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A study of the process of joint formation of methane gas-hydrate and authigenic carbonates in bottom sediments in the Sea of Okhotsk

Journal Article:

Abstract

The discovery of gas-hydrates in bottom sediments in the Sea of Okhotsk has allowed isotope fractionation of oxygen and hydrogen to be determined in the formation of the crystal lattice. It was established that the structure of gas-hydrate selectively included the heavier isotopes of oxygen and hydrogen, so that the gas-hydrate water had values of {delta}{sup 18}O = +1.9 per mille and {delta}D = +23 per mille, whereas the interstitial water was ''lighter'' in isotopes, with the values of {delta}{sup 18}O = -0.5 per mille and {delta}D = -5 per mille (relative to SMOW (standard mean ocean water)). The formation of gas-hydrates under the conditions of underwater discharge of methane alters the chemical composition of interstitial water, so that the carbonate equilibrium is shifted, and carbonates of authigenic origin are formed. The isotope composition of the carbonates is characterized by a low content of {sup 13}C({delta}{sup 13}C from -39.3 to -51.8 per mille PDB) and a high content of {sup 18}O({delta}{sup 18}O from + 2.7 to +6.3 per mille PDB) in comparison with carbonates of sea origin. These characteristics of the isotope composition suggest the participation of methane in the formation of authigenic carbonates, due to its anaerobic oxidation and  More>>
Authors:
Esikov, A D; [1]  Pashkina, V I [2] 
  1. AN SSSR, Moscow (USSR). Water Problems Inst.
  2. AN SSSR, Moscow (USSR). Inst. Okeanologii
Publication Date:
Jan 01, 1990
Product Type:
Journal Article
Reference Number:
AIX-21-058160; EDB-90-106659
Resource Relation:
Journal Name: Nuclear Geophysics (International Journal of Radiation Applications and Instrumentation, Part E); (UK); Journal Volume: 4:1
Subject:
03 NATURAL GAS; 58 GEOSCIENCES; GEOCHEMISTRY; ISOTOPE RATIO; CALCIUM CARBONATES; GAS HYDRATES; METHANE; NATURAL GAS HYDRATE DEPOSITS; SEAS; SEDIMENTS; USSR; ALKALINE EARTH METAL COMPOUNDS; ALKANES; ASIA; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATES; CHEMISTRY; EASTERN EUROPE; EUROPE; GEOLOGIC DEPOSITS; HYDRATES; HYDROCARBONS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; SURFACE WATERS; 030200* - Natural Gas- Reserves, Geology, & Exploration; 580000 - Geosciences
OSTI ID:
6928507
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0886-0130; CODEN: NUGEE
Submitting Site:
GBN
Size:
Pages: 135-141
Announcement Date:
Aug 01, 1990

Journal Article:

Citation Formats

Esikov, A D, and Pashkina, V I. A study of the process of joint formation of methane gas-hydrate and authigenic carbonates in bottom sediments in the Sea of Okhotsk. United Kingdom: N. p., 1990. Web.
Esikov, A D, & Pashkina, V I. A study of the process of joint formation of methane gas-hydrate and authigenic carbonates in bottom sediments in the Sea of Okhotsk. United Kingdom.
Esikov, A D, and Pashkina, V I. 1990. "A study of the process of joint formation of methane gas-hydrate and authigenic carbonates in bottom sediments in the Sea of Okhotsk." United Kingdom.
@misc{etde_6928507,
title = {A study of the process of joint formation of methane gas-hydrate and authigenic carbonates in bottom sediments in the Sea of Okhotsk}
author = {Esikov, A D, and Pashkina, V I}
abstractNote = {The discovery of gas-hydrates in bottom sediments in the Sea of Okhotsk has allowed isotope fractionation of oxygen and hydrogen to be determined in the formation of the crystal lattice. It was established that the structure of gas-hydrate selectively included the heavier isotopes of oxygen and hydrogen, so that the gas-hydrate water had values of {delta}{sup 18}O = +1.9 per mille and {delta}D = +23 per mille, whereas the interstitial water was ''lighter'' in isotopes, with the values of {delta}{sup 18}O = -0.5 per mille and {delta}D = -5 per mille (relative to SMOW (standard mean ocean water)). The formation of gas-hydrates under the conditions of underwater discharge of methane alters the chemical composition of interstitial water, so that the carbonate equilibrium is shifted, and carbonates of authigenic origin are formed. The isotope composition of the carbonates is characterized by a low content of {sup 13}C({delta}{sup 13}C from -39.3 to -51.8 per mille PDB) and a high content of {sup 18}O({delta}{sup 18}O from + 2.7 to +6.3 per mille PDB) in comparison with carbonates of sea origin. These characteristics of the isotope composition suggest the participation of methane in the formation of authigenic carbonates, due to its anaerobic oxidation and the involvement of sulfate in the silt water. (author).}
journal = {Nuclear Geophysics (International Journal of Radiation Applications and Instrumentation, Part E); (UK)}
volume = {4:1}
journal type = {AC}
place = {United Kingdom}
year = {1990}
month = {Jan}
}