摘要
通过对河北平原第四系地下水He同位素进行比较分析,根据过剩He(4Heexc)、3He/4He比值、δ3He值分析认为,河北平原第四系地下水He同位素有5个特征:(1)地下水中过剩He浓度沿着地下水的流向而增高;(2)地下水中的过剩He浓度随着地下水埋深加大而增高;(3)满城—沧州剖面上过剩He浓度大于石家庄—衡水剖面上的过剩He浓度;(4)河北平原第四系地下水主要是由大气降水补给的;(5)衡水热水过剩He浓度很高(>674 83×10-8cm3STPg-1),这表明以放射成因He为主,地幔成因的He极少。另外地下水的3He/4He比值、R/Ra、δ3He值是判断氦源的一个灵敏的指示剂。
In this paper, the helium isotopes of groundwater in the Quaternary System in the Hebei Plain are analyzed. According to the“excess helium” ((^(4)He_(exc))), (^(3 )He/(~4He) ) ratios and (δ~3He) value, the helium isotope systematics of Quaternary groundwater in the Hebei Plain shows the following five characteristics: 1concentrations of ^(4)He_(exc) in groundwater increase along the flow direction of groundwater; 2concentrations of ^( 4)Heexc in groundwater increase with the depth of groundwater; 3concentrations of( ^( 4)He_(exc)) of the hydrogeological profile in Mancheng-Cangzhou are higher than those in Shijiazhuang-Hengshui; (4) the Quaternary groundwater in the Hebei Plain is of meteoric origin; (5)the thermal groundwater in Hengshui has a higher concentration of (^(4)He_(exc)) (>674.83×10^(-8) cm^3STPg^(-1)). Radiogenic helium predominates in the groundwater (~3He/~4He) ratios, R/R_a and δ~3He value are sensitive indicators in judgment of the helium source.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2005年第U04期112-116,共5页
Earth Science Frontiers
基金
中国地质调查局地质调查专题研究项目(200320150002)
关键词
氦同位素
第四系地下水
河北平原
helium isotopes
(^(4)He_(exc)
) Quaternary groundwater
Hebei Plain
