Methane-derived authigenic carbonates from the Ulleung basin sediments, East Sea of Korea SCIE SCOPUS

Cited 20 time in WEB OF SCIENCE Cited 20 time in Scopus
Title
Methane-derived authigenic carbonates from the Ulleung basin sediments, East Sea of Korea
Author(s)
Lim, Dhongil; Choi, Jinyong; Xu, Zhaokai; Kim, Moonkoo; Choi, Donglim; Jung, Hoisoo; Lee, Panmook
KIOST Author(s)
Lim, Dhongil(임동일)Kim, Moonkoo(김문구)Jung, Hoi Soo(정회수)
Publication Year
2009-06-30
Abstract
Authigenic carbonates were sampled in methane-enriched piston core sediments collected from gas venting sites on the western continental slope of the Ulleung Basin, East Sea of Korea. Multidisciplinary investigations on these carbonates, including the scanning electronic microscope (SEM) observations and mineralogical-geochemical compositions, were carried out to identify the carbon and oxygen sources and the forming mechanism of these carbonates. The authigenic carbonates from the study area correspond to semi-consolidated, compact concretions or nodules ranging from 2 to 9 cm in size. X-ray diffraction and electron microprobe analyses showed that most of the sampled carbonate concretions were composed of almost purely authigenic high-Mg calcite (10.7-14.3 mol% MgCO(3)). Characteristically, microbial structures such as filaments and rods, which were probably associated with the authigenic minerals, were abundantly observed within the carbonate matrix. The carbonates were strongly depleted in delta(13)C (-33.85 parts per thousand to -39.53 parts per thousand Peedee Belemnite (PDB)) and were enriched in delta(18)O (5.16-5.60 parts per thousand PDB), indicating that the primary source of carbon is mainly derived from the anaerobic oxidation of methane. Such methane probably originated from the destabilization of the underlying gas hydrates as strongly supporting from the enriched (18)O levels. Furthermore, the strongly depleted delta(13)C values (-60.7 parts per thousand to -61.6 parts per thousand PDB) of the sediment void gases demonstrate that the majority of the gas venting at the Ulleung Basin is microbial methane by CO(2) reduction. This study provides another example for the formation mechanism of methane-derived authigenic carbonates associated with gas-hydrate decomposition in gas-seeping pockmark environments. (c) 2009 Elsevier Ltd. All rights reserved.
ISSN
0278-4343
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4280
DOI
10.1016/j.csr.2009.04.013
Bibliographic Citation
CONTINENTAL SHELF RESEARCH, v.29, no.13, pp.1588 - 1596, 2009
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
SOUTH CHINA SEA; GULF-OF-MEXICO; GAS HYDRATE; SULFATE REDUCTION; SEEP CARBONATES; BLACK-SEA; HYDROCARBON SEEPS; CONTINENTAL-SLOPE; MG CALCITE; PRECIPITATION
Keywords
Authigenic carbonates; Methane seep environments; Gas hydrate; East Sea (Japan Sea)
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Marine Geochemistry,Paleoceanography,Marine Pollution,해양지화학,고해양학,해양오염학

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