Study of Water-rock Interaction with Hydrochemical and Isotopic Datum in Laizhou Bay

Liu Feng,Ma Fengshan,Guo Jie,Ding Kuo

doi:10.2174/1874123101509010090

Abstract

Water-rock interaction of the groundwater in aquifer system has been analyzed and inferred with hydrochemical and isotopic datum in Laizhou Bay, eastern China. 32 samples of groundwater from three boreholes (96-5#, 96-6#, 112- 1#), couples of seawater, saline water, fresh water, surface water and rainfall are obtained in study area for hydrochemical and isotopic analyses. The origin of groundwater is generally concluded by stable isotope (§18O and §D) and the analytic results of Na+, Ca2+, Mg2+, Cl-, SO2- , HCO3- changing with depth, combined with total dissolved solids (TDS), electrical conductivity (EC), can be apparently proofs for serious water-rock interaction. The conclusion reveals that the origin of 96-5#, 112-1# is most likely saline water different from that the groundwater of 96-6# which is possible originated from fresh water, surface water or mixing of both. Compared the ion content of same borehole at different depth and different boreholes with same depth, the optimal area for building main well and mining area is determined eventually is around 96-5#.

Highlights

A It is significant to understand the mechanism of waterrock interaction in mining area because it greatly changes ion content in the groundwater, reduces the strength of surround-Ding rocks and relates intimately with life and property security, especially in developed and densely populated place
The multivariate statistical analysis, based on geochemical and isotopic datum, is adopted to investigate the water-rock interactions and hydrologic mixing in Northeast Tunisia [6] and it is suggested Jurassic limestone suffered from serious water-rock interactions
This paper provides analytic expression the process of water-rock interaction by applying geochemical and isotopic data

Summary

INTRODUCTION

A It is significant to understand the mechanism of waterrock interaction in mining area because it greatly changes ion content in the groundwater, reduces the strength of surround-. Many more papers on water-rock interaction based on isotopic and hydrochemical. T Groundwater chemical and isotopic compositions which belong to the same origin, influenced severely by water-rock. The multivariate statistical analysis, based on geochemical and isotopic datum, is adopted to investigate the water-rock interactions and hydrologic mixing in Northeast Tunisia [6] and it is suggested Jurassic limestone suffered from serious water-rock interactions. Stable isotopes, such as 18O and 2H (deuterium, D), as the typical characteristics of groundwater had been already used by James R. Bath holds that the chemical conditions and rock properties, which is called water-rock interactions, determine the groundwater quality to a great extent [8]

STUDY AREA AND BACKGROUND SETTING

SAMPLING

Seawater