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Isotopic Constraints on Hydrochemical Evolution of Groundwater in the Ordos Cretaceous Basin

Author: WuChunYong
Tutor: SuXiaoSi
School: Jilin University
Course: Groundwater Science and Engineering
Keywords: Ordos Basin Cretaceous aquifer Groundwater chemical evolution Factor Analysis Carbon isotope Sulfur isotope Strontium isotope
CLC: P641.12
Type: Master's thesis
Year: 2011
Downloads: 162
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Abstract


Ordos Cretaceous Basin's rich groundwater resources is an important water source area of ??socio-economic development and people's lives are dependent for energy exploration and development has made great contributions. Cretaceous aquifer groundwater as an important part of the water cycle in a long cycle, and environmental media with an extremely complex matter, energy and information exchange, the occurrence of a variety of physical, chemical and biological role, leading the evolution of the water chemistry in terms of time and space are constantly changing. Carry out in-depth study of the Ordos Cretaceous Basin groundwater chemical evolution favor the right to judge groundwater quality conditions, clear the value of the use of groundwater, to reveal groundwater circulation law and protect the ecological environment. In this paper, the basin geological and hydrogeological conditions, integrated use of factor analysis, the water chemistry analysis and environmental isotope tracer techniques, water chemical evolution of the main factors in the analysis of the impact of groundwater, the main source of analysis of the groundwater dissolved sulfate and strontium ions reveal the impact of groundwater dissolved inorganic carbon, sulfate and strontium isotope evolution main hydrogeochemical to analyze the chemical evolution of the groundwater, made the following main research: the basis of the distribution characteristics of the water chemistry in the order summary of groundwater on factor analysis research means hydrogeochemical change impact of groundwater hydrochemical characteristics. Sulfate mineral dissolution occurs mainly in the groundwater in the study area, the dissolution of carbonate minerals, silicate mineral dissolution and cation exchange interaction hydrogeochemical. The dilution effect of atmospheric precipitation in the shallow aquifer or bare rock group groundwater chemical characteristics. II summarizes the groundwater dissolved inorganic carbon evolution path, combined with an aqueous medium carbon isotope characteristics, the use of groundwater DIC concentration and its the measured δ13CDIC value calculation, pH, quantitative analysis and determine the study area aquifer groundwater dissolved inorganic carbon The evolution path. The vegetation of the study area, the coverage area for C3 vegetation coverage area, C3 and C4 vegetation mixed Health District. Relatively Basin, South District, Basin, Northern District groundwater open is good, most of the groundwater in the open system. Groundwater dissolved inorganic carbon evolution path the alternating cation adsorption evolution, gypsum dissolved calcite dissolution under the conditions of the evolution and closed system evolution, open system under the conditions of soil CO2 evolution occurs mainly in the North Central River group groundwater, the main dolomite differences yuan dissolved evolution occurred in the Basin, Southern District Luohe groundwater. Use of the Ordos Cretaceous Basin aqueous medium and the groundwater sulfur, oxygen isotope characteristics, the analysis of the main source of dissolved sulfate in the aquifer, reveal geochemical processes affect the the groundwater the sulphate evolution of biological and non-biological. The study area groundwater dissolved SO42-mainly derived from meteoric endogenous and supergene sulfate minerals dissolved. In addition to the evaporation concentrating can lead to groundwater SO42-concentration enrichment and control the main geochemical evolution of groundwater sulfate in the region including sulfate mineral dissolution and microbial sulfate reduction, both the evolution of each the aquiferous Group groundwater sulfate differences in the degree of influence, sulfate mineral dissolution widespread impact on the evolution of sulfate microbial sulfate reduction occurs only in the Eastern and Southern Districts western North District Luohe groundwater enrichment factor ε values -11.5 ‰ and -17.4 ‰. Fourth, the use of aqueous medium of the Ordos Cretaceous basin and groundwater strontium isotopic characteristics, the main source of strontium in the groundwater in the aquifer, reveal the impact of groundwater strontium isotopic evolution of water - rock interaction. The study area groundwater strontium is mainly derived from carbonate minerals, sulfate minerals and silicate minerals dissolved, the contribution of silicate minerals plagioclase than potassium feldspar. Evaporation concentrating and water - rock interaction has a certain impact on the groundwater chemical evolution. Groundwater chemical evolution in the region's main chemical effects include not only reveals the carbonate mineral dissolution and sulfate minerals, dissolution of silicate minerals also have some impact on groundwater chemical evolution of the Cretaceous, which plagioclase dissolution more obvious.

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CLC: > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Hydrogeology (groundwater hydrology ) > General hydrogeology > Groundwater physical and chemical properties
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