CALIBRATION OF THE EARLY CRETACEOUS TIME SCALE: A COMBINED CHEMOSTRATIGRAPHIC AND CYCLOSTRATIGRAPHIC APPROACH TO THE BARREMIAN–APTIAN INTERVAL, CAMPANIA APENNINES AND SOUTHERN ALPS (ITALY)

2004 ◽  
pp. 123-133 ◽  
Author(s):  
LUKAS WISSLER ◽  
HELMUT WEISSERT ◽  
FRANCESCO P. BUONOCUNTO ◽  
VITTORIA FERRERI ◽  
BRUNO D’ARGENIO
Keyword(s):  
Early Cretaceous ◽  
Time Scale ◽  
Southern Alps

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

2015 ◽  
Vol 152 (3) ◽  
pp. 557-564 ◽  
Author(s):  
BEATRIZ AGUIRRE-URRETA ◽  
MARINA LESCANO ◽  
MARK D. SCHMITZ ◽  
MAISA TUNIK ◽  
ANDREA CONCHEYRO ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Time Scale ◽  
Lower Cretaceous ◽  
Geological Time ◽  
Geological Time Scale ◽  
Standard Sequence ◽  
Lower Horizon ◽  
The Andes ◽  
Upper Hauterivian ◽  
The Mediterranean

AbstractTwo tuffs in the Lower Cretaceous Agrio Formation, Neuquén 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 atc. 129.5 Ma and the latter atc. 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.

Assessing orbital vs. volcanic control on carbon cycle during the Early Cretaceous

2021 ◽  
Author(s):  
Mathieu Martinez ◽  
Beatriz Aguirre-Urreta ◽  
Marina Lescano ◽  
Guillaume Dera ◽  
Julieta Omarini ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Early Cretaceous ◽  
Time Scale ◽  
Environmental Changes ◽  
Large Igneous Province ◽  
Carbonate Production ◽  
Geologic Time ◽  
Lower Amplitude ◽  
Igneous Province ◽  
Geologic Time Scale

<p>The interval from the Valanginian to the Barremian stages (137–121 Ma; Early Cretaceous) is punctuated by several episodes of environmental changes, accompanied by shifts in weathering intensity on the continents and changes in the Tethyan neritic carbonate production. We synthetize here the astrochronology of two recent studies performed in the Neuquén basin, Vocontian Basin and Subbetic Domain (Aguirre-Urreta et al., 2019; Martinez et al., 2020), anchored to CA-ID-TIMS U-Pb ages, which conclusions have been included in the Geologic Time Scale 2020 (Gale et al, in press). We applied this time scale to a compilation of carbon-isotope ratio from belemnites and proxies of detrital supply in the Tethyan area (Vocontian Basin and Subbetic Domain). From this compilation, we show that the episodes of environmental changes are paced by a 2.4-Myr cycle and, with a lower amplitude, a 1.2-Myr cycle. In addition, the new time scale shows the synchronicity between the Weissert Event and the Parana-Etendeka Large Igneous Province. In the series of carbon-isotope ratios measured on belemnite rostra, the amplitude of the 2.4-Myr cycle is twice higher during the Valanginian than in the Late Barremian and three times higher than in the Hauterivian and Early Barremian, suggesting that the activity of the Parana-Etendeka Large Igneous Province amplified the initial orbital forcing to trigger the environmental changes observed during the Mid-Valanginian.</p><p>Reference:</p><p>Aguirre-Urreta, B., Martinez, M., Schmitz, M., Lescano, M., Omarini, J., Tunik, M., Kuhnert, H., Concheyro, A., Rawson, P.F., Ramos, V.A., Reboulet, S., Noclin, N., Frederichs, T., Nickl, A.-L., Pälike, H., 2019. Interhemispheric radio-astrochronological calibration of the time scales from the Andean and the Tethyan areas in the Valanginian–Hauterivian (Early Cretaceous). Gondwana Research 70, 104-132. https://doi.org/10.1016/j.gr.2019.01.006.</p><p>Gale, A.S., Mutterlose, J., Batenburg, S., in press. Chapter 27: The Cretaceous Period, in: Gradstein, F.M., Ogg, J.G., Schmitz, M.D., Ogg, G.M. (Eds.) Geologic Time Scale 2020. Elsevier BV, Amsterdam, The Netherlands, pp. 1023–1086.</p><p>Martinez, M., Aguado, R., Company, M., Sandoval, J., O’Dogherty, L., 2020. Integrated astrochronology of the Barremian Stage (Early Cretaceous) and its biostratigraphic subdivisions. Global and Planetary Change 195, 103368. https://doi.org/10.1016/j.gloplacha.2020.103368.</p>

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