【摘要】 皖南泾县地区花岗闪长岩为准铝—弱过铝质高钾钙碱性I型花岗岩,轻稀土富集,重稀土亏损,具弱的Eu负异常,略微富集大离子亲石元素Rb、U、Ba,亏损高场强元素Nb、P、Ti,具有明显的壳源特征,岩浆源区可能存在斜长石、石榴石残留,形成于由挤压向拉张环境过渡的地球动力学背景下。更多还原

【Abstract】 Granodiorite in the Jingxian area,southern Anhui is quasi-aluminous to weakly peraluminous high-potassium calc-alkaline type-I granite,which is rich in light REEs,depleted in HREEs,with weak Eu negative anomaly,slightly enriched in large ion lithophile elements of Rb, U and Ba, deficient in high field strength elements of Nb, P and Ti, with obvious characteristics of crustal source. There may be residual plagioclase and garnet in the source area of magma, which was formed in a geodynamic setting of transition from compression to extension.更多还原