地质科学2012，Vol.47Issue(3)：899-907,9.
甘肃西秦岭舟曲憨班花岗岩体的单颗粒锆石U-Pb年龄及地质意义
Single-grain zircon U-Pb ages and geological significance of the Hanban granite from Zhouqu(Gansu) in the west Qinling orogenic belt
摘要
Abstract
Petrological and geochemical characteristics as well as formation ages of the Hanban granitic pluton has been investigated during the regional geological survey (scale 1:250 000) in Wudu,west Qinling Mountains. High-precision single-grain zircon U-Pb dating results yielded weighted average ages of 205 ±1 Ma and 212 ±1.4 Ma for fine-to middle-grained granodiorite and porphyritic adamellite in the Hanban pluton, respectively, indicating that the pluton was formed in the late Indosinian. The Hanban granitic rocks are high-K calc-alkaline in major elements and are plotted in the Held of volcanic arc and syn-collisional granite in the Rb-Yb+ Nb and Nb-Y plots. It is proposed that the Hanban pluton was formed by partial melting of thickened crust in the late stage of continent-continent collision.关键词
西秦岭/憨班花岗岩/单颗粒锆石U-Pb年龄/印支期Key words
West Qinling/ Hanban granitic pluton/ Single-grain zircon U-Pb dating/ Indosinian分类
天文与地球科学引用本文复制引用
刘明强..甘肃西秦岭舟曲憨班花岗岩体的单颗粒锆石U-Pb年龄及地质意义[J].地质科学,2012,47(3):899-907,9.基金项目
甘肃省国土资源厅1∶25万武都幅区调及地壳稳定性评价项目资助. （）
