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| Chen, Nai-chen; Yang, Tsanyao Frank; Hong, Wei-li; Chen, Hsuan-wen; Chen, Hsiao-chi; Hu, Ching-yi; Huang, Yu-chun; Lin, Saulwood; Lin, Li-hung; Su, Chih-chieh; Liao, Wei-zhi; Sun, Chih-hsien; Wang, Pei-ling; Yang, Tao; Jiang, Shao-yong; Liu, Char-shine; Wang, Yunshuen; Chung, San-hsiung. |
| To systematically quantify the production, consumption and migration of methane along a continental margin, 210 sediment cores were collected from offshore southwestern Taiwan and analyzed for their gas and aqueous geochemistry. These data, combined with published results, were used to calculate the diffusive methane fluxes across different geochemical transitions and to develop scenarios of mass balance to constrain deep microbial and thermogenic methane production rates within the accretionary prism. The results showed that methane diffusive fluxes ranged from 2.71 × 10−3 to 2.78 × 10−1 and from ‒1.88 × 10−1 to 3.97 mmol m−2 d−1 at the sulfate-methane-transition-zone (SMTZ) and sediment-seawater interfaces, respectively. High methane fluxes tend to be... |
| Tipo: Text |
Palavras-chave: Thermal maturation; Methanogenesis; Anaerobic methanotrophy; Methane efflux; Subduction; Taiwan. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00393/50412/51132.pdf |
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| Chuang, Pei-chuan; Dale, Andrew W.; Wallmann, Klaus; Haeckel, Matthias; Yang, Tsanyao Frank; Chen, Nai-chen; Chen, Hsiao-chi; Chen, Hsuan-wen; Lin, Saulwood; Sun, Chih-hsien; You, Chen-feng; Horng, Chorng-shern; Wang, Yunshuen; Chung, San-hsiung. |
| 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... |
| Tipo: Text |
Palavras-chave: Gas hydrate; Methane flux; Bubble irrigation; Anaerobic oxidation of methane; POC degradation; Accretionary wedge; Taiwan. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00264/37514/35843.pdf |
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| Schnurle, Philippe; Liu, Char-shine; Lin, Andrew T.; Lin, Saulwood. |
| A dense seismic reflection survey with up to 250-m line-spacing has been conducted in a 15 × 15 km wide area offshore southwestern Taiwan where Bottom Simulating Reflector is highly concentrated and geochemical signals for the presence of gas hydrate are strong. A complex interplay between north–south trending thrust faults and northwest–southeast oblique ramps exists in this region, leading to the formation of 3 plunging anticlines arranged in a relay pattern. Landward in the slope basin, a north–south trending diapiric fold, accompanied by bright reflections and numerous diffractions on the seismic profiles, extends across the entire survey area. This fold is bounded to the west by a minor east-verging back-thrust and assumes a symmetric shape, except at... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00056/16754/14248.pdf |
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