Zircon U-Pb Age for the Tuff before the Luoping Biota and Its Geological Implication
详细信息
- 责任者：Xie Tao (Chengdu Center ; China Geological Survey ; Chengdu 610081 ; China) ; Zhou Changyong
- 刊名：Geological Review
- 出版年：2013
- 卷期：59(1)
- 关键词：二叠纪 ; Permian ; 凝灰岩 ; tuff ; 铀—铅计时 ; U-Pb dating
- 页码：p.159-164
- 图表：illus., 1 table, 51 refs.
- 分类号：1200
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
The full recovery from the end-Permian extinction event had a duration of about 6 Ma delayed Early Triassic recovery was longer than could be accounted for merely by the magnitude of the extinction and was best explained by continuing environmental stress. Crucial to models for the extinction and subsequent recovery is a precise chronology. A volcanic-ash horizon was found under the Luoping biota (Anisian) layer. It is widely distributed in southern China and named the green-bean rock. Zircon LA-ICP-MS U-Pb age of 246.6±1.4Ma provides limit to the age of Luoping biota. It provides a precise point time for recovery and radiation, and provides a time frame for regional stratigraphic correlation.
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