阿尔泰库尔干巴斯岩体LA-ICP-MS锆石U-Pb定年及地质意义
LA-ICP-MS zircon U-Pb dating and geological significance of the Altai Kurganbas rock mass
投稿时间:2019-06-04  修订日期:2019-06-14
DOI:
中文关键词:  阿尔泰南缘  库尔干巴斯岩体  地球化学  俯冲消减环境
英文关键词:The Southern margin of Altay  Kuerganbas rock mass  Geochemistry  Dive reduction environment
基金项目:国家自然科学基金资助项目 (41462004)和新疆维吾尔自治区地质勘查(A16-1-LQ09)
           
作者单位
齐锐 新疆大学 地质与矿业工程学院
弓小平 新疆大学 地质与矿业工程学院
俞帅一 新疆大学 地质与矿业工程学院
孙乾龙 新疆大学 地质与矿业工程学院
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中文摘要:
      新疆福海县默色克奥依一带1∶5万区域地质矿产调查在阿尔泰南缘新发现库尔干巴斯花岗岩体,为探讨其岩石成因、形成时代以及构造环境本文开展了LA-ICP-MS锆石U-Pb定年和岩石地球化学研究。结果显示: U-Pb锆石年龄为391.4±4.0Ma(MSWD=0.96).形成时代为中泥盆世,库尔干巴斯花岗岩体属于高钾钙碱性弱过铝质花岗岩、SiO2含量为(62.73%-74.75%),TiO2 含量为(0.32%-0.90%),Na2O含量为(3.06%-5.02%),K2O含量为(3.37%-4.1%),P2O5含量为(0.01%-0.19%),Al2O3含量为(12.38%-16.00%)。高硅、高碱、富铝、低钛、低磷特征,微量元素显示LREE富集且分馏明显,HREE亏损,中等的Eu负异常(δEu=0.41-0.98), 富集Rb、Th、K、La,亏损Ba、Nb、P、Ti的特征,结合区域研究资料和前人研究成果,本文认为库尔干巴斯岩体形成于俯冲消减有关的火山岛弧环境,是哈萨克斯坦-准噶尔板块再次向阿尔泰地块俯冲消减的产物,为该区域构造演化划分提供了新的证据。
英文摘要:
      A 1:50,000 regional geological mineral survey in the Mosike Oyi area of Fuhai County, Xinjiang, newly discovered the Kurganbas granite in the southern margin of Altai. In order to explore its petrogenesis, formation age and tectonic setting, LA-ICP-MS zirconium was developed. Stone U-Pb dating and rock geochemistry research. The results show that the age of U-Pb zircon is 391.4±4.0Ma (MSWD=0.096). The formation period is Middle Devonian. The Kurganbus granite is a high-potassium-calcium-alkali weak aluminous granite with SiO2 content ( 62.73%-74.75%), TiO2 content is (0.32%-0.9%), Na2O content is (3.06%-5.02%), K2O content is (3.37%-4.1%), P2O5 content is (0.01%-0.19%) The content of Al2O3 is (12.38%-16.00%). High silicon, high alkali, aluminum rich, low titanium, low phosphorus characteristics, trace elements show LREE enrichment and fractionation, HREE loss, medium Eu negative anomaly (δEu=0.41-0.98), enrichment of Rb, Th, K, La, the characteristics of loss of Ba, Nb, P, Ti, combined with regional research data and previous research results, this paper believes that the Kurgbas hydromass formed in the volcanic island arc environment related to subduction and reduction, is the Kazakhstan-Junggar plate again .The product of subduction and subsidence of the Altai block provides new evidence for the tectonic evolution of the area.
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