In order to understand the formation mechanisms of carbonated springs along Heyuan fault zone

Guangdong Province

comprehensively figure out their formation processes

and provide basic knowleges for their development and management

five groups of carbonated water samples and 18 groups noncarbonated water samples were collected  along the Heyuan fault zone

Guangdong Province

and their hydrochemical characteristics

 δD、δ

18

O、

14

C、δ

13

C and

3

He/

4

He isotopes were analyzed. The results showed that  Na-Ca-HCO

3

is the main water chemistry type for the carbonated spring

and δD and δ

18

O isotopes are between -43.32‰~-41.72‰ and -7.06‰~-6.55‰

respectively. All the dots of groundwater smaples are located close to the atmospheric precipitation line

indicating that carbonated springs receive atmospheric precipitation recharging

and recharge elevation is between 1 000 m~1 300 m. The age of carbonated spring is calculated at 21~26 ka through the

14

C method dating and the revised δ

13

C age correction model. The range of δ

13

C of carbonated springs is between -1‰ and 2‰

with the R/Ra  (the ratio of

3

He/

4

He in samples to

3

He/

4

He in atmosphere) ratio between 0 and 2.5

which indicates that CO

2

gas in carbonated springs in the Heyuan fault zone is the source of mixing between mantle source and metamorphism

and is mainly based on metamorphism.