云南马关新近系小龙潭组震积岩的发现及意义

马关地区新近系小龙潭组分布于北东向新保寨断层形成的断陷盆地内,属于湖泊相碎屑沉积。笔者近期在该组中下部首次发现震积岩,其垂向序列特征较为清楚,为研究该地区古地震活动规律提供了新资料,填补了云南新近纪断陷盆地地震灾变事件记录的空白,具有重要的地质意义。

Discovery and significance of the seismites in the Neogene Xiaolongtan Formation in Maguan, Yunnan

The Neogene Xiaolongtan Formation in Maguan,Yunnan is interpreted to be the lacustrine deposits.In the middle-lower part of the Formation,the seismites are recently identified by the authors for the first time.These seismites display the features of excellent outcrops,various rock types,continuous sequences and abundant fossils,and thus may be selected as an ideal locus for the examination of the seismite sequences in fault basins.The discovery of the seismites has provided not only seismic event records in Neogene fault basins but also new data for the study of palaeoseismic activity in the study area.