• 责任者：Xu Zhaokai (Department of Oceanography ; Kunsan National University ; Kunsan 573-701 ; Korea) ; Choi Jinyong
• 刊名：Marine Geology & Quaternary Geology
• 出版年：2009
• 卷期：29(2)
• 关键词：深海沉积物 ; deep-sea sediments ; 碳酸盐矿物 ; carbonates ; 日本海 ; Japan Sea
• 页码：p.41-47
• 图表：4 illus., 2 tables, 29 refs.
• 分类号：0200
• issnNo：ISSN0256-1492
• isbnNo：CN37-1117/P

Authigenic carbonates collected from a sediment core on the western continental slope of East Japan Sea have been synthetically studied on X-ray diffraction (XRD), scanning electron microscope (SEM), geochemistry, and carbon and oxygen isotope. The analysis results on XRD and SEM show that carbonate minerals are mainly composed of authigenic high-Mg calcite (HMC) in grain shape, while authigenic elongate aragonite only appears in one layer. Combining the analysis on geochemical composition, the authors deduce that the studied carbonates come from fluids enriched in Ca²⁺, Mg²⁺, and HCO^3-. Therefore, the studied carbonates should precipitate from upward cold seep fluids enriched in methane, indicating the occurrence and dissociation of underlying gas hydrate.