哈尔里克山古生代火山岩地质特征及构造意义

The Geologic Character and Tectonic Significance of Paleozoic Volcanic Rocks in the Harlik Mountains,Xinjiang

通过对哈尔里克山地区火山岩岩性、岩相、岩石地球化学分析,确定研究区古生代火山岩可分为奥陶—泥盆纪钙碱性中基性火山岩建造,石炭纪为钙碱性中酸性火山岩建造,火山岩主要属钙碱性系列。岩类、岩相与岩石地球化学特征表明,本区火山岩在奥陶—泥盆纪为岛弧环境,随着吐哈盆地南缘活动陆缘逐渐向南迁移,石炭—二叠纪研究区变为弧后环境,研究区南侧存在泥盆—石炭纪向北俯冲的洋盆。

Through the analysis of volcanics＇ lithology, lithofacies and rock geochemistry in Harlik area,to determine the Ordovician , Silurian and Devonian volcanic rocks combination is basalts-andesites-rhyolites, the Carboniferous vol- canics combination is andesites-dacites-rhyolites, basalts-rhyolites is Pennain volcanic combination .The volcanics are mainly calc-alkalic series.Based on lithology,lithofacies and rock geochemistry characteristic indicate,volcanic rocks are tbnning in arc island setting at Ordovician-Devonian,with the active continental margin at southern sdge of Turpan-Ha- rain basin was southward migration,the Harlik area become back arc setting.South of Harlik area exist northwards sub- ducted ocean basin at Devonian-Carboniferous.