珠江口淇澳岛海岸带沉积物中硫酸盐还原 和不同形态硫的分布

尹希杰; 周怀阳; 杨群慧; 孙治雷

珠江口淇澳岛海岸带沉积物中硫酸盐还原和不同形态硫的分布

1.
国家海洋局第三海洋研究所海洋与海岸地质环境开放实验室,福建厦门 361005;中国科学院广州地球化学研究所,广东广州 510640
2.
中国科学院广州地球化学研究所,广东广州 510640;同济大学海洋地质国家重点实验室,上海 200092
3.
中国科学院广州地球化学研究所,广东广州 510640

基金项目: 国家海洋局第三海洋研究所基本科研业务费专项资金资助项目(海三科2009013);中国大洋协会国际海底区域研究开发"十一五"项目——深海生物地球化学过程在地质体中的记录研究(DYXM-115-02-4-04);"九○八"专项成果集成项目——中国近海海洋底质调查研究(908-ZC-I-05)。

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出版历程
- 收稿日期: 2009-04-15
- 修回日期: 2009-11-18

Sulfate reduction and reduced sulfur speciation in the coastal sediments of Qi’ao Island in the Zhujiang Estuary in China

1.
Third Institute of Oceanography,State Oceanic Administration,Xiamen 361005, China;Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
3.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

摘要

摘要: 对珠江口淇澳岛海岸带3个站位(QA-11,QA-9和 QA-14)的沉积物中不同形态的还原硫(酸可挥发性硫,黄铁矿和有机硫)、总有机碳(TOC)和孔隙水中SO^2-₄,甲烷浓度进行了测定,并且利用稳态扩散模型计算其中2个站位(QA-9和QA-14)硫酸盐还原通量和甲烷厌氧氧化通量。研究结果表明由于潮间带沉积物受到SO^2-₄供给的限制,因此位于潮间带的QA-11站位硫酸盐还原带较浅(约16 cm);在潮下带的QA-9和
- 硫酸盐还原 /
- 甲烷厌氧氧化 /
- 酸可挥发性硫 /
- 黄铁矿 /
- 有机硫 /
- 甲烷
Abstract: The concentrations of methane and sulfate in pore-water and pools of reduced sulfur compounds (acid volatile sulfur, pyrite and organic sulfur) and total organic carbon in sediment were determined at three sites (QA-11, QA-9 and QA-14) in the shore sediments of Qi’ao Island in the Zhujiang Estuary. By using a steady state diffusive model,sulfate reduction and anaerobic oxidation methane fluxes were calculated from pore-water sulfate and methane profiles. The sulfate reduction flux equaled 1.74 and 1.14 mmol/(m²·d) at Sites QA-9 and QA-14, and the methane anaerobic flux equaled 0.34 and 0.29 mmol/(m²(d) respectively.Because the sulfate supply from overlying water is limited in intertidal sediment, the depth of sulfate reduction zone is shallow at Site QA-11. With the increasing of the distance from the coast and the seawater depth, the sulfate reduction flux gradually decreased from Sites QA-9 to QA-14 located in the subtidal zone, sulfate reduction might be controlled by the supply of organic matter in sediment, meanwhile the contribution of the anaerohic oxidation of methane to the sulfate reduction increased from 19.2% to 25.5％. The results show that according to the order of high to low content of reduced sulfur of different forms in sediment they are organic sulfur,pyrite,acid volatile sulfur. The concentration of AVS and the sulfate reduction flux showed obvious correlation in the sedimentary cores of three sites. The values of the sulfur content ratio of pyrite to AVS were 7.9 and 3.6 at Sites QA-11 and QA-14 respectively, suggesting that AVS could be transformed to pyrite efficiently and the sulfate reduction was likely to limit formation of pyrite in the sediments, and the sulfur content ratio of pyrite to AVS being less than 3, with value of 2.2, at Site QA-9 indicated that sulfide mineralization was limited by the availability of highly reactive iron.
- sulfate reduction /
- anaerobic oxidation of methane /
- acid volatile sulfur /
- pyrite /
- organic sulfur /
- methane

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