北山交叉沟石英闪长岩锆石LA-ICP-MS U-Pb年龄及构造意义
|
摘要
北山地区位于华北板块、塔里木板块和哈萨克斯坦板块的交汇地带,构造-岩浆活动强烈。本文对交叉沟石英闪长岩进行了锆石LA-ICP-MS U-Pb定年,获得的加权平均年龄为306.3±1.2 Ma,结果表明岩体形成于晚石炭世。岩石地球化学分析结果显示,SiO2含量为58.67%~63.31%,属于中酸性岩系列,Al2O3含量高(15.20%~17.56%),K2O/Na2O为0.42~0.67,显示了相对富钠、低钾的特征,岩石里特曼指数(σ)为1.13~1.53,A/NCK=0.88~0.96,属于准铝质中钾钙碱性系列;稀土总量较低(平均为81.01×10-6),具有相对平缓的富集轻稀土元素的配分形式和弱的负Eu异常(δEu为0.80~0.93);在微量元素原始地幔标准化蛛网图上,相对富集Rb、Sr、K等大离子亲石元素,亏损Nb、Ta、P和Ti等高场强元素。结合区域地质背景,认为交叉沟石英闪长岩形成的构造背景为陆缘弧,进而认为交叉沟地区在晚石炭世存在洋-陆俯冲作用,而且红石山-百合山-蓬勃山洋完全闭合时限晚于晚石炭世。
Located in the convergence area of North China,Tarim and Kazakhstan plates,the Beishan area has strongly tectonic-magmatic activities.This paper reports a weighted average age of 306.3 1.2Ma using LAICP-MS U-Pb dating for zircons from the quartz diorite in Beishan Mountain,Inner Mongolia.The data show that the pluton was emplaced at late Carboniferous.Lithological and geochemical analysis show that the Jiaochagou quartz diorite belongs to cal-alkaline series(σ=1.13~1.53)with metaluminous characteristics(A/NCK=0.88~0.96),within higher Al2O3(15.20%~17.56%),Mg#(46.55~49.40)while lower K2O(K2O/Na2O=0.42~0.67).They have a low total REE amount(ave.81.01×10-6)with relatively flat distribution between LREE and HREE and weak negative Eu anomalies(δEu=0.80~0.93)in the chondrite-normalized REE patterns.Trace elements analysis shows depletion of Nb,Ta,P,Ti and enrichment of Rb,Sr and K.Based on the regional geology,the above characteristics reflect that the Jiaochgou quartz diorite was formed under the tectonic setting of continental arc in late Carboniferous.Combining with regional geological settings,this study suggests that quartz diorite in the Jiaochgou area formed in the continental oceanic arc,which indicates the existence of ocean-continent subduction during late Carboniferous.The closure time of the ocean basin represented by the Hongshishan-BaiheshanPengboshan ophiolite mlangen belt was later than late Carboniferous.
Located in the convergence area of North China,Tarim and Kazakhstan plates,the Beishan area has strongly tectonic-magmatic activities.This paper reports a weighted average age of 306.3 1.2Ma using LAICP-MS U-Pb dating for zircons from the quartz diorite in Beishan Mountain,Inner Mongolia.The data show that the pluton was emplaced at late Carboniferous.Lithological and geochemical analysis show that the Jiaochagou quartz diorite belongs to cal-alkaline series(σ=1.13~1.53)with metaluminous characteristics(A/NCK=0.88~0.96),within higher Al2O3(15.20%~17.56%),Mg#(46.55~49.40)while lower K2O(K2O/Na2O=0.42~0.67).They have a low total REE amount(ave.81.01×10-6)with relatively flat distribution between LREE and HREE and weak negative Eu anomalies(δEu=0.80~0.93)in the chondrite-normalized REE patterns.Trace elements analysis shows depletion of Nb,Ta,P,Ti and enrichment of Rb,Sr and K.Based on the regional geology,the above characteristics reflect that the Jiaochgou quartz diorite was formed under the tectonic setting of continental arc in late Carboniferous.Combining with regional geological settings,this study suggests that quartz diorite in the Jiaochgou area formed in the continental oceanic arc,which indicates the existence of ocean-continent subduction during late Carboniferous.The closure time of the ocean basin represented by the Hongshishan-BaiheshanPengboshan ophiolite mlangen belt was later than late Carboniferous.
引文
龚全胜,刘明强,李海林,梁明宏,代文军.2002.甘肃北山造山带类型及基本特征.西北地质,35(3):28~34.
龚全胜,刘明强,梁明宏,李海林.2003.北山造山带大地构造相及构造演化.西北地质,36(1):11~17.
何世平,任秉琛,姚文光,付力浦.2002.甘肃内蒙古北山地区构造单元划分.西北地质,35(4):30~40.
何世平,周会武,任秉琛,姚文光,付力浦.2005.甘肃内蒙古北山地区古生代地壳演化.西北地质,38(3):6~15.
黄增保,金霞.2006.甘肃红石山蛇绿岩地球化学特征及构造环境.地质科学,41(4):601~611.
江思宏,聂凤军.2006.北山地区花岗岩类成因的Nd同位素制约.地质学报,80(6):826~842.
李昌年.1992.火成岩微量元素岩石学.武汉:中国地质大学出版社,97~109.
李景春,赵安生,崔惠文.1996.北山北带地质构造特征.贵金属地质,5(1):59~68.
李舢,王涛,童英,洪大卫,欧阳志侠.2009.北山柳园地区双峰山早泥盆世A型花岗岩的确定及其构造演化意义.岩石矿物学杂志,28(5):407~422.
李向民,余吉远,王国强,武鹏.2012.甘肃北山地区芨芨台子蛇绿岩LA-ICP-MS锆石U-Pb测年及其地质意义.地质通报,31(12):2025~2031.
李再会,林仕良,丛峰,邹光富,谢韬.2010.滇西腾冲-梁河地块石英闪长岩-二长花岗岩锆石U-Pb年龄、Hf同位素特征及其地质意义.地质学报,86(7):1047~1062.
刘峰,杨富全,李延河,郭正林,柴凤梅,耿新霞,张志欣.2010.新疆阿尔泰南缘萨尔布拉克铁矿区花岗岩年代学及地球化学研究.地质学报,84(2):195~205.
刘建峰,迟效国,张兴洲,马志红,赵芝,王铁夫,胡兆初,赵秀羽.2009.内蒙古西乌旗南部石炭纪石英闪长岩地球化学特征及其构造意义.地质学报,82(3):365~376.
刘翼飞,聂风军,江思宏,席忠,张志刚,肖伟,张可,刘勇.2012.内蒙古查干花钼矿区成矿花岗岩地球化学、年代学及成岩作用.岩石学报,28(2):409~420.
卢进才,牛亚卓,魏仙样,陈高潮,李玉宏.2013.北山红石山地区晚古生代火山岩LA-ICP-MS锆石U-Pb年龄及构造意义.岩石学报,29(8):2685~2694.
内蒙古自治区地质矿产局.1996.内蒙古自治区岩石地层.北京:中国地质大学出版社,42~45.
聂凤军,江思宏,白大明.2002.北山地区金属矿床成矿规律及找矿方向.北京:地质出版社,1~408.
聂凤军,江思宏,白大明,刘妍,张义,赵月明,安存杰,王新亮,苏新旭.2003.蒙甘新相邻(北山)地区金铜矿床时空分布特征及成矿作用.矿床地质,22(3):234~245.
潘桂棠,肖庆辉,陆松年,邓晋福,冯益民,张克信,张智勇,王方国,邢光福,郝国杰,冯艳芳.2009.中国大地构造单元划分.中国地质,36(1):1~28.
王德滋.1999.壳慢作用与花岗岩成因———以中国东南沿海为例.高校地质学报,5(3):241~250.
夏林圻.2001.造山带火山岩浆作用.西北地质,34(3):1~8.
肖庆辉,邓晋福,马大铨.2002.花岗岩研究思维与方法.北京:地质出版社,265~275.
徐学义,何世平,王洪亮.2008.中国西北部地质概论———秦岭、祁连、天山地区.北京:科学出版社.
杨合群,李英,李文明,杨建国,赵国斌,孙南一,王小红,谭文娟.2008.北山成矿构造背景概论.西北地质,41(1):22~28.
杨合群,李英,李文明,杨建国,赵国斌,王小红.2009.北山花岗岩S型/I型空间变化规律及含矿性.地球学报,30(5):627~633.
杨永军,杨高学,李鸿,金朝,葛海影,林列全.2012.新疆伊宁地块晚泥盆世火山岩的确认及其地质意义.岩石学报,28(4):1225~1237.
杨岳清,吕博,孟贵祥,严加永,赵金华,王守光,贾玲珑,韩建刚.2013.内蒙古东七一山花岗岩地球化学、锆石SHRIMP U-Pb年龄及岩体形成环境探讨.地球学报,34(2):163~175.
张智宇,杜杨松,张静,庞振山.2011.安徽贵池铜山岩体SHRIMP锆石U-Pb年代学与岩石地球化学特征研究.地质论评,57(3):366~378.
左国朝,何国琦.1990.北山板块构造及成矿规律.北京:北京大学出版社,1~226.
左国朝,刘春燕,白万成,冯永忠.1995.北山泥盆纪碰撞造山火山-磨拉石地质构造及地球化学特征.甘肃地质学报,4(1):35~44.
左国朝,李茂松.1996.甘蒙北山地区早古生代岩石圈形成和演化.兰州:甘肃科学技术出版社.
左国朝,刘义科,刘春燕.2003.甘新蒙北山地区构造格局及演化.甘肃地质学报,1(12):1~15.
Andersen T.2002.Correction of common lead in U-Pb analyses thatdo not report 204Pb.Chemical Geology,192(1~2):59~79.
Ao S J,Xiao W J,Han C M,Mao Q G,Zhang J E.2010.Geochronology and geochemistry of early Permian maficultramafic complexes in the Beishan area,Xinjiang,NW China:implications for late Paleozoic tectonic evolution of the southernAltaids.Gondwana Research,18:466~478.
Barbarin B.1999.A review of the relationships between granitoidtypes,their origins and their geodynamic environments.Lithos,46:605~626.
Boynton W V.1984.Geochemistry of the rare earth elements:meteorite studies.In:Henderson P.ed.Rare Earth ElementsGeochemistry.Elservier,63~114.
Christopher M F,Keith N S,Robert H R.2003.Detrital zirconanalysis of the sedimentary record.Mineralogy andGeochemistry,53(1):277~303.
Hoskin P W O,Black L P.2000.Metamorphic zircon formation bysolid-state recrystallization of protolith igneous zircon.Journalof Metamorphic Geology,18(4):423~439.
Jan K,Paul J S.2003.Present trends and the future of zircon ingeochronology:laser ablation ICPMS.Mineralogy andGeochemistry,53(1):243~275.
Liu Y S,Hu Z C,Gao S,et al.2008.In situ analysis of major andtrace elements of anhydrous minerals by LA-CIP-MS withoutapplying an internal standard.Chemical Geology,257:34~43.
Ludwing K R.1999.Using Isoplot/Ex Version 2,ageochronological toolkit for Microsoft excel.Berkeley:BerkeleyGeochronological Centre Special Publications,1~47.
McDonough W F,Sun S R,Ringwood A E,Jagoutz E,HoffmannA W.1992.K,Rb and Cs in the earth and moon and theevolution of the earth's mantle.Geochim.et Cosmochim.Acta,56:1001~1012.
Pearce J A,Harris N B W,Tindle A G.1984.Trace elementdiscrimination diagrams for the tectonic interpretationg ofgranitic rocks.Petrol.,25:956~983.
Randall R P,Stephen R N.2003.Zircon U-Th-Pb Geochronologyby isotope dilution-Thermal Ionization Mass Spectrometry.Mineralogy and Geochemistry,53(1):183~213.
Rollinson H R.1993.Using Geochemical Data:Evaluation,Presentation,Interpretation.New York:Longman PublishingGroup,174~206.
Trevor R I,Ian S W.2003.Considerations in zircon geochronologyby SIMS.Mineralogy and Geochemistry,53(1):215~241.
Wyllie P J.1991.Plate tectonics and magma genesis.GeologischeRundschau Baud,70:128~150.
Wyllie P J,Ryabchikov I D.2000.Volatile components,magmasand critical fluids in upwelling mantle.Journal of Petrology,41(7):1195~1206.
甘肃省地质局地质力学区测队.1977.区域地质调查报告,K-47-22 (路井)幅.
龚全胜,刘明强,梁明宏,李海林.2003.北山造山带大地构造相及构造演化.西北地质,36(1):11~17.
何世平,任秉琛,姚文光,付力浦.2002.甘肃内蒙古北山地区构造单元划分.西北地质,35(4):30~40.
何世平,周会武,任秉琛,姚文光,付力浦.2005.甘肃内蒙古北山地区古生代地壳演化.西北地质,38(3):6~15.
黄增保,金霞.2006.甘肃红石山蛇绿岩地球化学特征及构造环境.地质科学,41(4):601~611.
江思宏,聂凤军.2006.北山地区花岗岩类成因的Nd同位素制约.地质学报,80(6):826~842.
李昌年.1992.火成岩微量元素岩石学.武汉:中国地质大学出版社,97~109.
李景春,赵安生,崔惠文.1996.北山北带地质构造特征.贵金属地质,5(1):59~68.
李舢,王涛,童英,洪大卫,欧阳志侠.2009.北山柳园地区双峰山早泥盆世A型花岗岩的确定及其构造演化意义.岩石矿物学杂志,28(5):407~422.
李向民,余吉远,王国强,武鹏.2012.甘肃北山地区芨芨台子蛇绿岩LA-ICP-MS锆石U-Pb测年及其地质意义.地质通报,31(12):2025~2031.
李再会,林仕良,丛峰,邹光富,谢韬.2010.滇西腾冲-梁河地块石英闪长岩-二长花岗岩锆石U-Pb年龄、Hf同位素特征及其地质意义.地质学报,86(7):1047~1062.
刘峰,杨富全,李延河,郭正林,柴凤梅,耿新霞,张志欣.2010.新疆阿尔泰南缘萨尔布拉克铁矿区花岗岩年代学及地球化学研究.地质学报,84(2):195~205.
刘建峰,迟效国,张兴洲,马志红,赵芝,王铁夫,胡兆初,赵秀羽.2009.内蒙古西乌旗南部石炭纪石英闪长岩地球化学特征及其构造意义.地质学报,82(3):365~376.
刘翼飞,聂风军,江思宏,席忠,张志刚,肖伟,张可,刘勇.2012.内蒙古查干花钼矿区成矿花岗岩地球化学、年代学及成岩作用.岩石学报,28(2):409~420.
卢进才,牛亚卓,魏仙样,陈高潮,李玉宏.2013.北山红石山地区晚古生代火山岩LA-ICP-MS锆石U-Pb年龄及构造意义.岩石学报,29(8):2685~2694.
内蒙古自治区地质矿产局.1996.内蒙古自治区岩石地层.北京:中国地质大学出版社,42~45.
聂凤军,江思宏,白大明.2002.北山地区金属矿床成矿规律及找矿方向.北京:地质出版社,1~408.
聂凤军,江思宏,白大明,刘妍,张义,赵月明,安存杰,王新亮,苏新旭.2003.蒙甘新相邻(北山)地区金铜矿床时空分布特征及成矿作用.矿床地质,22(3):234~245.
潘桂棠,肖庆辉,陆松年,邓晋福,冯益民,张克信,张智勇,王方国,邢光福,郝国杰,冯艳芳.2009.中国大地构造单元划分.中国地质,36(1):1~28.
王德滋.1999.壳慢作用与花岗岩成因———以中国东南沿海为例.高校地质学报,5(3):241~250.
夏林圻.2001.造山带火山岩浆作用.西北地质,34(3):1~8.
肖庆辉,邓晋福,马大铨.2002.花岗岩研究思维与方法.北京:地质出版社,265~275.
徐学义,何世平,王洪亮.2008.中国西北部地质概论———秦岭、祁连、天山地区.北京:科学出版社.
杨合群,李英,李文明,杨建国,赵国斌,孙南一,王小红,谭文娟.2008.北山成矿构造背景概论.西北地质,41(1):22~28.
杨合群,李英,李文明,杨建国,赵国斌,王小红.2009.北山花岗岩S型/I型空间变化规律及含矿性.地球学报,30(5):627~633.
杨永军,杨高学,李鸿,金朝,葛海影,林列全.2012.新疆伊宁地块晚泥盆世火山岩的确认及其地质意义.岩石学报,28(4):1225~1237.
杨岳清,吕博,孟贵祥,严加永,赵金华,王守光,贾玲珑,韩建刚.2013.内蒙古东七一山花岗岩地球化学、锆石SHRIMP U-Pb年龄及岩体形成环境探讨.地球学报,34(2):163~175.
张智宇,杜杨松,张静,庞振山.2011.安徽贵池铜山岩体SHRIMP锆石U-Pb年代学与岩石地球化学特征研究.地质论评,57(3):366~378.
左国朝,何国琦.1990.北山板块构造及成矿规律.北京:北京大学出版社,1~226.
左国朝,刘春燕,白万成,冯永忠.1995.北山泥盆纪碰撞造山火山-磨拉石地质构造及地球化学特征.甘肃地质学报,4(1):35~44.
左国朝,李茂松.1996.甘蒙北山地区早古生代岩石圈形成和演化.兰州:甘肃科学技术出版社.
左国朝,刘义科,刘春燕.2003.甘新蒙北山地区构造格局及演化.甘肃地质学报,1(12):1~15.
Andersen T.2002.Correction of common lead in U-Pb analyses thatdo not report 204Pb.Chemical Geology,192(1~2):59~79.
Ao S J,Xiao W J,Han C M,Mao Q G,Zhang J E.2010.Geochronology and geochemistry of early Permian maficultramafic complexes in the Beishan area,Xinjiang,NW China:implications for late Paleozoic tectonic evolution of the southernAltaids.Gondwana Research,18:466~478.
Barbarin B.1999.A review of the relationships between granitoidtypes,their origins and their geodynamic environments.Lithos,46:605~626.
Boynton W V.1984.Geochemistry of the rare earth elements:meteorite studies.In:Henderson P.ed.Rare Earth ElementsGeochemistry.Elservier,63~114.
Christopher M F,Keith N S,Robert H R.2003.Detrital zirconanalysis of the sedimentary record.Mineralogy andGeochemistry,53(1):277~303.
Hoskin P W O,Black L P.2000.Metamorphic zircon formation bysolid-state recrystallization of protolith igneous zircon.Journalof Metamorphic Geology,18(4):423~439.
Jan K,Paul J S.2003.Present trends and the future of zircon ingeochronology:laser ablation ICPMS.Mineralogy andGeochemistry,53(1):243~275.
Liu Y S,Hu Z C,Gao S,et al.2008.In situ analysis of major andtrace elements of anhydrous minerals by LA-CIP-MS withoutapplying an internal standard.Chemical Geology,257:34~43.
Ludwing K R.1999.Using Isoplot/Ex Version 2,ageochronological toolkit for Microsoft excel.Berkeley:BerkeleyGeochronological Centre Special Publications,1~47.
McDonough W F,Sun S R,Ringwood A E,Jagoutz E,HoffmannA W.1992.K,Rb and Cs in the earth and moon and theevolution of the earth's mantle.Geochim.et Cosmochim.Acta,56:1001~1012.
Pearce J A,Harris N B W,Tindle A G.1984.Trace elementdiscrimination diagrams for the tectonic interpretationg ofgranitic rocks.Petrol.,25:956~983.
Randall R P,Stephen R N.2003.Zircon U-Th-Pb Geochronologyby isotope dilution-Thermal Ionization Mass Spectrometry.Mineralogy and Geochemistry,53(1):183~213.
Rollinson H R.1993.Using Geochemical Data:Evaluation,Presentation,Interpretation.New York:Longman PublishingGroup,174~206.
Trevor R I,Ian S W.2003.Considerations in zircon geochronologyby SIMS.Mineralogy and Geochemistry,53(1):215~241.
Wyllie P J.1991.Plate tectonics and magma genesis.GeologischeRundschau Baud,70:128~150.
Wyllie P J,Ryabchikov I D.2000.Volatile components,magmasand critical fluids in upwelling mantle.Journal of Petrology,41(7):1195~1206.
甘肃省地质局地质力学区测队.1977.区域地质调查报告,K-47-22 (路井)幅.