Dating of pore waters with (129)I: relevance for the origin of marine gas hydrates

Pore waters associated with gas hydrates at Blake Ridge in the Atlantic Ocean were dated by measuring their iodine-129/iodine ratios. Samples collected from sediments with ages between 1.8 and 6 million years ago consistently yield ages around 55 million years ago. These ages, together with the stro...

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Bibliographic Details
Published inScience (American Association for the Advancement of Science) Vol. 289; no. 5488; pp. 2332 - 2335
Main Authors Fehn, U, Snyder, G, Egeberg, PK
Format Journal Article
LanguageEnglish
Published United States American Association for the Advancement of Science 29.09.2000
The American Association for the Advancement of Science
Subjects
Analysis
Chemicals
Gases
Iodine
Isotopes
Methods
Natural gas in submerged lands
Oceanography
Offshore gas fields
Organic Chemistry
Radioactive dating
Radioiodine
Radiometric dating
Sediments
Water
Water analysis
United States
ANW, Atlantic, Blake Ridge
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Summary:Pore waters associated with gas hydrates at Blake Ridge in the Atlantic Ocean were dated by measuring their iodine-129/iodine ratios. Samples collected from sediments with ages between 1.8 and 6 million years ago consistently yield ages around 55 million years ago. These ages, together with the strong iodine enrichment observed in the pore waters, suggest that the origin of iodine is related to organic material of early Tertiary age, which probably is also the source of the methane in the gas hydrates at this location.
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ISSN:0036-8075
1095-9203
DOI:10.1126/science.289.5488.2332