Luoyu and Ruyang Group at the South Margin of the North China Craton （NCC） Should Belong in the Mesoproterozoic Changchengian System： Direct Constraints from the LA-MC-ICPMS U-Pb Age of the Tuffite in the Luoyukou Formation, Ruzhou, Henan, China
详细信息
- 责任者：Su Wenbo (School of Earth-Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Li Huaikun
- 刊名：Geological Survey and Research
- 出版年：2012
- 卷期：35(2)
- 关键词：长城纪 ; Changcheng Period ; 地层划分 ; stratigraphic classification ; 河南 ; Henan Province
- 页码：p.96-108
- 图表：6 illus., 3 tables, 89 refs.
- 分类号：1200
- issnNo：ISSN1672-4135
- isbnNo：CN12-1353/P
摘要
By
means of the LA-MC-ICPMS zircon U-Pb dating, the high-precise dates of the volcanic
eruption, (1 611 ±8) Ma, of an interbedded tuffite layer in the middle
part of the Luoyukou Formation at the Yangpo Section, Ruzhou City, Henan Province, has been obtained. With this dates, the depositional age of the Luoyukou Formation
can be calibrated accurately as the first time, which indicates that the top age of this
formation should be most likely about 1 600 Ma. The new dating achievement of
the Luoyukou Formation will result in a major revision in chronostratigraphy
that both of the two groups should be lowered down to the older Mesoproterozoic
Changchengian System.