内蒙古牙克石焦子沟岩体锆石U-Pb年龄、地球化学特征及其构造意义
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摘要
对兴蒙造山带北带牙克石地区扎罗木得村附近焦子沟岩体进行了地球化学、LA-ICP-MS U-Pb定年研究,以探讨区域内构造演化。锆石测年结果显示:焦子沟岩体结晶年龄为(347±3.9)Ma,形成于早石炭世初期。焦子沟岩体为低钾准铝质I型花岗岩,化学成分富大离子亲石元素,亏损高场强元素,富集轻稀土,亏损重稀土,指示其岩石主要为形成于俯冲带环境下,是地壳与地幔部分熔融产物。焦子沟岩体的侵位反映了额尔古纳-兴安地块与松嫩地块于早石炭世发生碰撞拼贴,在早石炭世其俯冲带位于牙克石扎罗木得区域。
Studies on geochemistry and LA-ICP-MS U-Pb dating of Jiaozigou granite in Yakeshi area of the northern Xing'anling-Mongolian orogenic belt were carried out,in order to learn that the tectonic evolution in the region.The results of the study showed that,the age of Jiaozigou granite was(347±3.90)Ma,being the time of Early Carboniferous.The granite was low-K and quasi-aluminous "I"-type granite;rich in light REE and large ion stone elements,inadequate in heavy REE and high field strength elements;indicating that the rocks would mainly be formed in the subduction zone environment and might derived form the partial melting products of basaltic lower crust.The emplacement of Jiaozigou intrusion reflects that the collision and collision between Erguna-Xing'an block and Songnen block occurred at the end of Early Carboniferous earlier than that of Early Carboniferous,and the subduction zone of Jiaozigou intrusion was located in Yakeshi area in Early Carboniferous.
Studies on geochemistry and LA-ICP-MS U-Pb dating of Jiaozigou granite in Yakeshi area of the northern Xing'anling-Mongolian orogenic belt were carried out,in order to learn that the tectonic evolution in the region.The results of the study showed that,the age of Jiaozigou granite was(347±3.90)Ma,being the time of Early Carboniferous.The granite was low-K and quasi-aluminous "I"-type granite;rich in light REE and large ion stone elements,inadequate in heavy REE and high field strength elements;indicating that the rocks would mainly be formed in the subduction zone environment and might derived form the partial melting products of basaltic lower crust.The emplacement of Jiaozigou intrusion reflects that the collision and collision between Erguna-Xing'an block and Songnen block occurred at the end of Early Carboniferous earlier than that of Early Carboniferous,and the subduction zone of Jiaozigou intrusion was located in Yakeshi area in Early Carboniferous.
引文
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[17]孙德有,吴福元,李惠民,等.小兴安岭西北部造山后A型花岗岩的时代及与索伦山-贺根山-扎赉特碰撞拼合带东延的关系[J].科学通报,2000(20):2217-2222.
[2]李锦轶,莫申国,和政军,等.大兴安岭北段地壳左行走滑运动的时代及其对中国东北及邻区中生代以来地壳构造演化重建的制约[J].地学前缘,2004,(3):157-168.
[3]杨文麟,骆满生,王成刚,等.兴蒙造山系新元古代-古生代沉积盆地演化[J].地球科学(中国地质大学学报),2014,39(8):1155-1168.
[4]张渝金,张超,吴新伟,等.大兴安岭北段扎兰屯地区晚古生代海相火山岩年代学和地球化学特征及其构造意义[J].地质学报,2016,90(10):2706-2720.
[5]内蒙古自治区地质矿产局.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社,2008.
[6]MIDDLEMOST E A K.Naming materials in the magma/igneous rock system[J].Earth Science Reviews,1994,37(3/4):215-224.
[7]PECCERILLO A,TAYLOR S R.Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area,northern Turkey[J].Contributions to Mineralogy and Petrology,1976,58(1):63-81.
[8]COLLINS W J,BEAMS S D,WHITE A J R,et al.Nature and origin of a-type granites with particular reference to southeastern Australia[J].Contributions to Mineralogy and Petrology,1982,80(2):189-200.
[9]SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[C]//SAUNDERS A D,NORRY M J.Magmatism in ocean basins,Geol.Soc.London.Spec.Pub.,1989,42,313-345.
[10]赵芝,迟效国,刘建峰,等.内蒙古牙克石地区晚古生代弧岩浆岩:年代学及地球化学证据[J].岩石学报,2010,26(11):3245-3258.
[11]周长勇,吴福元,葛文春,等.大兴安岭北部塔河堆晶辉长岩体的形成时代、地球化学特征及其成因[J].岩石学报,2005(3):763-775.
[12]PITCHER W S.Granite type and tectonic environment[M].Mountain Building Processes,1983.
[13]陈斌,翟明国,邵济安.太行山北段中生代岩基的成因和意义:主要和微量元素地球化学证据[J].中国科学:D辑 地球科学,2002(11):896-907.
[14]葛文春,吴福元,周长勇,等.大兴安岭中部乌兰浩特地区中生代花岗岩的锆石U-Pb年龄及地质意义[J].岩石学报,2005,(3):749-762.
[15]内蒙古自治区地质矿产局.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社,2008.
[16]张彦龙,赵旭晁,葛文春,等.大兴安岭北部塔河花岗杂岩体的地球化学特征及成因[J].岩石学报,2010,26(12):3507-3520.
[17]孙德有,吴福元,李惠民,等.小兴安岭西北部造山后A型花岗岩的时代及与索伦山-贺根山-扎赉特碰撞拼合带东延的关系[J].科学通报,2000(20):2217-2222.