Immiscible hydrocarbon fluids in the deep carbon cycle.

Abstract:

:The cycling of carbon between Earth's surface and interior governs the long-term habitability of the planet. But how carbon migrates in the deep Earth is not well understood. In particular, the potential role of hydrocarbon fluids in the deep carbon cycle has long been controversial. Here we show that immiscible isobutane forms in situ from partial transformation of aqueous sodium acetate at 300 °C and 2.4-3.5 GPa and that over a broader range of pressures and temperatures theoretical predictions indicate that high pressure strongly opposes decomposition of isobutane, which may possibly coexist in equilibrium with silicate mineral assemblages. These results complement recent experimental evidence for immiscible methane-rich fluids at 600-700 °C and 1.5-2.5 GPa and the discovery of methane-rich fluid inclusions in metasomatized ophicarbonates at peak metamorphic conditions. Consequently, a variety of immiscible hydrocarbon fluids might facilitate carbon transfer in the deep carbon cycle.

journal_name

Nat Commun

journal_title

Nature communications

authors

Huang F,Daniel I,Cardon H,Montagnac G,Sverjensky DA

doi

10.1038/ncomms15798

subject

Has Abstract

pub_date

2017-06-12 00:00:00

pages

15798

issn

2041-1723

pii

ncomms15798

journal_volume

8

pub_type

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