1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. No. 240 Institute of Nuclear Industry，Shenyang 110032，China

Enhedaling volcanic edifice from Shanghulin Basin in northern Great Xing'an Range is mainly com- posed of acid lavas，pyroclastic rocks，sub- volcanic rocks and volcanic sedimentary rocks of Baiyingaolao Forma- tion． The measured section shows that the volcanic edifice is made up of extrusive facies，overflow facies，explosive facies，sub- volcanic facies and volcanic sedimentary facies． Different lithology and facies distribute around the cra- ter approximate symmetrically with outward tilt of rock strata，which belong to dome shaped volcano of the central type eruption． Zircon U- - Pb dating results of rhyolite with overflow facies and syenite porphyry with sub- volcanic fa- cies are (115. 3 ±2. 3) Ma and (114. 3 ±1. 6) Ma，respectively，indicating that Enhedaling volcanic edifice was formed in the later Early Cretaceous． The volcanic edifice is a simple volcanic eruption cycle- a volcanic eruption period，the possible process of volcanic activity can be divided into four stages， the first stage is the early magma o- verflow，formed overflow rhyolite with a small amount of rhyolitic breccia tuff; the second stage is the late volcanic eruption，produced a large amount of explosive facies pyroclastic rocks; the third stage is magmatic intrusion， formed extrusive facies pitchstone and sub- volcanic facies syenite porphyry，etc; the fourth stage is the intermittent period of the volcanic activity，produced volcanic sedimentary rocks of volcanic sedimentary facies．