新疆四顶黑山花岗岩体锆石LA-ICP-MS U-Pb年龄及地质意义
|
摘要
新疆东天山位于中亚造山带南缘,天山—兴安造山系北天山造山带东段,发育大量泥盆纪—石炭纪花岗岩,其形成过程多与觉罗塔格洋的俯冲作用有关。四顶黑山花岗岩体位于东天山觉罗塔格构造岩浆带的东端,岩体在地表呈不规则状产出,侵位于元古界片岩-变火山岩、奥陶系变玄武岩和泥盆系雀儿山群火山岩;主要岩石类型为花岗岩和花岗闪长岩。花岗岩的LA-ICP-MS锆石U-Pb年龄为380.4 Ma±3.7 Ma,表明岩体形成于晚泥盆世。岩石表现出高硅(w(SiO_2)=64.87%~74.71%)、高碱(w(K_2O)=3.35%~4.68%,w(Na_2O)=2.26%~3.85%)、富铝(w(Al_2O_3)=11.82%~14.13%)和低MgO(w(MgO)=0.56%~2.12%)、CaO(w(CaO)=1.68%~3.74%)、TiO_2(w(TiO_2)=0.26%~0.57%)、P_2O_5(w(P_2O5)=0.01%~0.19%)特征,A/CNK=0.83~1.00;富集Ba、K、La、Ce、Nd,亏损Th、Nb、Ta、Sr、Ti,铕负异常较明显(δEu=0.70~0.73);具有岛弧型花岗岩特征。四顶黑山花岗岩体形成于岛弧环境,属于觉罗塔格洋向南俯冲过程中的产物。四顶黑山花岗岩体两侧的镁铁-超镁铁质岩体的形成时代应晚于晚泥盆世。
The east Tianshan orogenic belt,Xinjiang,NW China,is located at east part of the north orogenic belt of Tianshan-Xinganling orogenic system in the south margin of the Central Asian Orogenic Belt(CAOB).The Jueluotage palaeoocean crust subduction-related Devonian-Carboniferous granites are well developed here.The Sidingheishan granitic pluton in the eastern part of the Jueluotage tectonic belt,east Tiuanshan emplaced in Proterozoic shist and metavolcanic rocks,Ordovician metabasalt and Devonian volcanic-sedimentary rocks of the Que'rshan group and outcrops irregularly at surface.It is composed mainly of granite and granodiorite.The LA-ICP-MS zircon U-Pb dating of the granite is 380.4±3.73 Ma reflecting that the it was formed at late Devonian period.Petrological and geochemical data show that the pluton is characterized by high silicon(w(SiO_2)=64.87% ~74.71%),high alkali(w(K_2O)=3.35% ~4.68%,w(Na_2O)=2.26%~3.85%),abundant aluminum(w(Al_2O_3)=11.82%~14.13%)and low MgO(w(MgO)=0.56%~2.12%),CaO(w(CaO)=1.68%~3.74%),TiO_2(w(TiO_2)=0.26%~0.57%),P_2O_5(w(P_2O5)=0.01%~0.19%),ratio of A/CNK=0.83~1.00.enrichment of Ba,K,La,Ce,Nd,depletion in Th,Nb,Ta,Sr and Ti,and lowδEu value(δEu=0.70~0.73).All of these show that the Sidingheishan granitic pluton fromed in the island arc environment and related with the S-dipping subduction of the Jueluotage palaeoocean.The mafic-ultramafic intrusion on either side of the granitic pluton should be formed after the late Devonian.
The east Tianshan orogenic belt,Xinjiang,NW China,is located at east part of the north orogenic belt of Tianshan-Xinganling orogenic system in the south margin of the Central Asian Orogenic Belt(CAOB).The Jueluotage palaeoocean crust subduction-related Devonian-Carboniferous granites are well developed here.The Sidingheishan granitic pluton in the eastern part of the Jueluotage tectonic belt,east Tiuanshan emplaced in Proterozoic shist and metavolcanic rocks,Ordovician metabasalt and Devonian volcanic-sedimentary rocks of the Que'rshan group and outcrops irregularly at surface.It is composed mainly of granite and granodiorite.The LA-ICP-MS zircon U-Pb dating of the granite is 380.4±3.73 Ma reflecting that the it was formed at late Devonian period.Petrological and geochemical data show that the pluton is characterized by high silicon(w(SiO_2)=64.87% ~74.71%),high alkali(w(K_2O)=3.35% ~4.68%,w(Na_2O)=2.26%~3.85%),abundant aluminum(w(Al_2O_3)=11.82%~14.13%)and low MgO(w(MgO)=0.56%~2.12%),CaO(w(CaO)=1.68%~3.74%),TiO_2(w(TiO_2)=0.26%~0.57%),P_2O_5(w(P_2O5)=0.01%~0.19%),ratio of A/CNK=0.83~1.00.enrichment of Ba,K,La,Ce,Nd,depletion in Th,Nb,Ta,Sr and Ti,and lowδEu value(δEu=0.70~0.73).All of these show that the Sidingheishan granitic pluton fromed in the island arc environment and related with the S-dipping subduction of the Jueluotage palaeoocean.The mafic-ultramafic intrusion on either side of the granitic pluton should be formed after the late Devonian.
引文
[1]秦克章,丁奎首,许英霞,等.东天山图拉尔根、白石泉铜镍钴矿床钴、镍赋存状态及原岩含矿性研究[J].矿床地质,2007,26(1):1-14.
[2]李春昱,王荃,刘雪亚,等.亚洲大地构造图及其说明书[M].北京:地图出版社,1982:1-49.
[3]秦克章,方同辉,王书来,等.东天山板块构造分区、演化与成矿地质背景研究[J].新疆地质,2002,20(4):302-308.
[4]李锦轶,王克卓,李文铅,等.东天山晚古生代以来大地构造与矿产勘查[J].新疆地质,2002,20(4):295-301.
[5]王润民,刘德权,殷定泰,等.新疆哈密土墩—黄山一带铜镍硫化物矿床成矿控制条件及找矿方向的研究[J].矿物岩石,1987,7(1):1.178.
[6]钱壮志,孙涛,汤中立,等.东天山黄山东铜镍矿床铂族元素地球化学特征及其意义[J].地质论评,2009,55(6):873-884.
[7]孙涛,钱壮志,汤中立,等.新疆葫芦铜镍矿床锆石U-Pb年代学、铂族元素地球化学特征及其地质意义[J].岩石学报,2010,26(11):3339-3349.
[8]Qin K Z,Su B X,Sakyi P A,et al.SIMS zircon U-Pb geochronology and Sr-Nd isotopes of Ni-Cu-bearing mafic-ultramafic intrusions in eastern Tianshan and Beishan in correlation with flood basalts in Tarim Basin(NW China):constraints on a ca.280 Ma mantle plume[J].American Journal of Science,2011,311:237-260.
[9]Tang D M,Qin K Z,Li C,et al.Zircon dating,Hf-Sr-Nd-Os isotopes and PGE geochemistry of the Tianyu sulfide-bearing mafic-ultramafic intrusion in the Central Asian Orogenic Belt,NW China[J].Lithos,2011,126:84-98.
[10]Sun T,Qian Z Z,Deng Y F,et al.PGE and isotope(Hf-SrNd-Pb)constraints on the origin of the Huangshandong magmatic Ni-Cu sulfide deposit in the Central Asian Orogenic Belt,NW China[J].Economic Geology,2013,108:1849-1864.
[11]Sun T,Wang D H,Qian Z Z,et al.A preliminary review of the metallogenic regularity of nickel deposits in China[J].Acta Geologica Sinica(English Edition),2015,89(4):1375-1397.
[12]刘德权,陈毓川,王登红,等.土屋—延东铜钼矿田与成矿有关问题的讨论[J].矿床地质,2003,22(4):334-344.
[13]吴华,李华芹,陈富文,等.东天山哈密地区赤湖钼铜矿区斜长花岗斑岩锆石SHRIMP U-Pb年龄[J].地质通报,2006,25(5):549-552.
[14]周涛发,袁峰,张达玉,等.新疆东天山觉罗塔格地区花岗岩类年代学、构造背景及其成矿作用研究[J].岩石学报,2010,26(2):478-502.
[15]Yuan C,Sun M,Wilde S,et al.Post-collisional plutons in the Balikun area,East Chinese Tianshan:Evolving magmatism in response to extension and slab break-off[J].Lithos,2010,119:269-288.
[16]Ma X,Shu L,Meert J G.Early Permian slab breakoff in the Chinese Tianshan belt inferred from the post-collisional granitoids[J].Gondwana Research,2013,http://dx.doi.org/10.1016/j.gr.2013.09.018.
[17]Mao Q,Xiao W,Fang T,et al.Geochronology,geochemistry and petrogenesis of Early Permian alkaline magmatism in the Eastern Tianshan:Implications for tectonics of the Southern Altaids[J].Lithos,2014,190-191:37-51.
[18]徐兴旺,秦克章,三金柱,等.东天山四顶黑山地区545 Ma层状镁铁质-超镁铁质岩体的发现及其大地构造学和成矿学意义[J].岩石学报,2006,22(11):2665-2676.
[19]代文军.甘肃北山四顶黑山镁铁、超镁铁质岩地球化学特征及其地质意义[J].甘肃地质,2010,19(2):8-17.
[20]李奇祥,廖群安,三金柱,等.新疆哈密四顶黑山地区镁铁质-超镁铁岩特征及其构造意义[J].地质科技情报,2010,29(4):14-20.
[21]孙涛,钱壮志,汤中立,等.东天山四顶黑山层状岩体地质特征及成矿潜力分析[J].地球学报,2012,33(1):38-48.
[22]王国强,李向民,徐学义,等.甘肃新疆交界地区四顶黑山镁铁质-超镁铁质岩的锆石U-Pb年龄及地质意义[J].地质通报,2012,31(12):2046-2051.
[23]施文翔,廖群安,李奇祥,等.东天山东段四顶黑山一带早泥盆世岛弧花岗岩年龄、特征及构造意义[J].新疆地质,2015,33(1):21-26.
[24]侯可军,李延河,田有荣.LA-MC-ICP-MS锆石微区原位UPb定年技术[J].矿床地质,2009,28(4):481-492.
[25]Peccerillo R,Taylor S R.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,northern Turkey[J].Contributions to Mineralogy and Petrology,1976,58:63-81.
[25]陈玉良,康文彬,梅华平,等.甘肃北山北部红石山地区泥盆系雀儿山群火山岩地球化学特征及构造环境分析[J].西北地质,2015,48(4):50-60.
[27]Anders E,Grevesse N.Abundances of the elements:meteoritic and solar[J].Geochimica et Cosmochimica Acta,1989,53:197-214.
[28]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[C]∥Saunder A D,Norry M J(eds.).Magmatism in the ocean basins,Geological Society Publication,1989,42:313-345.
[29]李亚萍,孙桂华,李锦轶,等.吐哈盆地东缘泥盆纪花岗岩的确定及其地质意义[J].地质通报,2006,25(8):932-936.
[30]宋彪,李文铅.吐哈盆地南缘克孜尔卡拉萨依和大南湖花岗质岩基锆石SHRIMP定年及其地质意义[J].新疆地质,2002,20(4):342-345.
[31]朱増伍,毛归来,吴丽云,等.东天山阿齐山地区石炭纪汇宇岛弧花岗岩的厘定及意义[J].陕西地质,2006,24(1):27-36.
[32]李文铅,夏斌,王克卓,等.新疆东天山彩中花岗岩体锆石SHRIMP年龄及地球化学特征[J].地质学报,2006,80(1):43-52.
[33]吴昌志.张遵忠,Khin Z,等.东天山觉罗塔格红云滩花岗岩年代学、地球化学及其构造意义[J].岩石学报,2006,22(5):1121-1134.
[34]吴华.东天山地壳演化及内生金属成矿作用[D].北京:中国地质大学(北京),2006,1-158.
[35]王京彬,王玉往,何志军.东天山大地构造演化的成矿示踪[J].中国地质,2006,33(3):461-467.
[36]顾连兴,张遵忠,吴昌志,等.关于东天山花岗岩与陆壳垂向增生的若干认识[J].岩石学报,2006,22(5):1103-1120.
[2]李春昱,王荃,刘雪亚,等.亚洲大地构造图及其说明书[M].北京:地图出版社,1982:1-49.
[3]秦克章,方同辉,王书来,等.东天山板块构造分区、演化与成矿地质背景研究[J].新疆地质,2002,20(4):302-308.
[4]李锦轶,王克卓,李文铅,等.东天山晚古生代以来大地构造与矿产勘查[J].新疆地质,2002,20(4):295-301.
[5]王润民,刘德权,殷定泰,等.新疆哈密土墩—黄山一带铜镍硫化物矿床成矿控制条件及找矿方向的研究[J].矿物岩石,1987,7(1):1.178.
[6]钱壮志,孙涛,汤中立,等.东天山黄山东铜镍矿床铂族元素地球化学特征及其意义[J].地质论评,2009,55(6):873-884.
[7]孙涛,钱壮志,汤中立,等.新疆葫芦铜镍矿床锆石U-Pb年代学、铂族元素地球化学特征及其地质意义[J].岩石学报,2010,26(11):3339-3349.
[8]Qin K Z,Su B X,Sakyi P A,et al.SIMS zircon U-Pb geochronology and Sr-Nd isotopes of Ni-Cu-bearing mafic-ultramafic intrusions in eastern Tianshan and Beishan in correlation with flood basalts in Tarim Basin(NW China):constraints on a ca.280 Ma mantle plume[J].American Journal of Science,2011,311:237-260.
[9]Tang D M,Qin K Z,Li C,et al.Zircon dating,Hf-Sr-Nd-Os isotopes and PGE geochemistry of the Tianyu sulfide-bearing mafic-ultramafic intrusion in the Central Asian Orogenic Belt,NW China[J].Lithos,2011,126:84-98.
[10]Sun T,Qian Z Z,Deng Y F,et al.PGE and isotope(Hf-SrNd-Pb)constraints on the origin of the Huangshandong magmatic Ni-Cu sulfide deposit in the Central Asian Orogenic Belt,NW China[J].Economic Geology,2013,108:1849-1864.
[11]Sun T,Wang D H,Qian Z Z,et al.A preliminary review of the metallogenic regularity of nickel deposits in China[J].Acta Geologica Sinica(English Edition),2015,89(4):1375-1397.
[12]刘德权,陈毓川,王登红,等.土屋—延东铜钼矿田与成矿有关问题的讨论[J].矿床地质,2003,22(4):334-344.
[13]吴华,李华芹,陈富文,等.东天山哈密地区赤湖钼铜矿区斜长花岗斑岩锆石SHRIMP U-Pb年龄[J].地质通报,2006,25(5):549-552.
[14]周涛发,袁峰,张达玉,等.新疆东天山觉罗塔格地区花岗岩类年代学、构造背景及其成矿作用研究[J].岩石学报,2010,26(2):478-502.
[15]Yuan C,Sun M,Wilde S,et al.Post-collisional plutons in the Balikun area,East Chinese Tianshan:Evolving magmatism in response to extension and slab break-off[J].Lithos,2010,119:269-288.
[16]Ma X,Shu L,Meert J G.Early Permian slab breakoff in the Chinese Tianshan belt inferred from the post-collisional granitoids[J].Gondwana Research,2013,http://dx.doi.org/10.1016/j.gr.2013.09.018.
[17]Mao Q,Xiao W,Fang T,et al.Geochronology,geochemistry and petrogenesis of Early Permian alkaline magmatism in the Eastern Tianshan:Implications for tectonics of the Southern Altaids[J].Lithos,2014,190-191:37-51.
[18]徐兴旺,秦克章,三金柱,等.东天山四顶黑山地区545 Ma层状镁铁质-超镁铁质岩体的发现及其大地构造学和成矿学意义[J].岩石学报,2006,22(11):2665-2676.
[19]代文军.甘肃北山四顶黑山镁铁、超镁铁质岩地球化学特征及其地质意义[J].甘肃地质,2010,19(2):8-17.
[20]李奇祥,廖群安,三金柱,等.新疆哈密四顶黑山地区镁铁质-超镁铁岩特征及其构造意义[J].地质科技情报,2010,29(4):14-20.
[21]孙涛,钱壮志,汤中立,等.东天山四顶黑山层状岩体地质特征及成矿潜力分析[J].地球学报,2012,33(1):38-48.
[22]王国强,李向民,徐学义,等.甘肃新疆交界地区四顶黑山镁铁质-超镁铁质岩的锆石U-Pb年龄及地质意义[J].地质通报,2012,31(12):2046-2051.
[23]施文翔,廖群安,李奇祥,等.东天山东段四顶黑山一带早泥盆世岛弧花岗岩年龄、特征及构造意义[J].新疆地质,2015,33(1):21-26.
[24]侯可军,李延河,田有荣.LA-MC-ICP-MS锆石微区原位UPb定年技术[J].矿床地质,2009,28(4):481-492.
[25]Peccerillo R,Taylor S R.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,northern Turkey[J].Contributions to Mineralogy and Petrology,1976,58:63-81.
[25]陈玉良,康文彬,梅华平,等.甘肃北山北部红石山地区泥盆系雀儿山群火山岩地球化学特征及构造环境分析[J].西北地质,2015,48(4):50-60.
[27]Anders E,Grevesse N.Abundances of the elements:meteoritic and solar[J].Geochimica et Cosmochimica Acta,1989,53:197-214.
[28]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[C]∥Saunder A D,Norry M J(eds.).Magmatism in the ocean basins,Geological Society Publication,1989,42:313-345.
[29]李亚萍,孙桂华,李锦轶,等.吐哈盆地东缘泥盆纪花岗岩的确定及其地质意义[J].地质通报,2006,25(8):932-936.
[30]宋彪,李文铅.吐哈盆地南缘克孜尔卡拉萨依和大南湖花岗质岩基锆石SHRIMP定年及其地质意义[J].新疆地质,2002,20(4):342-345.
[31]朱増伍,毛归来,吴丽云,等.东天山阿齐山地区石炭纪汇宇岛弧花岗岩的厘定及意义[J].陕西地质,2006,24(1):27-36.
[32]李文铅,夏斌,王克卓,等.新疆东天山彩中花岗岩体锆石SHRIMP年龄及地球化学特征[J].地质学报,2006,80(1):43-52.
[33]吴昌志.张遵忠,Khin Z,等.东天山觉罗塔格红云滩花岗岩年代学、地球化学及其构造意义[J].岩石学报,2006,22(5):1121-1134.
[34]吴华.东天山地壳演化及内生金属成矿作用[D].北京:中国地质大学(北京),2006,1-158.
[35]王京彬,王玉往,何志军.东天山大地构造演化的成矿示踪[J].中国地质,2006,33(3):461-467.
[36]顾连兴,张遵忠,吴昌志,等.关于东天山花岗岩与陆壳垂向增生的若干认识[J].岩石学报,2006,22(5):1103-1120.