Survival of graphitized petrogenic organic carbon through multiple erosional cycles

Graphite forms the endpoint for organic carbon metamorphism; it is extremely resilient to physical, biological and chemical degradation. Carbonaceous materials (CM) contained within sediments, collected across Taiwan and from the Gaoping submarine canyon, were analyzed using Raman spectroscopy to de...

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Veröffentlicht in:Earth and planetary science letters 2020-02, Vol.531, p.115992, Article 115992
Hauptverfasser: Sparkes, Robert B., Hovius, Niels, Galy, Albert, Liu, James T.
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creator Sparkes, Robert B.
Hovius, Niels
Galy, Albert
Liu, James T.
description Graphite forms the endpoint for organic carbon metamorphism; it is extremely resilient to physical, biological and chemical degradation. Carbonaceous materials (CM) contained within sediments, collected across Taiwan and from the Gaoping submarine canyon, were analyzed using Raman spectroscopy to determine the crystallinity. This allowed the erosional and orogenic movements of petrogenic organic carbon (OCpetro) during the Taiwanese orogeny to be deduced. After automatically fitting and classifying spectra, the distribution of four groups of CM within the sediments provides evidence that many forms of OCpetro have survived at least one previous cycle of erosion, transport and burial before forming rocks in the Western Foothills of the island. There is extensive detrital graphite present in rocks that have not experienced high-grade metamorphism, and graphite flakes are also found in recently deposited marine sediments off Taiwan. The tectonic and geological history of the island shows that these graphite flakes must have survived at least three episodes of recycling. Therefore, transformation to graphite during burial and orogeny is a mechanism for stabilizing organic carbon over geological time, removing biospheric carbon from the active carbon cycle and protecting it from oxidation during future erosion events. •Petrogenic organic carbon was tracked through erosion and burial events.•Highly graphitized material must have survived at least three erosional cycles.•Graphitization leads to long-term carbon stabilization, even in orogenic settings.
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subjects Earth Sciences
erosion
Geochemistry
graphite
organic carbon
orogeny
Raman spectroscopy
recycling
Sciences of the Universe
title Survival of graphitized petrogenic organic carbon through multiple erosional cycles
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