AI Article Synopsis
- - The hydrothermal products from the Clam hydrothermal field in the Okinawa Trough were analyzed for hydrocarbon content using gas chromatography-mass spectrometry, revealing a unique distribution pattern of n-alkanes. - The study found that the total concentration of n-alkanes was significantly higher in hydrothermal sediment compared to other samples, with specific carbon isotopic values indicating varying sources of these hydrocarbons. - The findings suggest that the n-alkanes are primarily produced by the metabolic activity of submarine microorganisms, although there may also be an abiogenic (non-biological) contribution to their presence in the hydrothermal products.
Article Abstract
The hydrothermal products of the Clam hydrothermal field from the Okinawa Trough were analyzed by gas chromatography-mass spectrometry to determine abundances of hydrocarbons. The n-alkanes in the hydrothermal products conformed to a bimodal distribution and exhibited an odd-to-even predominance of high molecular weight and an even-to-odd predominance of low molecular weight n-alkanes with maxima at C and C. The total concentration of n-alkanes in hydrothermal sediment was much higher than that in hydrothermal sulfide and altered rock. The carbon isotopic value of individual n-alkanes in hydrothermal sediment was slightly higher than that in pelagic sediment. The concentrations and individual carbon isotopic compositions of n-alkanes suggest that the n-alkanes in hydrothermal products may be mainly the result of the metabolic activity of submarine microorganisms. Additionally, the present results suggest that the abiogenic contribution to source of hydrocarbons in hydrothermal products of the Clam hydrothermal field from the Okinawa Trough should not be ignored.
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| http://dx.doi.org/10.1016/j.marpolbul.2021.112277 | DOI Listing |
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