吉林省通化市东南部七道沟—老岭一带中生代地层及岩浆活动特征

THE MESOZOIC STRATA OF THE QIDAOGOU-LAOLING AREA, SOUTHEASTERN TONGHUA,JILIN PROVINCE AND THEIR MAGMATIC ACTIVITY CHARACTERISTICS

本文根据近几年在该区区调成果，阐述了本区火山岩系由四个火山旋回组成；秋皮沟一带分布一套以中酸性火山碎屑岩为主，夹少量中性熔岩及火山间歇期正常沉积的秋皮沟火山碎屑岩；南岔—复兴一带存在早白垩世三棵榆树期火山活动。区内原幸福山岩体、头道沟岩体、老岭村岩体均为复式岩体，反映为幸福山序列和头道沟序列岩浆组合特征。

There are Mesozoic volcanic rocks with a large area and intrusive rocks with the same facies in the Qidaogou-Laoling area,southern Tonghua ,Jilin Province.In this paper,on the basis of the results of regional geological surveying in recent years ,the system of volcanic rocks formed by 4 volcanic cycle components is expounded.The intermediate-acid pyro-clastic rock is dominant with a few of intermediate lava and common sedimentary pyroclastic rocks formed in the volcanic intermittent activities in the Qidaogou area.The volcanic activities existed in the Nancha-Fuxing area in the early Cretaceous Sankeyushu time .In the study area,the former Xingfushan,Toudaogou and Laolingcun orebodies are all composite and show magmatic component characteristics of the Xingfushan and Toudaogou successions.