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Abiogenic Hydrocarbon Production at Lost City Hydrothermal Field

2008/02/01 by G. Proskurowski, Marvin D. Lilley, Jeffery Seewald +5 · 20 citations
Environmental Science · Engineering · Chemistry · #Methane Hydrates and Related Phenomena #Hydrocarbon exploration and reservoir analysis #Atmospheric and Environmental Gas Dynamics #Abiogenic petroleum origin #Ultramafic rock #Hydrothermal circulation #Carbon fibers #Isotopes of carbon #Methane #Geochemistry #Hydrothermal vent #Seawater #Hydrocarbon #Chemistry #Environmental chemistry #Geology #Total organic carbon #Organic chemistry #Materials science #Paleontology #Oceanography

paper · doi:10.1126/science.1151194

openalex publication_date 2008/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Low-molecular-weight hydrocarbons in natural hydrothermal fluids have been attributed to abiogenic production by Fischer-Tropsch type (FTT) reactions, although clear evidence for such a process has been elusive. Here, we present concentration, and stable and radiocarbon isotope, data from hydrocarbons dissolved in hydrogen-rich fluids venting at the ultramafic-hosted Lost City Hydrothermal Field. A distinct "inverse" trend in the stable carbon and hydrogen isotopic composition of C1 to C4 hydrocarbons is compatible with FTT genesis. Radiocarbon evidence rules out seawater bicarbonate as the carbon source for FTT reactions, suggesting that a mantle-derived inorganic carbon source is leached from the host rocks. Our findings illustrate that the abiotic synthesis of hydrocarbons in nature may occur in the presence of ultramafic rocks, water, and moderate amounts of heat.

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