PROBLEMS IN STRATIGRAPHIC SEQUENCE AND CORRELATION OF KUNYANG GROUP

The Xiaojie geosyncline of Yimen and Lubiao Formation in its core are negated by the regional geological surveying results of 1∶50 000 Lufeng, Duanqicun and Wazhijie sheets completed in recent years. In the Duanqicun sheet, it is pointed out definitely that the base fine conglomerate of Liubatang Formation is weakly unconformable over the Heishantou Member. And the original coose Fe ore bed in base Fe-bearing conglomerate of this Formation has been redivided into the Chengjiang Formation, which is unconformable over the Liubatang Formation. In Wazhijie sheet, a new knowledge of Huangcaoling Formation in Shiping has been got, ie, the pyrite-bearing(Maanshan) and Pb-Zn-Cu metallized(Huangshachang)carbonate rock bed in its lower part is a new set up separately as Chejiacheng Formation and Reshuitang Formation, which are the lowest horizons of the outcropped Lower Sub-Group in Central Yunnan. According to these results, it is in doubt whether the Chahe formation, Qingshuigou Formation over the Meidang Formation set up in Xiaojie section could be correlated and extensive towards Dongchuan, Luquan, Anning, Jinning and Shiping, etc.