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| 題名: | Relating sulfate and methane dynamics to geology: Accretionary prism offshore SW Taiwan |
| 作者: | 莊佩涓;Wallmann, Klaus;Haeckel, Matthias;Chuang, Pei-chuan;Chen, Hsiao-chi;Wang, Yunshuen;Dale, Andrew W;Chen, Nai-chen;Chung, San-hsiung;Sun, Chih-hsien;Chen, Hsuan-wen;You, Chen-feng;Horng, Chorng-shern;Lin, Saulwood;Yang, Tsanyao Frank |
| 貢獻者: | 地球科學學院地球科學學系 |
| 關鍵詞: | accretionary wedge;anaerobic oxidation of methane;bubble irrigation;Bubbles;Carbon dioxide;Chemical analysis;Continental margins;Fault lines;Faults;gas hydrate;Geochemistry;Geology;Iodides;Irrigation;Marine sediments;Methane;methane flux;Offshore;Offshore engineering;Particulate organic carbon;POC degradation;Ridges;Seawater;Sediments;Sulfates;Taiwan;Turbidity;Water analysis |
| 日期: | 2013-07-01 |
| 上傳時間: | 2026-04-23 11:42:20 (UTC+8) |
| 出版者: | Wiley-Blackwell;Washington: Amer Geophysical Union |
| 摘要: | 摘要： Geochemical data (CH4, SO42-, I-, Cl-, particulate organic carbon (POC), C-13-CH4, and C-13-CO2) are presented from the upper 30 m of marine sediment on a tectonic submarine accretionary wedge offshore southwest Taiwan. The sampling stations covered three ridges (Tai-Nan, Yung-An, and Good Weather), each characterized by bottom simulating reflectors, acoustic turbidity, and different types of faulting and anticlines. Sulfate and iodide concentrations varied little from seawater-like values in the upper 1-3 m of sediment at all stations; a feature that is consistent with irrigation of seawater by gas bubbles rising through the soft surface sediments. Below this depth, sulfate was rapidly consumed within 5-10 m by anaerobic oxidation of methane (AOM) at the sulfate-methane transition. Carbon isotopic data imply a mainly biogenic methane source. A numerical transport-reaction model was used to identify the supply pathways of methane and estimate depth-integrated turnover rates at the three ridges. Methane gas ascending from deep layers, facilitated by thrusts and faults, was by far the dominant term in the methane budget at all sites. Differences in the proximity of the sampling sites to the faults and anticlines mainly accounted for the variability in gas fluxes and depth-integrated AOM rates. By comparison, methane produced in situ by POC degradation within the modeled sediment column was unimportant. This study demonstrates that the geochemical trends in the continental margins offshore SW Taiwan are closely related to the different geological settings.
其他題名： Geochem. Geophys. Geosyst
出版者： Washington: Amer Geophysical Union
出版日期： 2013-07
出處： Geochemistry, geophysics, geosystems : G3, 2013-07, Vol.14 (7), p.2523-2545
資源來源： Alma/SFX Local Collection
版權： restricted use 2013. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess
版權： 2013. American Geophysical Union. All Rights Reserved.
識別號： ISSN: 1525-2027
識別號： EISSN: 1525-2027
識別號： DOI: 10.1002/ggge.20168 |
| 顯示於類別: | [地球科學學系] 期刊論文
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