ZE: 12pt; mso-font-kerning: 18.0pt; mso-bidi-font-family: 宋体" lang=EN-US>Zircon U-Pb Dating for the Boundary of Olenekian-Anisian at Wangmo, Guizhou Province

• 责任者：Zheng Liandi (Department of Earth Sciences ; Nanjing University ; Nanjing 210093 ; China) ; Yao Jianxin
• 刊名：Acta Geologica Sinica
• 出版年：2010
• 卷期：84(8)
• 关键词：安尼阶 ; Anisian ; SHRIMP定年 ; SHRIMP dating ; 贵州 ; Guizhou Province
• 页码：p.1112-1117
• 图表：4 illus., 1 table, 32 refs.
• 分类号：1200
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

ZE: 14pt" lang=EN-US> New zircon U-Pb age is obtained for late Early and Middle Triassic tuff layer from the Ganheqiao section, Wangmo County, Guizhou Province. The appearance of conodont Chiosella timorensis was discovered just 0.5 m below the tuff, which is used to define the Olenekian-Anisian boundary of the Lower/Middle Triassic. Twenty zircons defined a weighted mean ²⁰⁶Pb/²³⁸U age of (247.6± 1.4) Ma (2σ). The result defines a new dating for the regional stratigraphic correlation, and also provides a reliable dating for the duration of biological recovery in the Early Triassic after the extinction of Permo-Triassic.