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Mud volcano gas hydrates in the Gulf of Cadiz
Author(s) -
Mazurenko L. L.,
Soloviev V. A.,
Belenkaya I.,
Ivanov M. K.,
Pinheiro L. M.
Publication year - 2002
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1046/j.1365-3121.2002.00428.x
Subject(s) - mud volcano , clathrate hydrate , geology , volcano , volume (thermodynamics) , geochemistry , gas composition , sediment , mineralogy , hydrate , petrology , geomorphology , chemistry , thermodynamics , physics , organic chemistry
This paper presents new geochemical data on gas‐hydrate‐bearing mud volcanoes discovered for the first time in the Gulf of Cadiz during cruises TTR9 and TTR10 of the R/V Professor Logachev in 1999–2000. The estimated gas hydrate content is 3–16% of sediment volume and 5–31% of pore space volume. Estimated values of the water isotopic composition for the Ginsburg mud volcano are very heavy for δ 18 O (up to +53‰) and light for δD (up to − 210‰). Gas released from the hydrates contains 81% of C 1 and 19% of C 2+ . The inferred source of the gas in the hydrates is enriched in C 2 –C 6 (≤ 5%), indicating that the gas has a thermogenic origin. Gas hydrate of cubic structure II should be formed from a gas of such composition. It is interpreted that the composition of the mud volcano fluid corresponds to deep oil basins below the Gulf of Cadiz.