地质与勘探2018，Vol.54Issue(2)：300-314,15.
南秦岭花红树坪花岗闪长岩年代学及地球化学特征
LA-ICP-MS Zircon Geochronology and Geochemistry of the Huahongshuping Granodiorite Pluton in South Qinling
摘要
Abstract
The Huahongshuping pluton,outcropped in south Qinling belt,Fengxian county,is composed principally of biotite granodiorite.LA-ICP-MS zircon U-Pb geochronological and petrogeochemical studies show that the zircon 206Pb/ 238U weighted average ages of the rocks are 214.3±2.7Ma(MSWD=2. 6),indicating the crystallized-age of the pluton in Late Triassic epoch. The SiO2= 61.45%~65.10%, TiO2=0.52%~0.63%, Al2O3=14.97%~15. 74%, MgO=2.33%~3.02%,Mg#=51.31~53.61,high in Sr(485×10-6~563×10-6),Sr/Y(28.2~30.4),and low in Y(17.0×10-6~19.1×10-6), Yb (1.46×10-6~1.83×10-6), weakly negative Eu anomalies, suggests that the Huahongshuping pluton belongs to high-Mg adakitic rocks. Combined with the regional geological setting of the Qinling orogenic belt,the Huahongshuping pluton was formed in the tectonic setting of post-collisional orogeny,derived from partially melted thicked lower crust delamination, mixed with mantle magma, and the polymetallic mineralization of Fengtai mineral cluster region likely has a genetic relationship with it.关键词
花岗闪长岩/年代学/岩石地球化学/花红树坪/南秦岭Key words
granodirite/LA-ICP-MS zircon U-Pb dating/geochemistry/Huahongshuping/south Qinling分类
天文与地球科学引用本文复制引用
张亚峰,杨涛,易鹏飞,姚征,何元方..南秦岭花红树坪花岗闪长岩年代学及地球化学特征[J].地质与勘探,2018,54(2):300-314,15.基金项目
陕西省地质调查财政专项项目《陕西省凤太矿田西部基础地质调查(编号:20150101)资助. （编号:20150101）
