What question did this study set out to answer?

To synthesize the geochemical mechanisms, environmental drivers, and redox transitions that governed major oceanic anoxic events during the Mesozoic Era.

March 1, 2010Geochemistry Geophysics Geosystems

Geochemistry of oceanic anoxic events

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HJHugh C. JenkynsUniversity of Oxford

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Implication

Geochemical review reveals widespread deoxygenation and euxinia in Mesozoic marine basins, indicating profound climate-driven carbon cycle disruptions.

Key Points

To synthesize the geochemical mechanisms, environmental drivers, and redox transitions that governed major oceanic anoxic events during the Mesozoic Era.
Compiled stratigraphic and geochemical data across four major Mesozoic events: the early Toarcian, early Aptian, early Albian, and Cenomanian–Turonian.
Evaluated seawater isotope systematics (strontium, osmium, nitrogen, sulfur, iron, molybdenum, and uranium) and elemental enrichment patterns in marine sediments.
Rapid carbon dioxide influx and climate warming accelerated hydrological cycling and continental weathering, elevating marine nutrient delivery and primary organic productivity.
Enhanced organic flux and water-column density stratification depleted dissolved oxygen, driving basins into sulfidic euxinia, denitrification, and widespread pyrite precipitation.
Enhanced organic carbon burial in black shales and continental silicate weathering gradually sequestered excess atmospheric carbon dioxide over tens to hundreds of thousands of years.

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Hugh C. Jenkyns (2010) studied this question.

synapsesocial.com/papers/69d7e52711d83f35e5ae30f4 https://doi.org/10.1029/2009gc002788

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Implication

Geochemical review reveals widespread deoxygenation and euxinia in Mesozoic marine basins, indicating profound climate-driven carbon cycle disruptions.

Geochemistry of oceanic anoxic events

Discussion

Member takes

Implication

Key Points

Cite This Study

Geochemistry of oceanic anoxic events

Discussion

Member takes

Implication

Key Points

Cite This Study

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