地质通报2017，Vol.36Issue(11)：2082-2090,9.
吉林省大石头镇北部青茶馆-元宝山花岗斑岩锆石U-Pb年龄及地球化学特征
Zircon U-Pb ages and geochemical characteristics of the granite porphyry in Qingchaguan- Yuanbaoshan area, northern Dashitou Town, Jilin Province
摘要
Abstract
The granite porphyry in Qingchaguan-Yuanbaoshan area, northern Dashitou Town, Jilin Province, is characterized by high SiO2, rich aluminum, high rare earth elements (REE) and high large ion lithophile elements (LILE) .The REE patterns are char?acterized by enrichment of LREEs relative to HREEs and distinct negative Eu anomalies in chondrite-normalized REE patterns , with right oblique and"V"shaped feature.The zircons from the granite porphyry show oscillatory growth zonation of typical mag?matic origin and high Th/U ratios (0.47~1.07),indicating a magmatic origin for the zircons. The LA-ICP-MS dating of a zircon sample yielded U-Pb age of 116.8±1.5Ma (n=13,MSWD=1.13). These features suggest that the granite porphyry belongs to I-type granite of high potassium calc-alkaline and differentiation, being post-collisional granitoid, and its formation may be associated with the subduction of the ancient Pacific plate.关键词
花岗斑岩/LA-ICP-MS锆石U-Pb测年/I型花岗岩/后造山环境Key words
granite porphyry/LA-ICP-MS zircon U-Pb dating/I-type granite/post-collisional environment分类
天文与地球科学引用本文复制引用
高峰,魏俏巧,牟静涛,邱宏,于雷,马骏雨..吉林省大石头镇北部青茶馆-元宝山花岗斑岩锆石U-Pb年龄及地球化学特征[J].地质通报,2017,36(11):2082-2090,9.基金项目
中国地质调查局项目《吉林1:5万东沟屯(K52E004011)、黑水(K52E004012)幅区域地质矿产调查》(编号:12120114029001) （K52E004011）
