延吉盆地龙井组上部发现层状火山岩——德新组的建立  

The discovery of layered volcanic rocks in the upper part of Longjing Formation in Yanji Basin:The establishment of Dexin Formation

作　　者：翟玉春[1] 郭道鹏 ZHAI Yu-chun;GUO Dao-peng(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130021,Jilin,China)

机构地区：[1]吉林省区域地质矿产调查所,吉林长春130021

出　　处：《吉林地质》2021年第1期1-4,共4页Jilin Geology

摘　　要：延吉盆地老头沟、三峰洞、帽儿山等地发育有多个呈孤峰状产出的安山岩地质体,长期以来被作为次火山岩体描述。作者在朝阳川镇德新村东发现其不整合覆盖于龙井组之上,确定其为一套喷出相火山岩,新建德新组,根据龙井组及区域上珲春组时代限定,推断其时代为晚白垩世。In the Laotougou,Sanfengdong,and Mao'ershan areas of the Yanji Basin,there are many andesite geological bodies developed in the form of isolated peaks,which have long been described as subvolcanic bodies.The author discovered that these geological bodies unconformably cover the Longjing Formation in the east of Dexin Village,Chaoyangchuan Town,and determined that it was a set of volcanic rocks of explosive facies,new-built Dexin Formation.According to the age limit of Longjing Formation and Hunchun Formation in the region.It is inferred that the age is Late Cretaceous.

关 键 词：火山岩 龙井组之上 德新组 延吉盆地 

分 类 号：P588.14[天文地球—岩石学]