Reduced Marine Molybdenum Inventory Related to Enhanced Organic Carbon Burial and an Expansion of Reducing Environments in the Toarcian (Early Jurassic) Oceans

نویسندگان

چکیده

Many metals present in trace concentrations the oceans are sensitive to reduction and oxidation reactions (termed redox-sensitive or RSTMs) can therefore be affected during intervals of expanded oceanic anoxia euxinia (anoxic sulfidic waters). These RSTMs important micronutrients; their availability plays a significant role controlling metabolic pathways ecosystem structure. Understanding links restructuring potential collapse is since past deoxygenation events associated with biological turnover. The Early Jurassic Toarcian Oceanic Anoxic Event (T-OAE) was one such event. We focus on RSTM molybdenum (Mo), nitrogen cycle, from basin transect where local redox conditions permit tracking marine reservoir Mo. Mo enrichments start decline Pliensbachian, continue early Toarcian, drop precipitously T-OAE interval, remain low afterward before protracted increase toward initial values seen Pliensbachian. From compilation available data, we estimate that ∼41 Gt buried using range possible flux estimates. Given known correlations total organic carbon, estimated burial carbon interval ∼244,000 Gt. This requires minimum 3.25% ocean floor covered by euxinic waters. Finally, suggest traditionally classified as OAEs greatest extent euxinia.

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ژورنال

عنوان ژورنال: AGU advances

سال: 2022

ISSN: ['2576-604X']

DOI: https://doi.org/10.1029/2022av000671