吉南地区马达岭组的时代重新厘定及其意义  

REDETERMINATION ON THE AGE OF THE MADALING FORMATION,IN THE SOUTHERN PART OF JILIN PROVINCE AND ITS GEOLOGIC SIGNIFICANCE

作　　者：陈跃军 周晓东 

机构地区：[1]吉林地勘局区调所

出　　处：《吉林地质》1996年第2期27-30,共4页Jilin Geology

摘　　要：吉林地区的马达岭组为一套河流相紫色、紫红色砂砾岩，前人曾先后将其置于中侏罗世、晚侏罗世、新元古代、古元古代。但由于缺少直接或间接的地质证据及同位素年龄资料，故其时代问题一直悬而未决。１９９１～１９９３年笔者等在红土崖幅（１／５万）进行区调工作，发现了青白口纪钓鱼台组不整合覆于马达岭组之上，根据层序学的理论分析，马达岭组应属新元古代海侵早期深切河谷沉积。故将其时代置于青白口纪早青白口世。The Madaling formation, in the southern part of Jinn province, is a set of revenue purple,purplishred sandy conglomerates.In the past,it was are short of the geologic evidences and isotopic age data, the geochronologic determination unresolved.In 1991-1993,we conducted regional geological investigation for the Hongtuya sheet(1:50 000),and found that Diaoyutai Formation of Qingbaikou period lay unconformably on the Madaling formation.According to the sequence stratigraphy theory,the Madaling Formation should belong to neoproterozoic,deep river-cut valley deposit.So,the geologic age should be the Qingbaibou period,early Xingbaikou epoch.

关 键 词：马达岭组 青白口纪 地层时代 吉南地区 

分 类 号：P534[天文地球—古生物学与地层学]