地质与资源2011，Vol.20Issue(3)：161-166,6.
内蒙古哈马尔乌拉花岗斑岩的锆石U-Pb定年及其岩石地球化学特征
ZIRCON U-Pb AGES AND GEOCHEMICAL CHARACTERISTICS OF THE HAMAERWULA PLUTON IN INNER MONGOLIA
摘要
Abstract
The Hamaerwula granite-porphyry, outcropping in the eastern slope of the middle section of Daxinganling Mountains, was formed in Early Cretaceous. The U -Pb isochron dating of zircon shows that the weighted average of apparent age is 124.9±2.5 Ma, representing the intrusion era of Hamaerwula pluton. The chemical composition of the rock reveals high SiO2 (71.262% - 77.61%, averagely 74.48%), rich alkali (6.32% - 8.77% of K2O+Na2O, averagely 7.46%), high K2O/Na2O ratio (1.1 - 2.2), rich Al and scarce Ca, Fe and Mg, belonging to high-K calc-alkaline series. The trace elements show enrichment in Sr, Rb, Th and Ce and relative deficiency of Zr, Hf, Sm, Y and Yb. The rare earth elements distribution curves tend right. The light rare earth elements are concentrated with well fractionation and obvious Eu negative anomaly. The heavy rare earth elements are relatively deficient with poor fractionation. Combining with structure formation background, it is considered that the Hamaerwula granite-porphyry is granitoid pluton of late orogenic epoch.关键词
花岗斑岩/岩石地球化学/U-Pb定年/哈马尔乌拉/内蒙古Key words
granite-porphyry/ lithogeochemistry/ U-Pb dating/ Hamaerwula/ Inner Mongolia分类
天文与地球科学引用本文复制引用
徐学纯,李雪菲,赵庆英,程立人,王天武..内蒙古哈马尔乌拉花岗斑岩的锆石U-Pb定年及其岩石地球化学特征[J].地质与资源,2011,20(3):161-166,6.基金项目
内蒙古自治区区政府项目([2004]007)和国家深部探测关键仪器装备研制与实验项目资助 （[2004]007）
