Reduced Gases and Bacteria in Hydrothermal Fluids: The Galapagos Spreading Center and 21°N East Pacific Rise View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1983

AUTHORS

Marvin D. Lilley , John A. Baross , Louis I. Gordon

ABSTRACT

Hydrothermal fluids at the Galapagos Spreading Center (GSC) and at 21°N on the East Pacific Rise were enriched in methane, hydrogen and carbon monoxide by orders of magnitude over ambient bottom water. Nitrous oxide showed both enrichment and depletion in warm vent waters. Each GSC vent field exhibited unique dissolved gas to silica ratios indicating that complex source — sink mechanisms operated within a small geographic region. The CH4/3 He ratio at 21°N was 6.1 × 106 whereas at the GSC, a range of 12.4 to 42 × 106 was seen. At 21°N the H2/3 He ratio was on the order of 100 times that at the GSC. Microbial data showed as many as 109 organisms ml−1 in GSC samples and 105 ml−1 in the hot 21°N waters. These microbial communities are complex and include organisms known to produce and consume the gases discussed here. We conclude that microbial activity in the warm GSC vents is a significant contributing factor in determining the final gas concentrations in the vent waters. More... »

PAGES

411-449

Book

TITLE

Hydrothermal Processes at Seafloor Spreading Centers

ISBN

978-1-4899-0404-1
978-1-4899-0402-7

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4899-0402-7_18

DOI

http://dx.doi.org/10.1007/978-1-4899-0402-7_18

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051633600


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