Filling the gap: new precise Early Cretaceous radioisotopic ages from the Andes

被引：55

作者：

Aguirre-Urreta, Beatriz ^{[1
]}

Lescano, Marina ^{[1
]}

Schmitz, Mark D. ^{[2
]}

Tunik, Maisa ^{[3
]}

Concheyro, Andrea ^{[1
]}

Rawson, Peter F. ^{[4
,5
]}

Ramos, Victor A. ^{[1
]}

机构：

[1] Univ Buenos Aires, CONICET, Inst Estudios Andinos Don Pablo Groeber, RA-1428 Buenos Aires, DF, Argentina

[2] Boise State Univ, Dept Geosci, Boise, ID 83725 USA

[3] Univ Rio Negro, Rio Negro, Argentina

[4] Univ Hull Scarborough Campus, Ctr Environm & Marine Sci, Scarborough YO11 3AZ, N Yorkshire, England

[5] UCL, Dept Earth Sci, London WC1E 6BT, England

来源：

GEOLOGICAL MAGAZINE | 2015年 / 152卷 / 03期

关键词：

Neuquen Basin; Hauterivian; biostratigraphy; ammonoids; calcareous nannofossils; U-Pb CA-ID-TIMS; Argentina; AMMONITE WORKING GROUP; NEUQUEN BASIN; BOUNDARY; BIOSTRATIGRAPHY; STAGE; STRATIGRAPHY; RECORD;

D O I：

10.1017/S001675681400082X

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页码：557 / 564

页数：8

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