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- W2011330408 abstract "In this paper we approach the problem of the origin of organic‐carbon‐rich sediments by using an integrated isotopic and organic geochemical study of the annual productivity/eutrophication cycle in the water column of Lake Greifen (Switzerland) and the historical expression of such cycles as found in the sediments. The Lake Greifen water column and sediment studies reveal that Δδ 13 C carbonate‐organic matter is correlated with the hydrogen indices (HI) of kerogens, explicable in terms of changing productivity and preservation of the organic matter, and the CO 2 budget of the water body. The lake model implies that, if high productivity in CO 2 limited surface waters (high nutrient/CO 2 ratio) was controlling the preservation of organic matter, a correlation between decreasing Δδ 13 C carbonate ‐organic matter and increasing HI values may be observed. In contrast, if low to moderate productivity in CO 2 unlimited surface waters (low nutrient/CO 2 ratio) where bottom water anoxia promotes the preservation of organic matter, a correlation between increasing Δδ 13 C carbonate‐organic matter and increasing HI values may be observed. Application of this model to two well known Jurassic sequences, gave a correlation of increasing HI values with decreasing Δδ 13 C carbonate‐organic matter for the Kimmeridge Clay Formation (United Kingdom), and increasing HI values with increasing Δδ 13 C carbonate organic matter for the early Toarcian shales (France). This suggests that the controlling factor of the former deposit was high primary bioproductivity and of the latter deposit anoxic bottom water conditions." @default.
- W2011330408 created "2016-06-24" @default.
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- W2011330408 date "1993-03-01" @default.
- W2011330408 modified "2023-10-18" @default.
- W2011330408 title "Application of an eutrophic lake model to the origin of ancient organic-carbon-rich sediments" @default.
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- W2011330408 doi "https://doi.org/10.1029/92gb02831" @default.
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