Dissolved inorganic carbon (DIC) and its carbon isotopic composition in sediment pore waters from the Shenhu area, northern South China Sea
Dissolved inorganic carbon (DIC) and its carbon isotopic composition in sediment pore waters from the Shenhu area, northern South China Sea
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南海北部神狐海域沉积物孔隙水中溶解无机碳(DIC)及其碳同位素组成
DOI：
10.1007/s10872-008-0024-2
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发表时间：
2008-04
影响因子：
2.3
通讯作者：
Lu, Ge
中科院分区：
文献类型：
--
作者：
Yang, Jing-Hong;Wu, Neng-You;Liu, Jian;Yang, Tao;Jiang, Shao-Yong;Chen, Dao-Hua;Lu, Ge
神狐地区是南海北方陆坡区天然气水合物最有利的赋存场所之一。在该地区的两个活塞岩心（SH-A和SH-B）中采集孔隙水样品，测定了硫酸盐和溶解无机碳（DIC）的浓度及其碳同位素组成。数据显示DIC变化大，δ 13 C-DIC值非常负。在沉积物系统中确定了两个反应区，0-3 mbsf和3 mbsf以下。在站点SH-A，上部区域（0-3 mbsf）显示相对恒定的硫酸盐和DIC浓度以及δ 13 C-DIC值，可能是由于生物扰动和流体平流。下部区域（低于3 mbsf）显示硫酸盐和DIC浓度以及δ 13 C-DIC值的良好线性梯度。在站点SH-B，两个区域都显示出线性梯度，但δ 13 C-DIC和SO 42 −在低于3 mbsf的下部区域的下降梯度大于上部区域0-3 mbsf的下降梯度。计算的两个岩心的硫酸盐-甲烷界面（SMI）深度分别为10.0 m和11.1 m。DIC和δ 13 C-DIC的深度剖面与世界大洋中其他天然气水合物分布区（如布莱克海岭）的深度剖面具有相似的特征。总体而言，我们的研究结果表明，厌氧甲烷氧化（AMO）过程中的沉积物中的大甲烷通量从深度在研究区域，这可能是连接到该地区的天然气水合物的形成。
The Shenhu area is one of the most favorable places for the occurrence of gas hydrates in the northern continental slope of the South China Sea. Pore water samples were collected in two piston cores (SH-A and SH-B) from this area, and the concentrations of sulfate and dissolved inorganic carbon (DIC) and its carbon isotopic composition were measured. The data revealed large DIC variations and very negativeδ13C-DIC values. Two reaction zones, 0–3 mbsf and below 3 mbsf, are identified in the sediment system. At site SH-A, the upper zone (0–3 mbsf) shows relatively constant sulfate and DIC concentrations andδ13C-DIC values, possibly due to bioturbation and fluid advection. The lower zone (below 3 mbsf) displays good linear gradients for sulfate and DIC concentrations, andδ13C-DIC values. At site SH-B, both zones show linear gradients, but the decreasing gradients forδ13C-DIC and SO42−in the lower zone below 3 mbsf are greater than those from the upper zone, 0–3 mbsf. The calculated sulfate-methane interface (SMI) depths of the two cores are 10.0 m and 11.1 m, respectively. The depth profiles of both DIC andδ13C-DIC showed similar characteristics as those in other gas hydrate locations in the world oceans, such as the Blake Ridge. Overall, our results indicate an anaerobic methane oxidation (AMO) process in the sediments with large methane flux from depth in the studied area, which might be linked to the formation of gas hydrates in this area.
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DOI：
10.2973/dsdp.proc.76.109.1983
发表时间：
1983-11
期刊：
--
影响因子：
--
作者：
G. Claypool;C. Threlkeld
通讯作者：
G. Claypool;C. Threlkeld
影响因子：
3
作者：
Borowski, WS;Paull, CK;Ussler, W
通讯作者：
Ussler, W
影响因子：
3.5
作者：
John J. Miller;M. Lee;R. Huene
通讯作者：
John J. Miller;M. Lee;R. Huene
影响因子：
5.3
作者：
E. Suess;M. Torres;G. Bohrmann;R. Collier;J. Greinert;P. Linke;G. Rehder;A. Tréhu;K. Wallmann-K.-Wallma
通讯作者：
E. Suess;M. Torres;G. Bohrmann;R. Collier;J. Greinert;P. Linke;G. Rehder;A. Tréhu;K. Wallmann-K.-Wallma
影响因子：
5
作者：
Yuan-hui Li;S. Gregory
通讯作者：
Yuan-hui Li;S. Gregory