Mountain glaciation drives rapid oxidation of rock-bound organic carbon.

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 Adv

journal_title

Science advances

authors

Horan K,Hilton RG,Selby D,Ottley CJ,Gröcke DR,Hicks M,Burton KW

doi

10.1126/sciadv.1701107

subject

Has Abstract

pub_date

2017-10-04 00:00:00

pages

e1701107

issue

10

issn

2375-2548

pii

1701107

journal_volume

3

pub_type

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