner Mongolia of China:Implications for continental growth[J].Lithos,2008,101(3/4):233-259.
[24]张维,简平.内蒙古达茂旗北部早古生代花岗岩类SHRIMP U-Pb年代学[J].地质学报,2008,82(6):778-787.
[25]Zhang S H,Zhao Y,Liu X C,et al.Late Paleozoic to Early Mesozoic mafic-ultramafic complexes from the northern North China Block:Constraints on the composition and evolution of the lithospheric mantle[J].Lithos,2009,110(1):229-246.
[26]Zhang S H,Zhao Y,Song B,et al.Petrogenesis of the Middle Devonian Gushan diorite pluton on the northern margin of the North China block and its tectonic implications[J].Geological Magazine,2007,144(3):16-24.
[27]许立权.内蒙古白云鄂博-满都拉地区加里东期-华力西期-印支期岩浆岩特征与大地构造演化探讨[D].中国地质大学(北京)博士学位论文,2005.
[28]王兴安.华北板块北缘中段早古生代-泥盆纪构造演化[D].吉林大学博士学位论文,2014.
[29]Zhang S H,Zhao Y,Davis G A,et al.Temporal and spatial variations of Mesozoic magmatism and deformation in the North China Craton:Implications for lithospheric thinning and decratonization[J].Earth-Science Reviews,2014,131(4):49-87.
[30]刘敦一,简平,张旗,等.内蒙古图林凯蛇绿岩中埃达克岩SHRIMP测年:早古生代洋壳消减的证据[J].地质学报,2003,77(3):317-327.
[31]李斌,陈井胜,刘淼,等.内蒙古赤峰地区早二叠世花岗岩LA-ICP-MS锆石U-Pb年龄及地球化学特征[J].地质通报,2018,37(9):1671-1681.
[32]Shi Y,Liu D,Miao L,et al.Devonian A-type granitic magmatism on the northern margin of the North China Craton:SHRIMP U-Pb zircon dating and Hf-isotopes of the Hongshan granite at Chifeng,Inner Mongolia,China[J].Gondwana Research,2010,17(4):632-641.
[33]白立兵,李玉玺,刘俊杰.内蒙古满都拉泥盆纪基性火山岩特征及其形成环境[J].华南地质与矿产,2004,(3):50-54.
[34]罗镇宽,苗来成,关康,等.河北张家口水泉沟岩体SHRIMP年代学研究及其意义[J].地球化学,2001,30(2):116-122.(1).125(K50C002004)
(1)中国地质调查局. 1∶25万赤峰市幅(K50C002004)区域地质图及说明书. 2013.
[2]Xiao W J,Windley B F,Hao J,et al.Accretion leading to collision and the Permian Solonker suture,Inner Mongolia,China:Termination of the central Asian orogenic belt[J].Tectonics,2003,22(6):1069-1088.
[3]李锦轶,张进,杨天南,等.北亚造山区南部及其毗邻地区地壳构造分区与构造演化[J].吉林大学学报,2009,39(4):584-605.
[4]Seng?r A M C,Natal’in B A,Burtman V S.Evolution of the Altaid tectoniccollage and Paleozoic crustal growth in Eurasia[J].Nature,1993,364:209-307.
[5]Stampfli G M,Borel G D.A plate tectonic model for the Paleozoic and Mesozoic constrained by dynamic plate boundaries and restored synthetic oceanic isochrones[J].Earth Planet.Sci.Lett.,2002,196:17-33.
[6]刘建峰,李锦轶,迟效国,等.华北克拉通北缘与弧-陆碰撞相关的早泥盆世长英质火山岩-锆石U-Pb定年及地球化学证据[J].地质通报,2013,32(2):267-278.
[7]叶浩,张拴宏,赵越,等.内蒙古赤峰地区泥盆纪晚期火山岩的发现及其地质意义[J].地质通报,2014,33(9):1274-1283.
[8]刘正宏,徐仲元,张超,等.内蒙古白乃庙群形成时代及其构造环境[C]//第六届构造地质与地球动力学学术研讨会摘要集,2013:213-214.
[9]侯可军,李延河,田有荣.LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J].矿床地质,2009,28(4):481-492.
[10]Liu Y,Hu Z,Gao S,et al.In situ,analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,2008,257(1/2):34-43.
[11]Ludwig K R.User’s manual for isoplot 3.00:a geochronological toolkit for Microsoft Execl[J].Berkeley Geochronology Center Special Publication,2003,4:70.
[12]Rollinson H R.The geochemisrty of mafic and ultramafic rocks from the Archaean greenstone belts of Sierra Leone[J].Mineral.Mag.,1983,47:267-280.
[13]Pearce J A,Peate D W.Tectonic implications of the composition of volcanic arc magmas[J].Annu.Rev.Earth Plant.Sci.,1995,23:251-285.
[14]Elliott T,Plank T,Zindler A,et al.Element transport from slab to volcanic front at the Mariana arc[J].Journal of Geophysical Research Atmospheres,1997,1021(B7):14991-15020.
[15]Wilson M.Igneous petrogenesis[M].London:Unwin Hyman,1989:1-466.
[16]Jahn B M,Wu F Y,Lo C H,et al.Crust-mantle interaction induced by deep subduction of the continental crust:geochemical and Sr-Nd isotopic evidence from post-collisional maficultramafic intrusions of the northern Dabie complex,central China[J].Chemical Geology,1999,157:119-146.
[17]Pearce J A.Role of the sub-continental lithosphere in magma genesis at active continental margins[J].Journal of the Electrochemical Society,1983,147(6):2162-2173.
[18]柳长峰,刘文灿,王慧平,等.华北克拉通北缘白乃庙组变质火山岩锆石定年与岩石地球化学特征[J].地质学报,2014,88(7):1273-1287.
[19]Brown G C,Thorpe R S,Webb P C.The geochemical characteristics of granitoids in contrasting arcs and comments on magma sources[J].Journal of the Geological Society,1984,141(3):413-426.
[20]Atherton M P,Petford N.Genetation of sodium-rich magmas from newly underplated basaltic crust[J].Nature,1993,362:144-146.
[21]Pearce J A,Harris N B W,Tindle A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25:956-983.
[22]Zhang W,Jian P,Kr?ner A,et al.Magmatic and metamorphic development of an early to mid-Paleozoic continental margin arc in the southernmost Central Asian Orogenic Belt,Inner Mongolia,China[J].Journal of Asian Earth Sciences,2013,72(4):63-74.
[23]Jian P,Liu D,Kr?ner A,et al.Time scale of an early to midPaleozoic orogenic cycle of the long-lived Central Asian Orogenic Belt,Inner Mongolia of China:Implications for continental growth[J].Lithos,2008,101(3/4):233-259.
[24]张维,简平.内蒙古达茂旗北部早古生代花岗岩类SHRIMP U-Pb年代学[J].地质学报,2008,82(6):778-787.
[25]Zhang S H,Zhao Y,Liu X C,et al.Late Paleozoic to Early Mesozoic mafic-ultramafic complexes from the northern North China Block:Constraints on the composition and evolution of the lithospheric mantle[J].Lithos,2009,110(1):229-246.
[26]Zhang S H,Zhao Y,Song B,et al.Petrogenesis of the Middle Devonian Gushan diorite pluton on the northern margin of the North China block and its tectonic implications[J].Geological Magazine,2007,144(3):16-24.
[27]许立权.内蒙古白云鄂博-满都拉地区加里东期-华力西期-印支期岩浆岩特征与大地构造演化探讨[D].中国地质大学(北京)博士学位论文,2005.
[28]王兴安.华北板块北缘中段早古生代-泥盆纪构造演化[D].吉林大学博士学位论文,2014.
[29]Zhang S H,Zhao Y,Davis G A,et al.Temporal and spatial variations of Mesozoic magmatism and deformation in the North China Craton:Implications for lithospheric thinning and decratonization[J].Earth-Science Reviews,2014,131(4):49-87.
[30]刘敦一,简平,张旗,等.内蒙古图林凯蛇绿岩中埃达克岩SHRIMP测年:早古生代洋壳消减的证据[J].地质学报,2003,77(3):317-327.
[31]李斌,陈井胜,刘淼,等.内蒙古赤峰地区早二叠世花岗岩LA-ICP-MS锆石U-Pb年龄及地球化学特征[J].地质通报,2018,37(9):1671-1681.
[32]Shi Y,Liu D,Miao L,et al.Devonian A-type granitic magmatism on the northern margin of the North China Craton:SHRIMP U-Pb zircon dating and Hf-isotopes of the Hongshan granite at Chifeng,Inner Mongolia,China[J].Gondwana Research,2010,17(4):632-641.
[33]白立兵,李玉玺,刘俊杰.内蒙古满都拉泥盆纪基性火山岩特征及其形成环境[J].华南地质与矿产,2004,(3):50-54.
[34]罗镇宽,苗来成,关康,等.河北张家口水泉沟岩体SHRIMP年代学研究及其意义[J].地球化学,2001,30(2):116-122.(1).125(K50C002004)
(1)中国地质调查局. 1∶25万赤峰市幅(K50C002004)区域地质图及说明书. 2013.