期刊
GEOLOGICAL MAGAZINE
卷 152, 期 3, 页码 557-564出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S001675681400082X
关键词
Neuquen Basin; Hauterivian; biostratigraphy; ammonoids; calcareous nannofossils; U-Pb CA-ID-TIMS; Argentina
资金
- CONICET [PIP 509]
- ANPCYT [PICT 0464/10]
- UBACYT [09523, 09678]
Two tuffs in the Lower Cretaceous Agrio Formation, Neuquen Basin, provided U-Pb zircon radioisotopic ages of 129.09 +/- 0.16 Ma and 127.42 +/- 0.15 Ma. Both horizons are well constrained biostratigraphically by ammonites and nannofossils and can be correlated with the 'standard' sequence of the Mediterranean Province. The lower horizon is very close to the base of the Upper Hauterivian and the upper horizon to the Hauterivian/Barremian boundary, indicating that the former lies at c. 129.5 Ma and the latter at c. 127 Ma. These new radioisotopic ages fill a gap of over 8 million years in the numerical calibration of the current global Early Cretaceous geological time scale.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据