Geochronology research on the volcanic rock profile of the gazha cun group in the wuyii basin indicates that the 40ar - 39ar age of the post - collision volcanic rock is 12 - 14ma . and the granite that cut the volcanic rock is 10 . 84ma 羊应乡火山岩样品中透长石及黑云母的~ ( 40 ) ar - ~ ( 39 ) ar定年结果确认该区存在后碰撞火山岩,其喷发年龄在11ma左右。