塞尔基奥(Serchio)山谷是意大利托斯卡纳地区地震危险性最高的地方之一。研究地球化学和水文过程是托斯卡纳区域政府资助的地震预防、预测试点项目的一部分,通过调查皮耶韦福斯切纳村附近的普拉迪拉马(Pra di Lama)的热水化学组成,评估...塞尔基奥(Serchio)山谷是意大利托斯卡纳地区地震危险性最高的地方之一。研究地球化学和水文过程是托斯卡纳区域政府资助的地震预防、预测试点项目的一部分,通过调查皮耶韦福斯切纳村附近的普拉迪拉马(Pra di Lama)的热水化学组成,评估该地点是否适合进行地震地球化学前兆监测。调查方案既利用了随机取水样调查的化学分析结果,还选用了自动化台站连续测定的物理化学参数。选定的物理化学参数的连续信号是利用一套专用参数传感器自动测量的。为定量描述在深部中生代含水层发生的水—岩相互作用,采用地球化学模拟技术处理了水中溶解的主要无机组分浓度。结合这些资料,确定了该地热系统的地球化学背景,并详细描述了补给泉水的地热水层的综合水文地质和地球化学模型。根据长时间观测的物理和地球化学参数的微小变化,在地下水较长、较深的循环路径中,局部地壳应变监测参数的位置敏感性以及对地震活动构造的相近性等,可以确定皮耶韦福斯切纳地热系统是确定流体可能与深部地震孕育过程中诱发的能量释放和渗透率变化有关的有利场所。本文提出的综合地质、水文地质、地球化学和建模方法有益于其他地方类似的工程设计。展开更多
For the purpose of understanding the weathering characteristics of surface layers in purple mudstone sloping fields of the Three Gorges Reservoir area of China, oxide content of major elements, composition of clay min...For the purpose of understanding the weathering characteristics of surface layers in purple mudstone sloping fields of the Three Gorges Reservoir area of China, oxide content of major elements, composition of clay minerals, magnetic susceptibility, and difference in weathering characteristics of surface layers under different slope gradients were determined. The results showed that the oxide content of Si, Al, and Fe ranged from 60% to 75% and the weathering coefficient with depth showed no trend along the slope gradient. Also, for gentle (10° and 15°) and intermediate (25° and 40°) slopes the clay relative diffraction peak for kaolinite at the surface between 0-10 cm and 10-20 cm declined with an increase in slope gradient, while the relative diffraction peak for kaolinite in weathered layers on steep slopes (50° and 60°) disappeared altogether. Magnetic susceptibility decreased with increasing depth and, for a given depth layer, decreased with an increase in slope gradient. Analysis of the oxide content, weathering coefficients, clay minerals, and magnetic susceptibility showed that in the Three Gorges Reservoir area, the pedogenesis of the weathering layer in purple mudstone sloping fields was weak with weaker soil formation going from gentle slope to steep slope.展开更多
From the study of the Strengbach and Ringelbach watersheds we propose to illustrate the interest of combining the geochemical tracing and geochemical modeling approaches on surface and deep borehole waters,to decipher...From the study of the Strengbach and Ringelbach watersheds we propose to illustrate the interest of combining the geochemical tracing and geochemical modeling approaches on surface and deep borehole waters,to decipher the diversity of the water flow and the associated water–rock interactions in such elementary mountainous catchments. The results point to a clear geochemical typology of waters depending on the water circulations(deep vs. hypodermic) within the substratum.展开更多
A study was conducted by collecting eight seepage water samples that drain through the sedimentary rocks, mainly sandstone and shale, to evaluate the hydro- geochemical characteristics. The collected samples were anal...A study was conducted by collecting eight seepage water samples that drain through the sedimentary rocks, mainly sandstone and shale, to evaluate the hydro- geochemical characteristics. The collected samples were analyzed for physico-chemical parameters using standard procedures. Three water types were identified in the Piper plot and the hydrogeochemical evolution starts from a Ca- C1 facies （type 1） via mixed Ca-Mg-C1 and Ca-Na-HCO3 facies （type 2） to Na-C1 facies （type 3）. Increasing trend of electrical conductivity （EC） values were observed from type 1 water to type 3 water. Lower ionic concentrations with an average EC value of 35.7 kts/cm in Ca-C1 facies indicate the recharge water by monsoonal rainfall, and ion exchange/weathering process is reflected in the mixing zone. Higher ionic concentration with an average EC value of 399 kts/cm is noted in Na-C1 facies, which indicates the ion exchange during water-rock interaction. Higher log pCO2 values are also found in this facies, revealing the longer residence time of seepage water in the rock matrix, which release more ions into the water. The relative mobility of elements during weathering suggest that the order of mobility in both sandstone and shale is Na 〉 Ca 〉 Mg 〉 K. It was observed that thehydrogeochemistry of seepage water is mainly controlled by the bedrock geology.展开更多
文摘塞尔基奥(Serchio)山谷是意大利托斯卡纳地区地震危险性最高的地方之一。研究地球化学和水文过程是托斯卡纳区域政府资助的地震预防、预测试点项目的一部分,通过调查皮耶韦福斯切纳村附近的普拉迪拉马(Pra di Lama)的热水化学组成,评估该地点是否适合进行地震地球化学前兆监测。调查方案既利用了随机取水样调查的化学分析结果,还选用了自动化台站连续测定的物理化学参数。选定的物理化学参数的连续信号是利用一套专用参数传感器自动测量的。为定量描述在深部中生代含水层发生的水—岩相互作用,采用地球化学模拟技术处理了水中溶解的主要无机组分浓度。结合这些资料,确定了该地热系统的地球化学背景,并详细描述了补给泉水的地热水层的综合水文地质和地球化学模型。根据长时间观测的物理和地球化学参数的微小变化,在地下水较长、较深的循环路径中,局部地壳应变监测参数的位置敏感性以及对地震活动构造的相近性等,可以确定皮耶韦福斯切纳地热系统是确定流体可能与深部地震孕育过程中诱发的能量释放和渗透率变化有关的有利场所。本文提出的综合地质、水文地质、地球化学和建模方法有益于其他地方类似的工程设计。
基金Project supported by the National Natural Science Foundation of China (No. 40272126)the Nanjing University Startup Foundation for Young Scholar (No. 0209005116).
文摘For the purpose of understanding the weathering characteristics of surface layers in purple mudstone sloping fields of the Three Gorges Reservoir area of China, oxide content of major elements, composition of clay minerals, magnetic susceptibility, and difference in weathering characteristics of surface layers under different slope gradients were determined. The results showed that the oxide content of Si, Al, and Fe ranged from 60% to 75% and the weathering coefficient with depth showed no trend along the slope gradient. Also, for gentle (10° and 15°) and intermediate (25° and 40°) slopes the clay relative diffraction peak for kaolinite at the surface between 0-10 cm and 10-20 cm declined with an increase in slope gradient, while the relative diffraction peak for kaolinite in weathered layers on steep slopes (50° and 60°) disappeared altogether. Magnetic susceptibility decreased with increasing depth and, for a given depth layer, decreased with an increase in slope gradient. Analysis of the oxide content, weathering coefficients, clay minerals, and magnetic susceptibility showed that in the Three Gorges Reservoir area, the pedogenesis of the weathering layer in purple mudstone sloping fields was weak with weaker soil formation going from gentle slope to steep slope.
基金financially supported by funding from the CPER-Alsace REALISE program,the Equipex program CRITEX,the CNRS SOERE RBV and the LABEX"G-Eau-Thermie profonde"funding from the French ANR Program under grant agreement ANR-15-CE06-0014(Projet CANTAREAlsace)
文摘From the study of the Strengbach and Ringelbach watersheds we propose to illustrate the interest of combining the geochemical tracing and geochemical modeling approaches on surface and deep borehole waters,to decipher the diversity of the water flow and the associated water–rock interactions in such elementary mountainous catchments. The results point to a clear geochemical typology of waters depending on the water circulations(deep vs. hypodermic) within the substratum.
基金University of Malaya for the rock analysis by payment basis through RPI fund
文摘A study was conducted by collecting eight seepage water samples that drain through the sedimentary rocks, mainly sandstone and shale, to evaluate the hydro- geochemical characteristics. The collected samples were analyzed for physico-chemical parameters using standard procedures. Three water types were identified in the Piper plot and the hydrogeochemical evolution starts from a Ca- C1 facies （type 1） via mixed Ca-Mg-C1 and Ca-Na-HCO3 facies （type 2） to Na-C1 facies （type 3）. Increasing trend of electrical conductivity （EC） values were observed from type 1 water to type 3 water. Lower ionic concentrations with an average EC value of 35.7 kts/cm in Ca-C1 facies indicate the recharge water by monsoonal rainfall, and ion exchange/weathering process is reflected in the mixing zone. Higher ionic concentration with an average EC value of 399 kts/cm is noted in Na-C1 facies, which indicates the ion exchange during water-rock interaction. Higher log pCO2 values are also found in this facies, revealing the longer residence time of seepage water in the rock matrix, which release more ions into the water. The relative mobility of elements during weathering suggest that the order of mobility in both sandstone and shale is Na 〉 Ca 〉 Mg 〉 K. It was observed that thehydrogeochemistry of seepage water is mainly controlled by the bedrock geology.
