寿昌—临浦火山岩带赋矿流纹岩特征及归属雏议

本文介绍的火山岩带，有层状流纹岩及穹丘状、岩颈状等非层状流纹岩，分别属溢流相、侵出相及火山管道相，三种流纹岩均受火山岩带核中断裂及晚期火山构造控制，复盖或穿发寿昌组一段地层，又被寿昌组一段之后的次火山岩及隐爆岩所穿切，局部被横山组不整合复盖。该类流纺岩同位素年龄值较小，多数在１３０Ｍａ左右，处于晚侏罗世与早白垩世过渡期。根据其层序、穿切关系及同位素年龄等，认为三种流纹岩均属火山岩带晚期不同岩相的产

The Characteristics and Chronostratigraphy of Rhyolite in Which Uranium Ore Occurs in Shouchang Linpu Volcanic Rock Zone

There are three kinds of rhyolites in Shouchang Linpu Volcanic Rock Zone:Stratiform rhyolite, dome like rhyolite and neck like rhyolite, the last two are unstratified rhyolite. They separately belong to the flooding facies, intrusion out faceis and volcanic neck faceis. Three kinds of rhyolites are controlled by the core faults of the volcanic rock zone and the late volcanic structure. They cover and break a stage stratum of Shouchang formation, then, are broken by the subvolcanic rock and the cryptoexplosion rock which occur after first stage stratum of Shouchang formation ,and locally covered by Henshan formation in the way of unconformability. The isotope ages of the most of rhyolites is about 130 Ma, when is the transition period from late Jurassic epoch to early cretaceous epoch. According to strata sequence, breaking relation and isotope age, it is considered that three kinds of rhyolite are the products of the different rock facies of late formation period of volcanic rock zone, and probably the second stage horizon and geological body of Shouchang formation.