Abstract:
:Over millions of years, the oxidation of organic carbon contained within sedimentary rocks is one of the main sources of carbon dioxide to the atmosphere, yet the controls on this emission remain poorly constrained. We use rhenium to track the oxidation of rock-bound organic carbon in the mountain watersheds of New Zealand, where high rates of physical erosion expose rocks to chemical weathering. Oxidative weathering fluxes are two to three times higher in watersheds dominated by valley glaciers and exposed to frost shattering processes, compared to those with less glacial cover; a feature that we also observe in mountain watersheds globally. Consequently, we show that mountain glaciation can result in an atmospheric carbon dioxide source during weathering and erosion, as fresh minerals are exposed for weathering in an environment with high oxygen availability. This provides a counter mechanism against global cooling over geological time scales.
journal_name
Sci Advjournal_title
Science advancesauthors
Horan K,Hilton RG,Selby D,Ottley CJ,Gröcke DR,Hicks M,Burton KWdoi
10.1126/sciadv.1701107subject
Has Abstractpub_date
2017-10-04 00:00:00pages
e1701107issue
10issn
2375-2548pii
1701107journal_volume
3pub_type
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