What question did this study set out to answer?

To characterize the mineralogy, fabric, and isotopic composition of authigenic carbonates associated with massive gas hydrates and evaluate their relationship to hydrate stability.

January 1, 1998Geology

Authigenic carbonates from the Cascadia subduction zone and their relation to gas hydrate stability

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To characterize the mineralogy, fabric, and isotopic composition of authigenic carbonates associated with massive gas hydrates and evaluate their relationship to hydrate stability.
Sampled the uppermost 50 cm of marine sediments from the southern summit of Hydrate Ridge during RV Sonne cruise SO110.
Analyzed mineralogical composition, fabric structure, and oxygen isotope values (δ18O) of carbonate phases relative to ambient pore fluids.
Identified two distinct carbonate phases: microcrystalline high-magnesium calcite containing 14 to 19 mol% MgCO3 and pure aragonite forming botryoidal and isopachous aggregates within hydrate cavities.
Determined distinct oxygen isotope values of δ18O = 3.68‰ PDB for aragonite and δ18O = 4.86‰ PDB for high-magnesium calcite.
Demonstrated that aragonite precipitated in equilibrium with normal pore waters, whereas high-magnesium calcite precipitated from fluids enriched in 18O released during gas hydrate destabilization.

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Implication

Geological analysis reveals distinct carbonate mineralogies in Cascadia margin sediments, indicating mineral precipitation driven by gas hydrate destabilization.

Cite This Study

Bohrmann et al. (1998) studied this question.

synapsesocial.com/papers/6a1e653f09554abc3868c603 https://doi.org/10.1130/0091-7613(1998)026<0647:acftcs>2.3.co;2

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Implication

Geological analysis reveals distinct carbonate mineralogies in Cascadia margin sediments, indicating mineral precipitation driven by gas hydrate destabilization.

Authigenic carbonates from the Cascadia subduction zone and their relation to gas hydrate stability

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Discussion

Implication

Cite This Study

Authigenic carbonates from the Cascadia subduction zone and their relation to gas hydrate stability

Key Points

Discussion

Implication

Cite This Study

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