Salinization of porewater in a multiple aquitard-aquifer system in Jiangsu coastal plain, China
Salinization of porewater in a multiple aquitard-aquifer system in Jiangsu coastal plain, China
复制标题
江苏沿海平原多重弱透水层-含水层系统孔隙水盐化
DOI：
10.1007/s10040-017-1622-0
复制
发表时间：
2017-07
影响因子：
2.8
通讯作者：
Jin Menggui
中科院分区：
文献类型：
--
作者：
Li Jing;Liang Xing;Zhang Yanian;Liu Yan;Chen Naijia;Alhassan Abubakari;Jin Menggui
对江苏沿海平原某粘土质含水层的孔隙水进行了化学和同位素分析，以解释其盐度来源、化学演化和水团混合过程。在较宽的Cl -浓度范围（396 ~ 9720 mg/L）内，盐化出水孔隙水的Cl/Br比值为154，具有较强的地球化学指纹图谱，表明孔隙水的盐度可能是由旧盐水混合而来，其比例小于20%。盐水的贡献很小，对水稳定同位素的影响有限。孔隙水δ 18o和δ d的关系表明，浅层和中层孔隙水可能是原始海水，随后被现代大气水稀释，而稳定同位素值耗尽的深层孔隙水可能在较冷时期被补充，并受到蒸发和海水入渗的影响。伴生地层的阳离子- cl关系和矿物学特征表明，孔隙水经过硅酸盐风化和离子交换反应的化学修饰。87 Sr/86 Sr比值为0.7094 ~ 0.7112，进一步确认了硅酸盐矿物的输入来源。采用数值模拟方法评价了深层孔隙水盐度的长期演化。边界条件的变化（即第3含水层在约70 ka BP与盐水混合，随后在20-25 ka BP冰川融水补给，然后在7-10 ka BP与全新世海水混合）是孔隙水盐度变化的原因。这与前人对江苏沿海平原古海侵退的研究结果相吻合。
Chemical and isotopic compositions were analyzed in porewater squeezed from a clayey aquitard in Jiangsu coastal plain, eastern China, to interpret the salinity origin, chemical evolution and water-mass mixing process. A strong geochemical fingerprint was obtained with an aligned Cl/Br ratio of 154 in the salinized aquitard porewater over a wide Cl− concentration range (396–9,720 mg/L), indicating that porewater salinity is likely derived from a mixing with old brine with a proportion of less than 20%. Very small contributions of brine exerted limited effects on water stable isotopes. The relationships between porewater δ 18 O and δD indicate that shallow and intermediate porewaters could be original seawater and were subsequently diluted with modern meteoric water, whereas deep porewaters with depleted stable isotopic values were probably recharged during a cooler period and modified by evaporation and seawater infiltration. The cation–Cl relationship and mineralogy of associated strata indicate that porewater has been chemically modified by silicate weathering and ion-exchange reactions. 87 Sr/86 Sr ratios of 0.7094–0.7112 further confirm the input source of silicate minerals. Numerical simulations were used to evaluate the long-term salinity evolution of the deep porewater. The alternations of boundary conditions (ie, the third aquifer mixed with brine at approximately 70 ka BP, followed by recharge of glacial meltwater at 20–25 ka BP, and then mixing with Holocene seawater at 7–10 ka BP) are responsible for the shift in porewater salinity. These timeframes correspond with the results of previous studies on ancient marine transgression-regression in Jiangsu coastal plain.
登录
查看更多内容
影响因子：
5.4
作者：
S. Worland;G. Hornberger;S. Goodbred
通讯作者：
S. Worland;G. Hornberger;S. Goodbred
影响因子：
5
作者：
Corinne I. Wong;J. Banner;M. Musgrove
通讯作者：
Corinne I. Wong;J. Banner;M. Musgrove
DOI：
--
发表时间：
2011-09
期刊：
--
影响因子：
--
作者：
M. Demlie;N. Jovanovic;S. Naicker
通讯作者：
M. Demlie;N. Jovanovic;S. Naicker
DOI：
--
发表时间：
2011
期刊：
--
影响因子：
--
作者：
Zhang Wen-jie
通讯作者：
Zhang Wen-jie
影响因子：
3.9
作者：
H. Kwong;J. Jiao;Kun Liu;Haipeng Guo;Shouye Yang
通讯作者：
H. Kwong;J. Jiao;Kun Liu;Haipeng Guo;Shouye Yang