内蒙古西乌旗石匠山晚侏罗世——早白垩世A型花岗岩锆石U-Pb年龄及构造环境
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摘要
内蒙古西乌旗石匠山A型花岗岩位于贺根山缝合带内,侵位于早石炭世迪彦庙-白音布拉格蛇绿岩带和下二叠统寿山沟组与大石寨组中,岩性为二长花岗岩。石匠山A型花岗岩富硅(SiO_2=74.18%~77.16%)、富钾(K_2O=4.31%~5.07%)、富碱(Na_2O+K_2O=8.44%~9.16%),贫Al_2O_3、CaO、MgO、TiO_2、P_2O_5、Sr、Ba、Eu、Ti和P,具有较高的Ga/Al(3.98~6.09)、(Na_2O+K2O)/CaO、K_2O/MgO、TFeO/MgO、Rb/Nb、Y/Nb、Sc/Nb值,稀土元素配分曲线为典型的海鸥式分布,δEu为0.01~0.19,负Eu异常显著,明显不同于I、S和M型花岗岩,为典型的铝质A型花岗岩。在地球化学分类判别图解上,石匠山A型花岗岩显示A_2型后造山铝质花岗岩特征,反映其形成于后造山伸展环境。LA-ICP-MS锆石U-Pb测年结果表明,该花岗岩的侵位年龄为159.8±1.3Ma、143.1±1.3Ma、136.20±0.69Ma,即形成时代为晚侏罗世-早白垩世,揭示贺根山缝合带在晚侏罗世-早白垩世为后造山伸展阶段。
Lying along the Hegenshan collisional orogenic suture zone in Xi Ujimqin Banner of Inner Mongolia, the Shijiangshan Atype granite intruded into Early Carboniferous Diyanmiao-Baiyinbulage ophiolite as well as Early Permian Shoushangou Formation and Dashizhai Formation, and consists mainly of monzogranites. The granite is geochemically characterized by high SiO_2(74.18%~77.16%), K_2O(4.31%~5.07%), high absolute alkali values(Na_2O+K_2O=8.44%~9.16%), low Al_2O_3, CaO, MgO, TiO_2, P_2O_5, Sr, Ba,Eu, Ti, P values, and higher Ga/Al(3.98~6.09),(Na_2O+K_2O)/CaO, K_2O/MgO, TFeO/MgO, Rb/Nb, Y/Nb, Sc/Nb ratios. It is characterized by typical flat or slight right-inclined gull-wing shaped REE distribution patterns with obvious negative Eu anomalies(δEu=0.01~0.19). The Shijiangshan monzogranite exhibits typical geochemical characteristics of A-type granite, being significantly different from I, S and M type granites in geochemistry. According to the chemical subdivision diagrams of the A-type granitoids, the Shijiangshan A-type granite belongs to aluminous A_2-type granitoid, formed and emplaced in a post-orogenic extension setting. LAICP-MS zircon U-Pb dating shows that the ages of the granite are 159.8±1.3 Ma, 143.1±1.3 Ma and 136.20±0.69 Ma, suggesting that it was produced during Late Jurassic to Early Cretaceous and that the Hegenshan suture zone was at the post orogenic extension stage in the Late Jurassic-Early Cretaceous period.
Lying along the Hegenshan collisional orogenic suture zone in Xi Ujimqin Banner of Inner Mongolia, the Shijiangshan Atype granite intruded into Early Carboniferous Diyanmiao-Baiyinbulage ophiolite as well as Early Permian Shoushangou Formation and Dashizhai Formation, and consists mainly of monzogranites. The granite is geochemically characterized by high SiO_2(74.18%~77.16%), K_2O(4.31%~5.07%), high absolute alkali values(Na_2O+K_2O=8.44%~9.16%), low Al_2O_3, CaO, MgO, TiO_2, P_2O_5, Sr, Ba,Eu, Ti, P values, and higher Ga/Al(3.98~6.09),(Na_2O+K_2O)/CaO, K_2O/MgO, TFeO/MgO, Rb/Nb, Y/Nb, Sc/Nb ratios. It is characterized by typical flat or slight right-inclined gull-wing shaped REE distribution patterns with obvious negative Eu anomalies(δEu=0.01~0.19). The Shijiangshan monzogranite exhibits typical geochemical characteristics of A-type granite, being significantly different from I, S and M type granites in geochemistry. According to the chemical subdivision diagrams of the A-type granitoids, the Shijiangshan A-type granite belongs to aluminous A_2-type granitoid, formed and emplaced in a post-orogenic extension setting. LAICP-MS zircon U-Pb dating shows that the ages of the granite are 159.8±1.3 Ma, 143.1±1.3 Ma and 136.20±0.69 Ma, suggesting that it was produced during Late Jurassic to Early Cretaceous and that the Hegenshan suture zone was at the post orogenic extension stage in the Late Jurassic-Early Cretaceous period.
引文
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[13]张晓晖,张宏福,汤艳杰,等.内蒙古中部锡林浩特-西乌旗早三叠世A型酸性火山岩的地球化学特征及其地质意义[J].岩石学报,2006,22(11):2769-2780.
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[17]石玉若,刘敦一,张旗,等.内蒙古中部苏尼特左旗地区三叠纪A型花岗岩锆石SHRIMP U-Pb年龄及其区域构造意义[J].地质通报,2007,26(2):183-189.
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[19]薛富红,张晓晖,邓江夏,等.内蒙古中部达来地区晚侏罗世A型花岗岩:地球化学特征、岩石成因与地质意义[J].岩石学报,2015,31(6):1774-1788.
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[28]李竞妍,郭锋,李超文,等.东北地区晚古生代—中生代I型和A型花岗岩Nd同位素变化趋势及其构造意义[J].岩石学报,2014,30(7):1995-2008.
[29]李英杰,王金芳,李红阳,等.内蒙西乌旗白音布拉格蛇绿岩地球化学特征[J].岩石学报,2013,29(8):2719-2730.
[30]陈斌,赵国春,Simon Wilde.内蒙古苏尼特左旗南两类花岗岩同位素年代学及其构造意义[J].地质论评,2001,47(4):361-367.
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[32]Miao L,Shi Y,Guo F,et al.Geochronology and geochemistry of the Hegenshan ophiolitic complex:Implications for late-stage tectonic evolution of the Inner Mongolia-Daxinganling Orogenic Belt,China[J].Journal of Asian Earth Sciences,2008,32(4):404-415.
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