Isotopically heavy oxygen-containing siderite derived from the decomposition of methane hydrate

Journal Article · Tue Aug 01 00:00:00 EDT 1989 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1989)017<0707:IHOCSD>2.3.CO;2· OSTI ID:7154757

Matsumoto, R ^[1]

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1. Univ. of Tokyo (Japan)

Authigenic siderite from the Miocene and Pliocene sediments of the Blake Outer Ridge formed in a methane fermentation zone in equilibrium with anomalously heavy oxygen water, as evidenced by its heavy-carbon ({minus}1.6 to +12.5 {delta}{sup 13}C) and heavy-oxygen (+0.1 to +7.9 {delta}{sup 18}O) values. Blake Outer Ridge sediments are impregnated with methane hydrate, which is generally enriched in {sup 18}O relative to ambient water. This suggests that decomposition of methane hydrate and subsequent release of large amounts of methane and heavy oxygen water affected the formation of the {sup 18}O-enriched siderite. Gas hydrate reaction in sediments is an important process for causing a dramatic variation of oxygen isotopic composition of the interstitial water and of authigenic carbonates formed during burial diagenesis.

• OSTI ID: 7154757
• Journal Information: Geology; (USA), Vol. 17:8; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
GAS HYDRATES
DECOMPOSITION
SIDERITE
OXYGEN ENRICHMENT
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COASTAL REGIONS
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GEOLOGIC HISTORY
INTERSTITIAL WATER
ISOTOPE RATIO
METHANE
NATURAL GAS DEPOSITS
ORIGIN
OXYGEN 18
SEDIMENTS
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ALKANES
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHEMICAL REACTIONS
ENRICHMENT
EVEN-EVEN NUCLEI
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GEOLOGIC DEPOSITS
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HYDRATES
HYDROCARBONS
HYDROGEN COMPOUNDS
IRON CARBONATES
IRON COMPOUNDS
IRON ORES
ISOTOPES
LIGHT NUCLEI
MINERAL RESOURCES
MINERALS
NORTH AMERICA
NUCLEI
ORES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
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STABLE ISOTOPES
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USA
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030200* - Natural Gas- Reserves
Geology
&amp; Exploration