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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 预览

Zircon U-Pb ages and geochemical characteristics of the granite in Yakeshi,Inner Mongolia and its geotectonic significance
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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-MSU-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.
作者 董运如 董化祥 谢祥 赵凯 陈勇 陈宇 董寒杰 DONG Yunru;DONG Huaxiang;XIE Xiang;ZHAO Kai;CHEN Yong;CHEN Yu;DONG Hanjie(Henan Non-ferrous Metals Mineral Exploration Engineering Technology Research Center,Zhengzhou 450016,Henan,China;The Sixth Geological Unit Team of Henan Non-ferrous Metals Geologicaland Mineral Resources Bureau,Zhengzhou 450016,Henan,China;The First Geological Unit Team of Henan Non-ferrous Geological and Mineral Resources Bureau,Zhongzhou 450016,Henan,China)
出处 《矿产与地质》 2019年第1期106-113,共8页 Mineral Resources and Geology
基金 内蒙古基金中心矿调项目“内蒙古自治区呼伦贝尔市扎罗木得等三幅1∶5万区域矿产地质调查”(项目编号:﹝2015﹞矿调-25)资助。
关键词 锆石U-PB年龄 地球化学 花岗岩 焦子沟岩体 早石炭世 牙克石地区 Zircon U-Pb age Geochemistry granite Jiaozigou rocks Early Carboniferous Yakeshi area
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