동해에서 산출한 메탄관련 자생탄산염: 광물, 지화학적 특성

Title
동해에서 산출한 메탄관련 자생탄산염: 광물, 지화학적 특성
Alternative Title
Methane-related authigenic carbonates from the East Sea, Korea:Mineralogical and geochemical characterization
Author(s)
우경식; 김진경; 박장준; 현상민
KIOST Author(s)
Hyun, Sangmin(현상민)
Publication Year
2009-04-01
Abstract
Authigenic carbonates related to gas hydrates were discovered from the cores in the Ulleung Basin, East Sea. Carbonateconcretions range from 3 to 6 cm in diameter, and display irregular shapes. The inside of concretions issometimes porous and shows internal layering. Concretions are composed of aragonite or high Mg-calcite, or thecombination of both. Calcite crystals are micritic and include planktonic foraminifers, diatoms, silt-sized, detritalquartz grains, and authigenic framboidal pyrites. Ultra-textural examination reveals that acicular aragonites grewas cements between micritic calcite crystals, and this suggests that micritic calcite precipitated prior to aciculararagonite. Oxygen and carbon isotopic compositions of carbonate concretions range from +2 to +5 per mil (PDB)and from -44 to -39 per mil (PDB), respectively. These depleted carbon isotopic compositions indicate that thecarbon source for the formation of authigenic carbonates were gas hydrates below, and the carbonates were formedby the oxidation of methane. Relatively narrow range of carbon isotope values, compared to those of other authigeniccarbonates reported elsewhere, indicates similar diagenetic environments of formation for these concretions.Distinctive clusters of stable isotope values regardless of mineralogy imply that carbonate concretions formed in aclosed-diagenetic system.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/29590
Bibliographic Citation
EGU, pp.1, 2009
Publisher
EGU
Type
Conference
Language
English
Publisher
EGU
Related Researcher
Research Interests

Marine environmentology,Marine environmentology,Organic chemistry,해양환경학,화학해양학,유기화학

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