Distortion of carbon isotope excursion in bulk soil organic matter during the Paleocene-Eocene thermal maximum

2016 ◽  
Vol 128 (9-10) ◽  
pp. 1352-1366 ◽  
Author(s):  
Allison A. Baczynski ◽  
Francesca A. McInerney ◽  
Scott L. Wing ◽  
Mary J. Kraus ◽  
Paul E. Morse ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carbon Isotope ◽  
Bulk Soil ◽  
Carbon Isotope Excursion ◽  
Thermal Maximum

Field evidence for coal combustion links the 252 My-old Siberian Traps with global carbon disruption

2021 ◽  
Author(s):  
Linda Elkins-Tanton ◽  
Steven Grasby ◽  
Benjamin Black ◽  
Roman Veselovskiy ◽  
Omid Ardakani ◽  
...  
Keyword(s):  
Organic Matter ◽  
Carbon Isotope ◽  
Flood Basalts ◽  
Siberian Traps ◽  
Field Evidence ◽  
Carbon Isotope Excursion ◽  
Show Evidence ◽  
Volcaniclastic Rocks ◽  
Atmospheric Changes ◽  
Global Carbon

<p>The Permo-Triassic Extinction was the most severe in Earth history. The Siberian Traps eruptions are strongly implicated in the global atmospheric changes that likely drove the extinction. A sharp negative carbon isotope excursion coincides within geochronological uncertainty with the oldest dated rocks from the Norilsk section of the Siberian flood basalts. The source of this light carbon has been debated for decades.</p><p>We focused on the voluminous volcaniclastic rocks of the Siberian Traps, relatively unstudied as potential carriers of carbon-bearing gases. Over six field seasons we collected rocks from across the Siberian platform and show the first direct evidence that the earliest eruptions particularly in the southern part of the province burned large volumes of a combination of vegetation and coal. Samples from the Maymecha-Kotuy region, from the Nizhnyaya Tunguska, Podkamennaya Tunguska, and Angara Rivers all show evidence of high-temperature organic matter carbonization and combustion.</p><p>Field evidence indicates a process in which ascending magmas entrain xenoliths of coal and carbonaceous sediments that are carbonized in the subsurface and also combusted either through reduction of magmas or when exposed to the atmosphere. We demonstrate that the volume and composition of organic matter interactions with magmas may explain the global carbon isotope signal, and have significantly driven the extinction.</p>

scholarly journals Onset of carbon isotope excursion at the Paleocene-Eocene thermal maximum took millennia, not 13 years

2014 ◽  
Vol 111 (12) ◽  
pp. E1062-E1063 ◽  
Author(s):  
R. E. Zeebe ◽  
G. R. Dickens ◽  
A. Ridgwell ◽  
A. Sluijs ◽  
E. Thomas
Keyword(s):  
Carbon Isotope ◽  
Carbon Isotope Excursion ◽  
Thermal Maximum
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