scholarly journals Rates of change over Oceanic Anoxic Event 2: a high-resolution 3HeET timescale through the Bonarelli Level, Umbria–Marche, Italy

2021 ◽  
Author(s):  
James Lucas ◽  
Stuart Robinson ◽  
Hugh Jenkyns ◽  
Chris Ballentine
Keyword(s):  
High Resolution ◽  
Oceanic Anoxic Event ◽  
Rates Of Change ◽  
Oceanic Anoxic Event 2 ◽  
Anoxic Event

scholarly journals High-resolution bio- and chemostratigraphy of an expanded record of Oceanic Anoxic Event 2 (Late Cenomanian–Early Turonian) at Clot Chevalier, near Barrême, SE France (Vocontian Basin)

2019 ◽  
Vol 52 (1) ◽  
pp. 97-129 ◽  
Author(s):  
Andrew S. Gale ◽  
Hugh C. Jenkyns ◽  
Harilaos Tsikos ◽  
Yvonne van Breugel ◽  
Jaap S. Sinninghe Damsté ◽  
...  
Keyword(s):  
High Resolution ◽  
Oceanic Anoxic Event ◽  
Oceanic Anoxic Event 2 ◽  
Anoxic Event ◽  
Se France

scholarly journals CO2-induced climate forcing on the fire record during the initiation of Cretaceous oceanic anoxic event 2

2019 ◽  
Vol 132 (1-2) ◽  
pp. 321-333 ◽  
Author(s):  
Sarah J. Baker ◽  
Claire M. Belcher ◽  
Richard S. Barclay ◽  
Stephen P. Hesselbo ◽  
Jiří Laurin ◽  
...  
Keyword(s):  
High Resolution ◽  
Fire History ◽  
Climate Changes ◽  
Hydrological Cycle ◽  
Geological Time ◽  
Oceanic Anoxic Event ◽  
Organic Carbon Burial ◽  
Oceanic Anoxic Event 2 ◽  
Anoxic Event ◽  
Atmospheric Co2 Concentrations

Abstract Cretaceous oceanic anoxic event 2 (OAE2) is thought to have been contemporary with extensive volcanism and the release of large quantities of volcanic CO2 capable of triggering marine anoxia through a series of biogeochemical feedbacks. High-resolution reconstructions of atmospheric CO2 concentrations across the initiation of OAE2 suggest that there were also two distinct pulses of CO2 drawdown coeval with increased organic carbon burial. These fluctuations in CO2 likely led to significant climatic changes, including fluctuations in temperatures and the hydrological cycle. Paleofire proxy records suggest that wildfire was a common occurrence throughout the Cretaceous Period, likely fueled by the estimated high atmospheric O2 concentrations at this time. However, over geological time scales, the likelihood and behavior of fire are also controlled by other factors such as climate, implying that CO2-driven climate changes should also be observable in the fossil charcoal record. We tested this hypothesis and present a high-resolution study of fire history through the use of fossil charcoal abundances across the OAE2 onset, and we compared our records to the estimated CO2 fluctuations published from the same study sites. Our study illustrates that inferred wildfire activity appears to relate to changes in CO2 occurring across the onset of OAE2, where periods of CO2 drawdown may have enabled an increase in fire activity through suppression of the hydrological cycle. Our study provides further insight into the relationships between rapid changes in the carbon cycle, climate, and wildfire activity, illustrating that CO2 and climate changes related to inferred wildfire activity can be detected despite the estimated high Cretaceous atmospheric O2 concentrations.

High resolution osmium data record three distinct pulses of magmatic activity during cretaceous Oceanic Anoxic Event 2 (OAE-2)

2020 ◽  
Vol 285 ◽  
pp. 257-273 ◽  
Author(s):  
Daniel L. Sullivan ◽  
Alan D. Brandon ◽  
James Eldrett ◽  
Steven C. Bergman ◽  
Shawn Wright ◽  
...  
Keyword(s):  
High Resolution ◽  
Magmatic Activity ◽  
Oceanic Anoxic Event ◽  
Oceanic Anoxic Event 2 ◽  
Anoxic Event ◽  
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