• 责任者：Yin Fuguang (Chengdu Institute of Geology and Mineral Resource ; Chengdu 610081 ; China) ; Su Zhiming
• 刊名：Journal of Stratigraphy
• 出版年：2011
• 卷期：35(1)
• 关键词：中元古代 ; Mesoproterozoic ; 四川 ; Sichuan Province ; 云南 ; Yunnan Province
• 页码：p.49-54
• 图表：4 illus., 1 table, 42 refs.
• 分类号：1200
• issnNo：ISSN0253-4959
• isbnNo：CN32-1187/P

The Proterozoic strata outcrop widely in Dongchuan and Central Yunnan but the outcrops are discontinuously distributed in these areas. Due to the lack of paleontological and age data, there have been confecting views on the stratigraphic sequence and correlation of these strata. The authors here report a SHRIMP zircon age of (1 503±17) Ma from a volcanic tuff in the Heishan Formation of the Dongchuan region, and a (1 047±15) Ma SHRIMP zircon age from the Heishantou Formation in central Yunnan Province. Thus, the two Formations are of different depostional ages and they cannot be correlated. The authors also confirm that the stratigraphic sequences in both regions are of “normal stratigraphic sequence”. Therefore, it is recommended that the Mesoproterozoic stratigraphic units be maintained separately in these two regions because they are of different ages.